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kn KLEI NFELDER <br /> File No. 20-2182-24 <br /> February 20, 1990 <br /> not flooded, just prior to placing the concrete in order to aid in <br /> its curing. <br /> We recommend that floor slabs be a minimum of 4 inches in thickness <br /> and be reinforced with at least wire mesh. The mesh should be <br /> pulled up into the center of the slabs during placement of the <br /> concrete if spacer blocks are not provided. The actual floor slab <br /> thickness and reinforcement design should be provided by the <br /> structural engineer. <br /> Site Preparation and Grading <br /> Site preparation should include stripping and removal of vegetation <br /> and debris from the areas of construction. The stripped vegetation <br /> and debris should not be incorporated in any of the structural <br /> fills . The actual depth of stripping should be evaluated in the <br /> field by a representative of Kleinfelder, Inc. Voids left by the <br /> removal of any buried objects should be cleaned of all loose soils <br /> and debris and be properly backfilled with Engineered Fill as <br /> described below. <br /> Depending on the finished site grades and method of floor slab <br /> support, it may be necessary to overexcavate some of the existing <br /> soils to provide for Engineered Fill beneath floor slabs . We <br /> recommend the overexcavation for Engineered Fill beneath floor <br /> slabs extend a minimum of 5 feet beyond all building areas . After <br /> excavation is complete and before any fill is placed, we recommend <br /> that the exposed soil be scarified to a minimum depth of 6 inches <br /> 9 <br />