11830 19TH AVE SE 2016-01-01 MF Import

Seahorse Restaurant W-5583 18 March 1988 Page 8 Foundation Considerations The proposed structures may be supported on conventional spread footings. The footings may be constructed on either undisturbed, dense to very dense glacial soils, the upper medium dense weathered gla�ial soils or post-glacial soils, or I adequately compacted structural fill placed above suitable native deposits. All footings should have a minimum width of 12 inches for single-story, or 15 inches for two-stories. The base of exterior footings should be located at least 18 inches below the lowest adjacent ground surface of the top of floor slab, whichever is lower. Interior footings need only extend 12 inches below surrounding grade or slab surface. We recommend that footings founded in the dense to very dense I unweathered glacial soils be designed with a maximum allowable soil �earing pressure , of 4500 pounds per square foot (psf). If the footings are founded in the upper medium dense weathered glacial sails or post-glacial soils or structural fill piaced above suitable subgrade, a maximum allowable soil bearing pressure of 2500 psf may be used. The foundation elements are founded in the combination o` the dense to very dense glacial soils and either the upper medium dense soils or properly compacted fill , the lower allowable soil bearing pressure should be utilized for design to minimize � potential differential settlements and allow s9mplified design and construction. These allowable bearing pressures may be increased by up to one-third to accommodate seismic and transient loacls. All footings must be founded in the prescribed bearing stratum; the foundation should not be set in or above loose or disturbed soils or any er.isting uncontrolled or uncompacted fill . As the site soils are silty, site work in the presence of water or during wet weather may disturb the bearing strata. The contractor should avoid disturbance of the bearing soils and limit traffic, across the prepared building pad or foundation area during wet weather. To minimize disturbance associated with foundation form work and reinforcement bar placement, the use of a "mud mat" or quarry spall working blanket may be required.