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City of Santa Ana Job No: 01-3058-002-01-00 <br />September 25, 1992 1 Log No: 2-2662 <br />Page 16 <br />7.3 Slabs-On-Grade <br />a.Concrete floor slabs · may be : founded on the existing <br />compacted fill soils.The' subgrade should be proof- <br />rolled just prior to construction to provide a firm, <br />relatively unyielding surface, especially if the surface <br />has been loosened by the passage of construction traffic. <br />b. If a floor covering that would be critically affected by <br />moisture is to be used, a 10-mil plastic vapor barrier is <br />recommended.This sheeting should be covered with 2 <br />inches of sand. <br />C.The subgrade should be presoaked as follows; <br />With Very High and <br />High expansivity soil -5 percentage points above <br />optimum, or to 125% of <br />optimum,whichever is <br />greater; to 2 feet depth. <br />With Medium expansivity <br />soil -5 percentage points above <br />optimum, or to 125% of optimum, <br />whichever is greater; to 1.5 <br />feet depth <br />With Low expansivity <br />soil -4 percentage points above <br />optimum, or to 120% optimum, <br />whichever is greater; to 1 foot <br />depth <br />d. Slabs should be at least 4 inches thick (nominal). <br />Joints should be provided per usual practice. <br />e. Slabs should be underlain by 6 inches of granular base, <br />with subgrade soils of Very High Expansivity.4 inches <br />.-I <br />.-I.-- <br />-.