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Aggregate Industries, Morrison Quarry <br /> Amendment No.7 to Permit M-1973-021 <br /> Morrison,CO <br /> Exhibit D.3. Observational Approach <br /> Exhibit D.3. Observational Method (applicable to South Quarry mining <br /> operations below El. 6,600) <br /> Mine 40 foot Highwall <br /> Configuration <br /> Perform Geologic Mapping and <br /> Visual Observation <br /> No id evaluation identify favorabl Yes <br /> conditions for steeper bench(max <br /> 40H:60V)configurations? <br /> No Collect Additional Data and Perform <br /> Stability Evaluations <br /> Document. <br /> N <br /> Proceed with 40 foot highwall,40 o oes steeper configuration meet <br /> foot minimum bench width minimum FOS requirements? <br /> configuration <br /> Yes <br /> Document in Technical Revision and <br /> submit to DRMS for approval <br /> Mine to Steeper Configuration <br /> 40H:60V) <br /> Reclamation <br /> October 2021 26 <br />