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Job No. 123116-DOO Page 6 <br /> Client RMR Aggregates,Inc. Date 11/27/2023 <br /> Project Mid Continent Mine Designed By KRF <br /> Subject Active Slope Stabilization Checked By BZ <br /> Slope Stability support-Seismic <br /> x highwall height- I H:= 25 <br /> Peak ground acceleration coefficient (1000-yr retum)- PGA:= 0,196 AASHTC Fig.3.10.2.1-1 <br /> Horizontal Response Spectral Acceleration coefficient- S 1 := 0.082 AASHTC Fig.3.10.2.1-3 <br /> Thickness of limestone layer- d1 := 90.ft <br /> Thickness of shale layer- d2 := 0.5'ft <br /> Thickness of dolomite layer- d3 := 100-ft—d1 —d2 =9.5 ft <br /> Average blow counts in ground layer one- N1 := 100 <br /> Average blow counts in ground layer two- N2 := 50 <br /> Average blow counts in ground layer three- N3 := 100 <br /> d1 + d2 + d3 <br /> Average SPT over top 100 ft- Nbar = 100 Eq.4.2 <br /> d1 d2 d3 <br /> 1 2 N3 <br /> Site Class=A,Hard rock Table 4.8 <br /> Site adjustment factors- Fpga:= 0.8 Table 4.9 <br /> FV- 0.8 Table 4.10 <br /> Design peak ground accleration- PGAD:= Fpga•PGA=0.16 Eq.4.3 <br /> Design site-corrected response acceleration- SID:= Tv;Si =0.07 Eq.4.4 <br /> Seismic Zone- <br /> S7 "Seismic Zone 1" if SID:�0.15 ="Seismic Zone V <br /> 6.$.1 <br /> "Seismic Zone 2" if S 1D a 0.15 A S 1 D 5 0.30 <br /> "Seismic Zone 3" if S 1D>0.30 A S 1 D 5 0.50 <br /> "Seismic Zone 4+" otherwise <br />