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k" KLEINFELDER <br /> File No. 20-2182-24 <br /> February 20, 1990 <br /> reinforcing steel . The purpose of these observations is to confirm <br /> that the exposed soils are the same as those on which our <br /> recommendations are based and to observe for any soft pockets of <br /> soil or debris . <br /> For the assumed building loads, the total settlement is not <br /> expected to exceed 1/4- to 1/2-inch with the structures supported <br /> on the existing soils . Differential settlement can be assumed to <br /> be approximately one half these values . Most of the settlement is <br /> expected to occur during the construction period shortly after the <br /> loads are applied, provided the foundations are not exposed to <br /> sustained standing water or flooding. <br /> Lateral Pressures <br /> Resistance to lateral forces can be provided either by friction <br /> between the base of the foundations and the soil or by passive <br /> pressure of the sides of the foundations against the soil . The <br /> recommended passive soil pressure is an equivalent fluid pressure <br /> of 350 pounds per square foot per foot of depth. The recommended <br /> coefficient of friction is 0 . 4 . <br /> Slab-On-Grade Floors <br /> We recommend that in order to reduce the risk of heaving, the <br /> clayey soils beneath slab-on-grade floors be moisture conditioned <br /> to a depth of at least 18 inches to a moisture content between 3 <br /> to 5 percent over optimum. In addition, consideration should be <br /> given to moisture conditioning the clayey soils beneath exterior <br /> 7 <br />