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As shown in Table 5-3, the calculated Q-system values are 1.7 to 16.7, which classifies as a <br /> `Poor' to `Fair' rock mass quality in this classification system. <br /> 5.4 Rock Mass Characterization Summary <br /> The Hoek-Brown Failure Criterion is used to characterize the rock mass at Morrison Quarry, <br /> and is shown in Figure 5-1. The associated Hoek-Brown Criterion values are summarized in <br /> Table 5-4. <br /> Table 5-4. Hoek-Brown Criterion <br /> Hoek-Brown Calculated Value <br /> Rock Mass <br /> Constants Local Bench Failures Global Failures <br /> mb 0.39 3.28 <br /> s 0.000045 0.0013 <br /> a 0.51 0.51 <br /> A comparison of the different rock mass characterization methods from Hoek- Brown <br /> Criteria published in 1988 provides an assessment of different classification methods used at <br /> Morrison Quarry. Results of the RMR and Q-System ratings are consistent with each other <br /> and fall within the same general rock mass classification and description of the rock mass. <br /> The Hoek-Brown Constants developed for the stability evaluation agree with the <br /> recommended values in the summary table provided in the 1988 comparison, which is shown <br /> below in Figure 5-4. <br /> 23 <br /> Aggregate Industries—Morrison Quarry GEI Consultants, Inc. <br /> AM-07 Geotechnical Stability Exhibit November 2020 <br />