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City of Santa Ana AJob No: 01-3058-002-01-00 <br />.1.-· <br />September 25, 1992 U,og No: 2-2662 <br />Page 20 <br />o Foundations adjacent to downslopes should be <br />located at a depth such that the horizontal setback <br />of the leading edge of the bottoms of footings from <br />the competent face of the slope is 1/2 x slope <br />height, and at least 6 feet. The distance need not <br />exceed 15 feet. <br />0 In the event that cut-fill transitions occur due to <br />uneven topography, embedment depths of footings, <br />modifications to construction plans or for any <br />other reasons,the structural area should be <br />overexcavated and recompacted to a depth of 3 feet <br />below pad grade, and to at least 1 foot below <br />footings: extending to 5 feet beyond the building <br />perimeter.) <br />7.5 Settlements <br />Total and differential settlements due to footing loads <br />are not expected to exceed 1 inch, and 1/2 in. for the <br />anticipated column spacings and loads, respectively. <br />These preliminary estimates have been obtained by <br />analysis, and should be reviewed by the Soil Engineer <br />when foundation plans for the proposed structures are <br />finalized. <br />(The recent regrading did not result in significant <br />surcharge load being applied to the underlying soil, <br />inasmuch as the fill which had been in place previously <br />was overexcavated and recompacted.) <br />7.6 Retaining Structures/Lateral Forces <br />a. The following lateral pressures are recommended for <br />the design of retaining structures with backfill <br />soils of expansivity not higher than Medium. <br />.,f. <br />.-I