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April 16, 2025 Page 8 Project 7.5 Lateral Resistance The following values may be utilized in resisting lateral loads imposed Requirements of the California Building Code should be adhered to wher friction and passive pressures are combined. Coefficient of Friction - 0.40 Equivalent Passive Fluid Pressure = 250 lbs./cu.ft. Maximum Passive Pressure = 2,500 lbs./cu.ft. CITY OF SANTA ANA Planning and Building Agency mber 25129-25 Approved FOR PERMIT ISSUANCE 'Aaster IIIructure. tletcoefficient of The passive pressure recommendations are valid only for approved compacted fill soils or competent native materials. 7.6 Retaining Wall Design Parameters Active earth pressures against retaining walls will be equal to the pressures developed by the following fluid densities. These values are for granular backfill material placed behind the walls at various ground slopes above the walls. Surface Slope of Retained Materials Horizontal to Vertical Equivalent Fluid Density Ib../cuft Level 30 5 to 1 35 4 to 1 38 3 to 1 40 2 to 1 45 Any applicable short-term construction surcharges and seismic forces should be added to the above lateral pressure values. An equivalent fluid pressure of 45 pcf may be utilized for the restrained wall condition with a level grade behind the wall. The seismic -induced lateral soil pressure for walls greater than 6 feet may be computed using a triangular pressure distribution with the maximum value at the top of the wall. The maximum lateral pressure of (20 pcf) H where H is the height of the retained soils above the wall footing should be used in final design of retaining walls. Sliding resistance values and passive fluid pressure values may be increased by 1/3 during short-term wind and seismic loading conditions. NorCal Engineering