10632 7TH AVE SE Geotech Report 2025-07-28

I June 2008 6, Serenity Meadows L&A Job No. 8A017 Page 13 BUILDING FOUNDATIONS Conventional footing foundations may be used to support the buildings to be constructed on the site. The footing found Lions should be supported on dense to very-dense, fresh, advance Ioutwash and/or till soils, or on structural fill constructed on these competent basal soils. Excavation depth of 3.0 to 10.0 feet below existing grade would be required to reach down to such competent soils. Water accumulating in footing trenches should be pumped dry and disturbed loose and over-saturated soils in footing trenches should be completely removed or down to firm bearing soils before pouring concrete for footing foundations. If the above recommendations are followed, our recommended design criteria for footing foundations are as follows: • Allowable soil bearing pressure, including dead and live loads, should be no more than 3,000 psf with footing foundations constructed on fresh advance outwash and/or till soils, and no more than 2,500 psf for footings poured on structural fill constructed on these competent basal soils. The footing bearing soils should be verified onsite by a geotechnical engineer after the footing trenches have been excavated and before the footings are poured. • The minimum depth to bottom of perimeter footings below adjacent final exterior grade should be no less than 18 inches. The minimum depth to bottom of the interior footings below top of floor slab should be no less than 12 inches. • The minimum width should be no less than 16 inches for continuous footings,and no less than 24 inches for individual footings, except those footings supporting light deck and porches. A one-third increase in the above recommended allowable soil bearing pressure may be used when consideringshort-term,transitory,wind or seismic loads. For footing foundations designed � and constructed per recommendations above, we estimate that the maximum total post LIU & ASSOCIATES, INC.