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4.51 <br /> • Configuration: <br /> Bench Height above El. 7000: 40 ft <br /> 7,700 F Bench Width above El. 7000: 40 ft <br /> Bench Height below El. 7000: 70 ft <br /> Bench Width below El. 7000. 30 ft <br /> 7,500 - - Bench Face Angle: 90' <br /> Intermediate Bench Width: 100 ft <br /> 7,300 - Material Properties: <br /> ' y = 164 pcf <br /> p 7,100 c' = 900 psi = 129,600 psf <br /> cp' = 20' <br /> 00 <br /> Q ,. <br /> 6,900 !-- <br /> Q <br /> y� <br /> Z � <br /> �-' 6,700 - <br /> C <br /> O <br /> +; 6,500 <br /> (a x <br /> N <br /> W 6,300 <br /> i <br /> 6,100 �- <br /> 5,900 <br /> 5,700 - — - - -- - j <br /> -1,200 -700 -200 300 800 1,300 1,800 2,300 <br /> Horizontal Distance (ft) <br /> Notes: <br /> Morrison Quarry Case 1 <br /> 1. The Factor of Safety (FS)value shovvn is for the LCeonsul <br /> critical failure surface. South Quarry Highwall Proposed Benching <br /> Jefferson County, COGEI tants Stability Results <br /> Aggregate Industries June 2017 Figure B-1 <br />