Laserfiche WebLink
CITY OF SANTA ANA <br />Planning and Building Agency <br />Mr. Amir Houriani <br />Project No. 32-6235-00 <br />1601-1607N. Bristol Street <br />August 29, 2022 <br />FOUNDATION DESIGN <br />Type of Foundation <br />PageApproved <br />FOR PERMIT ISSUANCE <br />Master ID: <br />Date: <br />The proposed building may be supported on conventional foundations bearing on newly <br />compacted fill. It is recommended that all continuous and isolated footings be embedded at least <br />24 inches below lowest adjacent grade. Continuous and isolated footings should be designed <br />with a minimum width of 18 inches and 24 inches, respectively. The minimum reinforcement in <br />continuous footings should consist of four No. 4 bars: two placed about four inches from the top <br />and two placed about four inches from the bottom. Reinforcement for isolated footings should be <br />designed by the project structural engineer. <br />Soil Bearing Pressure <br />Conventional foundations founded on compacted fill may be designed for an allowable soil <br />bearing pressure of 3,500 pounds per square foot (psf). The allowable bearing pressure may be <br />increased by 200psf and 500psf for each additional foot of foundation width and depth, <br />respectively, up to a maximum allowable bearing pressure of 5,000psf. A factor of safety of 3 <br />was utilized in determining the allowable bearing pressures. The bearing pressures indicated are <br />for the total of dead and frequently applied live loads and may be increased by one third for short <br />duration loading, which includes the effects of wind or seismic forces. <br />Settlement <br />The settlement of a structure will depend on the actual footing dimensions and the imposed <br />vertical loads. Based on the allowable soil bearing pressures presented above, the total static <br />settlement of the recommended conventional foundations bearing in newly compacted fill is not <br />expected to exceed 0.50 inch. Differential settlement is not expected to exceed 0.25 inch in a 30- <br />foot span. The total and differential seismically induced settlements for the 475-year design <br />event were calculated to be 0.50 and 0.33 inches, respectively. The cumulative effects of static <br />and seismic loading may yield a total settlement of 1.0 inches and differential settlement of 0.6 <br />inches. As a result, the overall anticipated settlements are considered acceptable for the <br />recommended conventional foundations. <br />SLABS -ON -GRADE <br />Concrete floor slabs -on -grade thickness and reinforcement should reflect the anticipated use of the slabs <br />and should be designed by the structural engineer. Concrete floor slabs -on -grade should be a minimum <br />of four inches (full) thick with minimum reinforcement consisting of No. 4 deformed bars spaced a <br />maximum of 16 inches each way. Concrete slabs -on -grade should be underlain by four inches of % inch <br />or larger clean aggregate base. In areas where floor coverings or equipment that are sensitive to <br />moisture are contemplated a 10-mil moisture barrier membrane (e.g. Visqueen) should be placed on the <br />granular base in direct contact with the concrete slab. <br />n �� A.G.I. Geotechnical, Inc. • 16555 Sherman Way, Suite A • Van Nuys, CA 91406 <br />Z-" Office: (818)785-5244 • Facsimile: (818)785-6251 <br />