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Mr. Mark Johnson <br /> June 17, 2019 <br /> Page 4 <br /> LIMITATIONS <br /> Our review is based on regional geologic mapping, present mining plans,and in part borehole data by Tetra Tech. Civil <br /> Resources is not responsible for work by others. Stability analyses were performed using typical strength parameters for <br /> the various strata in the critical section discussed above. Should the mining plans change or subsurface conditions vary <br /> from those portrayed in this letter,we should be contacted in order to re-evaluate the potential affects on permanent <br /> man-made structures. Stability analyses were run at the structure in question and were not run on failure surfaces closer <br /> to the highwall. Note also that surcharge loads due to temporary material stockpiles and overburden/topsoil berms were <br /> not considered in the analysis. <br /> Please call with any questions or comments. <br /> Sincerely, <br /> Civil Resources, LLC <br /> 5 <br /> Gary Linden, P.G. <br /> Senior Engineering Geologist <br /> Attachments: Figure —Bernhardt Mine Plan <br /> XSTABL Model Outputs <br /> REFERENCES <br /> Colton, R.B., 1978,"Geologic Map of the Boulder-Fort Collins-Greeley Area, Colorado", U.S.G.S. Map 1-855-G. <br /> Tetra Ech, 2002, "Stability Analysis, Bernhardt Mine",2 <br /> JABestway-2131bernhardt0RMS Permit update\Stability\Stability analysis report-Bernardt update doc <br />