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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> <br /> January 2024 | 12 <br />4.2 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 />