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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 /> V <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 I-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:\Bestway-2131nissen\Stabdity\Report\Stability analysis-Nissen Change of Operator.doc <br />