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Geotechnical Stability Exhibit ��� <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> The North Quarry is mostly reclaimed, with the exception of the 10.6 acre North Repository <br /> Area, and currently holds water used for mining operations and raw water storage for the Town <br /> of Morrison. The North Quarry was mined to an approximate bottom elevation of 6,220' above <br /> mean sea level (MSL) utilizing highwalls and benches at a nominal 1 H(Horizontal):1 V(Vertical). <br /> Reclamation was completed in 2016 for the Central Quarry, and the area is currently utilized for <br /> stockpiling material, as well as storing, maintaining, and repairing mining equipment. The area <br /> was mined to approximately El. 6,330' utilizing highwalls and benches at a nominal 1 H:1 V, with <br /> highwalls to the north and south. <br /> The South Quarry is actively being mined between approximately El. 6,800' and 6,500' using <br /> benches and highwalls. For purposes of this analysis, the anticipated final bottom of pit for the <br /> South Quarry is expected to be El. 6,200'. <br /> May 2023 1 5 <br />