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Morrison Quarry AM-07 Geotechnical Stability Exhibit <br /> DRMS Permit M-1973-021 <br /> Aggregate Industries WCR Inc. <br /> Sillimanitic Gneiss <br /> The sillimanitic gneiss is evaluated as an independent unit due to its potential to impact the strength of <br /> the rock mass if encountered in large quantities during excavation.The input parameters for global <br /> failures are summarized below, and are shown graphically in the GSI charts on the proceeding pages. <br /> Hoek Brown Classification for Sillimanitic Gneiss-Local Bench Failures <br /> sigci 6.5 ksi <br /> GSI 35 <br /> mi 23 <br /> D 1 <br /> E i 6250 <br /> MR 500 <br /> Hoek Brown Criterion for Sillimanitic Gneiss-Local Bench Failures <br /> mb 0.221 <br /> s 1.97E-05 <br /> a 0.516 <br /> Hoek Brown Classification for Sillimanitic Gneiss-Global Bench Failures <br /> sigci 6.5 ksi <br /> GSI 35 <br /> mi 23 <br /> D 1 <br /> Ei 6250 <br /> MR 500 <br /> Hoek Brown Criterion for Sillimanitic Gneiss-Global Bench Failures <br /> mb 0.2571 <br /> s 0.0007 <br /> a 0.516 <br /> GEI Consultants, Inc. 7 of 25 Appendix CA <br /> November 2020 <br />