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TABLE 4.CONTINUOUS FOOTING BEARING CAPACITY <br /> Effective Width,B' Bearing Capacity for Continuous Footing(ksf) <br /> (feet) Extreme Strength Service(1-inch Deflection) Service(2-inch Deflection) <br /> 4.0 4.7 2.3 3.8 7.5 <br /> 5.0 5.5 2.7 3.4 6.7 <br /> 6.0 6.3 3.1 3.1 6.1 <br /> 7.0 7.1 3.5 2.7 5.5 <br /> 8.0 7.8 3.9 2.5 5.0 <br /> 9.0 8.6 4.3 2.3 4.6 <br /> 10.0 9.4 4.7 2.1 4.3 <br /> 11.0 10.1 5.1 2.0 4.0 <br /> 12.0 10.8 5.4 1.9 3.8 <br /> Notes: <br /> 1.If unsuitable soils are encountered at the footing subgrade elevation they must be removed and replaced with adequately <br /> compacted structural fill,lean concrete or controlled density fill. <br /> 2.Bearing capacities are for effective lengths and widths and should be corrected for eccentric loading conditions. <br /> ksf-kips per square foot <br /> We recommend the lateral earth pressures in Table 5 be utilized for preliminary design.These parameters <br /> were developed per AASHTO LRFD Bridge Design Manual and the GDM. <br /> TABLE 5. LATERAL EARTH PRESSURES AND SOIL PARAMETERS FOR WALL 1 AND WALL 2 <br /> Parameter Value <br /> Backfill Soil Unit Weight,'y 130 pcf <br /> Backfill Soil Friction Angle,4) 35° <br /> Active Earth Pressure Coefficient, Ka- Level Backslope 0.25 <br /> Active Earth Pressure 1- Level Backslope 33 pcf <br /> Active Earth Pressure Coefficient, Ka- 2H:1V Backslope 0.37 <br /> Active Earth Pressure'- 2H:1V Backslope 50 pcf <br /> Wall Foundation Coefficient of Sliding- Unfactored 0.50 <br /> Traffic Surcharge Lateral Pressure 2 65 psf <br /> Seismic Earth Pressure Coefficient, Ke - Level Backslope 0.15 <br /> Seismic Earth Pressure 1,3- Level Backslope 9 pcf <br /> Seismic Earth Pressure Coefficient, Ke- 2H:1V Backslope 0.6 <br /> Seismic Earth Pressure 1,3- Level 2H:1V Backslope 27 pcf <br /> Passive Earth Pressure Coefficient, Kp - Level Foreslope 325 <br /> Passive Earth Pressure 1- Unfactored - Level Foreslope 425 <br /> Notes: <br /> 1 Equivalent Fluid Density-triangular pressure distribution <br /> 2 Rectangular pressure distribution <br /> 3 Active earth pressure and traffic surcharge should be added to the seismic earth pressure using appropriate load factors for <br /> extreme limit state. <br /> The seismic earth pressures are based on the Mononobe-Okabe method recommended in Section 15.4.29 <br /> of the WSDOT GDM. <br /> GEOENGINEERSI April 14,2017 Page 15 <br /> File No.2095-032-00 <br />