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City of Santa Ana - Job No: 01-3058-002201-00 <br />September 25, 1992 Log No: 2-2662 <br />Page 17 <br />of granular base should be provided with soils of Medium <br />and High expansivity, and 2 inches of granular base with <br />subgrade soils of Low expansivity.(Aggregate base is <br />recommended to be used where the thickness of the base <br />layer is greater than 2 inches.)The base is separate <br />from the sand layer recommended in b. above. <br />f. Minimum steel should be provided in slabs-on-grade, as <br />follows: <br />With Very High expansivity soil - <br />4x4-W4xW4 WWF <br />With Medium to High expansivity soil - <br />6x6-W2.9xW2.9 WWF <br />With less expansive soil - 6x6-Wl.4xWl.4 WWF <br />(Note: Though the expansivity of the soils in the upper <br />layer has been rated Very Low, recommendations for soils <br />of higher expansivities have been provided as a <br />contingency measure.) <br />7.4 Foundations <br />The proposed structures of the type anticipated, can be <br />founded on shallow spread footings.The criteria <br />presented below should be adopted: <br />4- <br />--