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• t► � .k '}. <br /> �•, <br /> .�`• z a. <br /> 4 <br /> -} r IR <br /> 441 <br /> Photo 8-1. Photo that shows plan view of northern portion of South Quarry,with circled localized <br /> kinematic failures that are interpreted to have formed on adversely oriented foliations. The crown <br /> of these failures nearly extends to the overlying bench and could feasibly result in a multi-bench <br /> failure. <br /> 8.2 Rock Cut Highwall Performance Monitoring <br /> Recommendations <br /> Monitoring the mine highwalls is a critical step in recognizing and reducing the potential for <br /> both small and large-scale failures. Aggregate Industries currently follows a monitoring plan <br /> for the South Quarry that utilizes control points fixed to concrete-filled 55-gallon drums and <br /> visual monitoring program. This plan should continue to be followed, and GEI recommends <br /> supplementing this plan with an annual program that includes quarry face monitoring by <br /> LiDAR (N, E and El.) scans of the rock face and 55-gallon drum monuments or other laser <br /> scanning method to detect changes in the highwall surface. We do annual LiDAR on Ash <br /> stacks, slag stacks, landfills and tailing dam's surfaces to not annual changes. <br /> 42 <br /> Aggregate Industries—Morrison Quarry GEI Consultants, Inc. <br /> AM-07 Geotechnical Stability Exhibit November 2020 <br />