10105 19TH AVE SE Geotech Report 2018-01-02 MF Import

� � I I • Geaechnical Engineering Evaluation Everett Veterinary Clinic February 2l,2002 NGA File No.342902 ( Page 9 condition exists. It may be necessary to overexcavate and remove wet soils in cases where drying to a � compacteble condition is not feasible. All compaction should be accomplished by equipment of a type Iand size sufficient to attain the desired degree of compaction. I Foundations Conventional shallow spread foundations should be placed on undisturbed medium dense or better native I soils or be supported on structural fill or rock spalls extending to those soils. Where less-denx soils are encountered at footing bearing elevations, the subgrade should be overexcavated to expose suitable bearing soil. The overexcavation may be filled with strucroral fill or wncrete, or the footing may be Iextended to the bearing native soils. If footings are supported on structural fill,the fill zone should extend outside the edges of the footing a distance equal to one-half of the depth of overexcavation below the Ifinished subgrade. IBoth perimeter and interior footings should extend at least l8 inches below the lowest adjacent finished ground surface for frost prutection and bearing capacity considerations. Minimum foundation widths of 16 and 24 inches should be used for continuous and isolated spread footings, respectively. Standing I- water should not lx: allowed to accumulate in footing trenches. All loose or disturbed soil should be � removed from the foundation excavation prior to placing concrete. ' For foundations constructed as outlined above, we recommend an allowable design benring pressure of no more than 2,000 pounds per square foot (ps� be used for designing footings founded on the medium � dense to dense till soils. The foundation bearing soil should bc evaluated by a representative of our firm at the time of construction. We should be consulted if higher beuring pressures are needed. Current Uniform Building Code (UBC) guidelines should be used when considaring increased allowable bearing ! pressure for short-term transitory wind or seismic loads. Potential foundation settlement using the recommended allowable bearing pressure is estimated to be less than 1 inch total and 1/2 inch differential � between adjacent footinr,s or across a distance of about 40 feet, based on our experience with similer residentinl projects. ILateral loads may be resisted by friction on the base ot the footing und passive resistance against the subsurface portions of the foundrtion. A ccefficient of friction of 035 may be used ro calculate the base � I 111ELSON GEOTECHN/CAL ASSOC/ATES, INC. 10