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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> HDR-004 7/12/2022 1652890.9 3083419.058 6596.5 401.0 <br /> HDR-005 7/20/2022 1653579.696 3083657.069 6648.2 401.0 <br /> Geophysical Evaluations <br /> Upon completion of the geotechnical borings, each boring was then evaluated utilizing a <br /> downhole geophysical array including acoustic televiewer, a 3-arm caliper, magnetic field, and <br /> gravity sensors. The geophysical evaluation was performed by Colog, Inc., of Lakewood, CO, <br /> with the oversight of HDR personnel. The results were provided to HDR, and have been <br /> incorporated into the development of the geologic conditions encountered in the borings. The <br /> televiewer logs and fracture diagrams are included in Appendix A, Subsurface Exploration <br /> Findings. <br /> May 2023 1 9 <br />