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,project No. JB-569 20 June 2006 Page 10 Table 3 FOUNDATION DESIGN CRITERIA CONTINUOUS STRIP AND ISOLATED FOOTINGS Item Criteria Width: Wall Footings (Continuous) Column Footings (Isolated) Embedment Depth' Engineered Fill Allowable Bearing CapacityZ Engineered Fill Coefficient of Sliding Friction Minimum 12 inches Minimum 24 inches Minimum 18 inches 2,500 psf 0.35 1. Footing embedment depth is measured from the lowest adjacent soil grade to the bottom of the footing. 2. The recommendations above are for a foundation designed for net dead plus live loads. These bearing pressures may be increased by one-third for wind or seismic loads. 6.3 Lateral Load Design Criteria Lateral loads may be resisted by soil friction and by the passive resistance of the soils. For engineered fill or native soil, we recommend the following lateral load design criteria: Coefficient of Friction .............................. 0.35 . Passive Pressure .............................. 350 psf/ft The passive pressure and the frictional resistance of the soils may be combined without reduction in determining the total lateral resistance. These values are ultimate and an appropriate factor of safety should be applied by the structural engineer. 6.4 Retaining Walls Cantilevered retaining walls (unrestrained), above water, without surcharge, may be designed assuming the soils will impose a pressure equal to that developed by a fluid with a density of: . Horizontal/Flat Backfill ............................. 40 psf/ft 2H:1V ........................................ 60 psf/ft Any surcharge from adjacent loadings should be added to this pressure using a factor of 0.30. Our recommendations assume a fully drained condition, therefore, we recommend that a drainage blanket system be provided. We also recommend that the structural fill placed behind the retaining wall be granular, if possible. If ~Korbmacher Engineering, Inc.