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Seaway Commercial Center Subsurface Exploration,Geologic Hazard, <br /> 7007 Seaway Boulevard and Geotechnical Engineering Evaluation <br /> Everett, Washington Design Recommendations <br /> the recommendations in this report. Foundation bearing verification may also be required by <br /> City of Everett. <br /> 11.6 Foundation Drainage <br /> Perimeter footing drains should be provided as discussed under the "Drainage Considerations" <br /> section of this report. <br /> 11.7 Passive Resistance and Friction Factor <br /> Lateral loads can be resisted by friction between the base of the foundation and the supporting <br /> native sediments or structural fill soils, or by passive earth pressure acting on the buried <br /> portions of the foundations. The foundations must be backfilled with compacted structural fill <br /> to achieve the passive resistance provided below. We recommend the following design <br /> parameters: <br /> • Passive equivalent fluid = 300 pounds per cubic foot <br /> • Coefficient of friction =0.30 <br /> The above values are allowable and include a safety factor of 1.5. <br /> 12.0 SLAB-ON-GRADE SUPPORT <br /> Slab-on-grade floors may be constructed either directly on the medium dense to dense native <br /> sediments or on structural fill placed over these materials. In areas where floor slabs will be <br /> placed on disturbed subgrade soils, the surface of the subgrade should be recompacted to a <br /> firm and unyielding condition prior to placing the capillary break as described below. <br /> If moisture intrusion through the floor slabs is to be controlled, the floors should be <br /> constructed atop a capillary break consisting of a minimum thickness of 4 inches of washed pea <br /> gravel or washed, crushed rock. The pea gravel or crushed rock should be overlain by a 10-mil <br /> (minimum thickness) plastic vapor retarder. <br /> 13.0 DRAINAGE CONSIDERATIONS <br /> All footings should be provided with a drain at the footing elevation. Drains should consist of <br /> rigid, perforated, polyvinyl chloride (PVC) pipe surrounded by washed pea gravel. The level of <br /> the perforations in the pipe should be set downward and at the bottom of the footing at all <br /> locations, and the drain collectors should be constructed with sufficient gradient to allow <br /> gravity discharge away from the new distribution center. Roof and surface runoff should not <br /> December 17,2021 ASSOCIATED EARTH SCIENCES,INC. <br /> PEL/id-20200319E001-002 Page 15 <br />