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�. H. KI.FINFFI.DER h ASSOCIATES File No. S-2314-1 <br /> August 15 , 1978 <br /> 7 PAGE EIGHT <br /> Lateral Earth Pressures <br /> Resistance to lateral forces can be provided either <br /> J by friction between the base of the footings and the soil <br /> or by passive pressure on the sides of the footings against <br /> the soil. The recommended passive soil pressure is an <br /> equivalent fluid pressure of 350 pounds per square foot <br /> per foot of depth. The recommended coefficient of friction <br /> is 0. 35 . <br /> Slab-On-Grade Floors <br /> It is our opinion that slab-on-grade floors can <br /> be used on this project provided that the moisture <br /> content of the native clay soils is reestablished to a <br /> Jminimum depth of 18 inches to at least 5 percent over <br /> the optimum soil moisture content. Our detailed recommendations <br /> jfor the placement of Engineered Fill and the preparation of <br /> I the native soils are contained in the "Site Preparation and <br /> 1 Grading" section of this report. <br /> We recommend that floor slabs be a minimum of 4 inches <br /> in thickness and reinforced with at least wire mesh reinforcing. <br /> 1 If floor slabs are to receive moisture sensitive covering, we <br /> recommend that floor slabs be underlain by a minimum 4-inch <br /> thick layer of free-draining gravel to act as a capillary moisture <br /> break. The gravel should be covered with a moistureproofing <br /> membrane such as "Moiststop" or equivalent to act as a vapor <br /> barrier. The membrane should then be covered with approximately <br /> 1 to 2 inches of moist sand to help protect the membrane during <br /> construction and aid in curing the concrete. <br /> Site Preparation and Grading <br /> Site preparation should include stripping of all <br /> vegetation and removing all debris from areas of construction. <br /> IThe recommended minimum depth of stripping is 2 inches . <br /> J <br />