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Page 5 of 6 <br /> Response to Comments from March 6, 2024, DRMS Memorandum April 26, 2024 <br /> Table 4: Upper Wall Factor of Safety against Overturning <br /> Results Units <br /> Overturning Moment Mo= 195.5 ft-lb/ft <br /> Resisting Moment Mr= 2964.4 ft*lb/ft <br /> Factor of Safety Overturning FSoT= 15.2 <br /> Table 5: Lower Wall Input Variables <br /> Variable Symbol <br /> Lower Tier Offset X= 2 ft <br /> Lower Tier Wall Height H= 9 ft <br /> Lower Tier Top Wall Thickness Bt= 3 ft <br /> ve rt : 1 <br /> Lower Tier Front Face Slope Sff= 1.1 horiz <br /> ve rt : 1 <br /> Lower Tier Back Face Slope Sbf= -1.1 horiz <br /> Lower Tier Wall Embedment Depth d= 3 ft <br /> Lower Tier Bottom Wall Thickness Bb = 3.00 ft <br /> Surcharge from Upper Tier q= 638.07 psf <br /> Lower Tier Allowable Bearing Pressure Qa= 2000 psf <br /> Lower Tier Soil Friction Angle = 34 deg <br /> Lower Tier Soil Cohesion c= 0 Psf <br /> Lower Tier Soil Backslo e Angle a = 18.43 de <br /> Lower Tier Soil Unit Weight Yr= 125 pcf <br /> Boulder Unit Weight yb = 150 pcf <br /> Void Ratio V= 3% <br /> Boulder Wall Net Unit Weight yW= 145.5 pcf <br /> Lower Tier Wall Backface Batter (3 = 41 deg <br /> Lower Tier Angle of Wall Friction 8 = 23 deg <br /> Table 6: Lower Wall Overturning Moment <br /> r Results Units <br /> Active Pressure Pa= 214.8 lb/ft <br /> Horizontal Active Pressure Ph = 203.6 lb/ft <br /> Surcharge PS 784.2 lb/ft <br /> Vertical Active Pressure Pv= -68.6 lb/ft <br /> Overturning Moment Mc,= 4531.2 ft*lb/ft <br /> o:Iproject120100120119b105 documentslworking fileslwnrlwall design120119b poudre ponds wall design memo 2024-04-26.docx <br />