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December 30th, 2021 G-5593 <br /> 4730—Seahurst Ave,Washington 98203 Page 5 <br /> Foundations <br /> Soils near the proposed garage that are anticipated to be acceptable for building support were <br /> encountered at a depth of approximately 2 to 3 feet below surface grade throughout the proposed <br /> development area at the project. Therefore, anticipated depth to the bottom of footings for the <br /> proposed addition are approximately 2 to 3 bgs. Our recommendations regarding conventional <br /> "footing support are presented below. <br /> Conventional strip and column footings should bear directly on undisturbed, dense to very dense <br /> native soils or 1-to 2-inch crushed rock directly underlain with dense to very dense native soils. <br /> Our recommended design criteria for conventional footing foundations are provided below. <br /> -Allowable bearing pressure, including all dead and live loads: <br /> Undisturbed, dense or very dense soil =2,500 psf <br /> Crushed rock underlain with dense or very dense soil =2,500 psf , <br /> -Minimum depth to bottom of interior footings below top of floor slab= 12 inches <br /> -Minimum width of wall footings= 16 inches <br /> -Minimum lateral dimension of column footings=24 inches <br /> - Estimated post-construction settlement= 1/2 inch <br /> -Estimated post-construction differential settlement across building width= 1/2 inch <br /> A one-third increase in the above allowable bearing pressures can be used when considering <br /> short-term transitory wind or seismic loads. <br /> Lateral loads against the building foundations can be resisted by friction between the foundation <br /> and the supporting subgrade or by passive earth pressure acting on the buried portions of the <br /> foundations. For the latter case,the foundations must be poured "neat" against the existing <br /> undisturbed soil or be backfilled with compacted structural fill. Our recommended parameters <br /> are as follows: <br /> GEO Group Northwest,Inc. <br />