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k'q KLEINFELDER <br /> File No.: 20-3121-02 <br /> November 2, 1988 <br /> Page 7 <br /> Lateral Forces <br /> Resistance to lateral forces can be provided either by friction between the base of <br /> the foundation and the soil, or by passive pressure of the sides of the footings against <br /> a the soil. The recommended friction factor is 0.4. The recommended passive soil <br /> pressure is an equivalent fluid pressure of 350 pounds per square foot per foot of <br /> depth. <br /> Floor Slabs <br /> We recommend that floor slabs be underlain by a minimum of 6 inches of recompacted <br /> existing soil, Tree of debris, or Engineered Fill. The recommended minimum degree of <br /> compaction is 90 percent of the maximum dry density as obtained from the ASTM <br /> _ D-1557 test procedure at a moisture content near optimum. In our opinion, a capillary <br /> moisture break such as provided by a layer of gravel beneath floor slabs, can be <br />. , <br /> omitted due to the sandy nature of the on-site soils. In areas to receive moisture- <br /> sensitive floor coverings, we recommend that the subgrade soils be covered by a <br /> moistureprooting membrane such as ''.Vloiststop," or equivalent, to act as a vapor <br /> barrier. Care should be exercised to avoid tearing, ripping, or displacing the <br /> membrane during construction. If the membrane becomes torn or disturbed, it should <br /> be removed and patched, or thoroughly replaced. The membrane should, in turn, be <br /> covered with approximately 1 inch of moist sand to protect it during construction and <br /> aid in curing the concrete. <br /> We recommend that floor slabs be a minimum of 4 inches in thickness and reinforced <br /> with at least wire mesh placed at midpoint in the slab. If heavy storage or equipment <br />