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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 | 9 <br /> <br />Table 1 – Summary of 2022 Borings <br />Boring Completion <br />Date Northing Easting Approximate <br />Elevation (ft.) <br />Total <br />Depth <br />(ft.) <br />HDR-002 7/12/2022 1653224.052 3083166.334 6602.3 380.2 <br />HDR-003 7/20/2022 1653191.774 3082950.6 6604.5 391.0 <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 /> <br />3.2.1 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 />