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Geotechnical Stability Exhibit ��� <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> values are comparable to those utilized by GEI in their previous stability design and analyses. <br /> This comparison indicates a consistent trend in the distribution of very hard quartz and quartz- <br /> like material, hard biotite gneiss of varying mineral assemblages, and veins or regions of heavily <br /> fractured and/or altered soft material such as talc, chlorite, and intermixed sedimentary material. <br /> 30000 <br /> a <br /> S, s9000 - <br /> d <br /> 22 <br /> [A • <br /> v <br /> -y 10" • 12 <br /> N <br /> Q1 • Ir <br /> a 31 <br /> � 24 • <br /> U 15" • � <br /> a <br /> c 11 35 <br /> C 10 • • <br /> �00 52 3 • 2 8 21 <br /> • • • 25 • 33 34 <br /> 7f • <br /> • • 9 •a if, 17 19 • 29 • • <br /> a yg . an <br /> 90W • 8 • 13 • • * • 75 • <br /> • <br /> • Is <br /> 0 <br /> 15 zc 3o ao <br /> Sample Number <br /> Figure 7: Scatter Plot of Laboratory Tested UCS Values and Categories for Design <br /> 5.2.1.2 Design GSI Value <br /> Design GSI values were based on field evaluations by HDR geologists of exposed typical <br /> competent and talc-gneiss material within the quarry. GSI values are inherently variable by <br /> definition, and the existing variability of a metamorphic environment suggests that the <br /> recommended GSI values may differ from location to location. A holistic view of the geologic <br /> conditions at the site were considered in developing the recommended GSI values. An example <br /> of a typical exposed rock face for competent material is presented in Figure 8 and an example <br /> of a typical exposed rock face for talc-gneiss material is presented in Figure 9. <br /> May 2023 1 22 <br />