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St. Barbara Catholic School Project No.: D-6289-01 The basic bearing value may be increased 250 pounds per square increase of embedment to maximum of 3,000 pounds per square foot. Recommended bearing values are for dead plus live loads and may be third for the combined dead, live, wind load, and seismic forces. CITY OF SANTA ANA Planning and Building Agency may, lS. Approved FOR PERMIT ISSUANCE for each foot Master ID: Date: one - Continuous footings should be incorporated with 2#5 bars at the top and 245 bars at the bottom. Total static settlement would be ''/Z" and differential settlements would be 1/4 inch maximum in the span of 30 feet. Other aspects of the design, including minimum reinforcement, footing embedment, additional posts and beams, and the need for interior footings, are to be determined by the project structural engineer. (b) Mat Footing Alternative foundation would be the semi -rigid mat foundation including basement. The minimum thickness for the semi -rigid mat foundation should be 18 inches overlying a moisture protective barrier layer of Stego Wrap (15 mil or equivalent) over 12 inches of 3/4-inch crushed rock subjected to several passes with a walk -behind vibratory compactor and at least 12-inches thick subgrade should be compacted to minimum 90% of the ASTM D-1557 laboratory test standard, certified by the Geotechnical of the Record prior to pouring concrete. The semi -rigid mat footing may be designed for an allowable bearing capacity of 1,500 pounds per square foot. This basic allowable bearing value is for dead load plus live load and may be increased by one-third for short duration loading, such as wind or seismic forces. Modulus of subgrade reaction, k value may be taken as 100 pci at the surface and 150 pci at 2 feet depth for the subgrade layer of soil. For lateral support, an average passive capacity of 300 pounds per square foot to a maximum of 4,500 psf may be used for mat footing. 15