1505 112TH ST SW 2018-01-02 MF Import

GEOTECHNICAL ENGINEERING STUDY &5613 wells Development Corpnrstinn July 27, IM Page S Based on the encountered site conditions, preliminary building design criteria. and assuming compliance with the -preceding 'Site Preparation and Grading' section, the proposed structures may be supported on conventional shallow footing systems bearing on competent native sails and/or structural fill. The upper brown silty sands will be suitable for the support of foundations, provided they are recompacted prior to placement of forms. Continuous footing walls for support of the inspection building may be designed for a maximum allowable bearing value of two thousand (2,000) pounds per square foot. Footings should be at least twelve (12) inches in width and should extend to a depth of at least eighteen (18) inches below the lowest adjacent finished subgrade or interior floor slab surface. These basic allowable bearing values are for dead plus live loads and may be increased one-third for combined dead, live, wind, and seismic forces. It is estimated that total and differential tooting settlements for the relatively light building will be on the order of one-half inch. It is recommended that all footing excavations be observed by a representative of ECI, prior to placing forms or rebar, to verify that subgrade support conditions are as anticipated in this report, and/or provide suitable modifications in design, as required. Ar. allowable lateral bearing value against the sides of footings, grade beams or other subsurface foundation elements of two hundred fifty (250) psf per foot of depth may be used provided there is pssitive contact between the vertical bearing surface and the adjacent compacted fill or firm natural soils. Friction between the base of footings and/or floor slabs and the underlying soil may be assumed as forty (40) percent of the dead load. Friction and lateral pressure may be combined provided the assumed lateral bearing resistance does not exceed two-thirds of the combined allowable. Earth Consultants, Inc.