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Project No. JB-569 <br />20 June 2006 <br />Revised 18 October 2006 <br />Page 12 <br />6.3 Lateral Load Design Criteria <br />Lateral loads may be resisted by soil friction and by the passive resistance of the <br />soils. For engineered fill or native soil, we recommend the following lateral load <br />design criteria: <br />• Coefficient of Friction .............................. 0.35 <br />• Passive Pressure .............................. 350 psf/ft <br />The passive pressure and the frictional resistance of the soils may be combined <br />without reduction in determining the total lateral resistance. These values are <br />ultimate and an appropriate factor of safety should be applied by the structural <br />engineer. <br />6.4 Retaining Walls <br />Cantilevered retaining walls (unrestrained-, above water, without surcharge, may <br />be designed assuming the soils will impose a pressure equal to that developed by <br />a fluid with a density of: <br />• Horizontal/Flat Backfill ............................. 40 psf/ft <br />2H:1V ........................................ 60 psf/ft <br />Braced or restrained retaining walls, such as basement walls, should be designed <br />to resist the earth pressure distribution as shown in the figure below. <br /> <br />Any surcharge from adjacent loadings should be added to this pressure using a <br />factor of 0.30. Our recommendations assume a fully drained condition, therefore, <br />we recommend that a drainage blanket system be provided. We also recommend <br />Korbmacher Engineering, Inc. <br />.. <br />