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Job No. 123116-000 Page 1 <br /> Client RMR Aggregates,Inc. Date 1 1/2 712 023 <br /> Project Mid Continent Mine Designed By KRF <br /> Subject Active Slope Stabilization Checked By BZ <br /> Technical Summary <br /> Scope <br /> Preliminary design of active stabilization of the Mid Continent Mine utilizing tensioned tiebacks. <br /> Anchored slope design was performed for upper limestone thicknesses of 10 feetfor static and seismic <br /> conditions. <br /> Design References <br /> • Rock Slope Engineering 4th edition,Wyllie and Mah;2005 <br /> • PTI DC35.1-14,Recommendations for prestressed rock and soil anchors,2014. <br /> • Soil Nails Reference Manual,FHWA GEC 007,Federal Highway Publication No. <br /> FHWA-NH I-14-007. <br /> • Structure Repsonse and Damage Produced by Ground Vibration from Surface Mine Blasting,US <br /> Department of Interior. <br /> Design Assumptions <br /> 1. Rock parameters were assumed from aback analysis of the west wall ground disturbance <br /> performed in RocPlane. <br /> 2. Existing west face slope angles were determined from a slope angle heat map from❑nXmaps. <br /> 3. Empricial strength values used due to decrease in cohesion during possible sliding(conservative) <br />