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Mr. Jeremy Dueto <br /> February 2, 2021 <br /> Page 4 <br /> CONCLUSIONS <br /> Based on the Factors of Safety listed in the table above,the 3H;1V mine slope meets Factor of Safety Requirements for <br /> reservoir construction as required be a hazard the State Engineer, Dam Safety Branch for the section analyzed. The <br /> temporary 2H:1 V slopes in the silt pond meet standards commonly practiced in the area. <br /> LIMITATIONS <br /> Our review is based on regional geologic mapping,the mining plans presented by Al, and in part subsurface data <br /> provided by others. Stability analyses were performed using typical strength parameters for the various strata in the <br /> critical section. Should the mining plans change or subsurface conditions vary from those portrayed in this letter,we <br /> should be contacted in order to re-evaluate the potential effects on stability. Note 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:XSTABL Model Outputs <br /> REFERENCES <br /> Braddock,W.A.and Cole,J.C.; 1978; "Prelimijary Geologic Map of the Greeley 1 x 2 Degree Quadrangle, Colorado and <br /> Wyoming"; Open File Report 78-532. <br /> Colton, R. B., 1978; "Geologic Map of the Boulder-Fort Collins-Greeley Area, Colorado"; Miscellaneous Investigations <br /> Series, Map 1-855-G. <br /> JAggregate Industnes-2971Confidenfial ProjedStability analysis report-Al.doc <br />