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AFS Response to DRMS Adequacy Review#2 September 14, 2021 <br /> • Please have Walstrum confirm the angle used for the low strength rock in the sensitivity <br /> analyses that result in the factors of safety provided in Table S of the Exhibit. <br /> AFS Response: The Division correctly identified an error in Table 5, which also occurs in <br /> Appendix I. Using a hypothetical material with slope of 35 degrees in the sensitivity analysis, the <br /> resulting Factors of Safety are 1.15 for 10-ft-thick Xb and 0.95 for 20-ft-thick Xb. See <br /> Attachment 5 for the updated page 31 of 35 with corrected Table 5 (Geotechnical Stability <br /> Exhibit). See Attachment 6 for the updated page 4 of 8 with corrected Figures 7 and 8 <br /> (Geotechnical Stability Exhibit, Appendix I). <br /> If you have any questions,please contact me at 303-913-6583. <br /> Sincerely, <br /> ya 13s� <br /> Joel Bolduc <br /> Land and Environment Manager <br /> Encl: <br /> Attachment 1 —Exhibit D Mining Plan (revised 9/14/2021) <br /> Attachment 2—Exhibit E Reclamation Plan (revised 9/14/2021) <br /> Attachment 3 —Exhibit R Receipt of Proof of Filing (revised 9/15/2021) <br /> Attachment 4—Cross-Section of Proposed Fines Stockpile Area <br /> Attachment 5 —Geotechnical Stability Exhibit page 31 of 35 (revised 9/14/2021) <br /> Attachment 6—Geotechnical Stability Exhibit Appendix I page 4 of 8 (revised 9/14/2021) <br /> Attachment 7—Evaluation of Mining Methods Walstrum Quarry, Revey, 2002 <br /> Page 3 of 3 <br />