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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> Recent Testing <br /> HDR contracted with Advanced Terra Testing, Inc., of Lakewood, CO, to perform rock strength <br /> and aggregate testing for the project, and DRP, Inc. of Boulder, CO to perform petrographic <br /> analyses. Refer to the sections below for a summary of the performed testing and refer to <br /> Appendix A, Subsurface Exploration Findings, for the results. <br /> 4.2.1 Recent Strength Testing <br /> A total of 28 UCS tests including the elastic modulus were performed in accordance with ASTM <br /> D7012-14, Method D. Testing was performed on varying lithologies in order to develop an <br /> understanding the of the rock strength to be utilized in design. Refer to Table 4 below for a <br /> summary of the testing results. <br /> May 2023 1 12 <br />