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• Geotechnical Engineering Report 9 January 8,2021 <br /> Glint Car Wash and Sonic Everett,Everett,Washington RGI Project No.2020-643-1 <br /> 5 feet of the foundation for perimeter (or exterior) footings and finished floor level for <br /> interior footings. <br /> Table 4 Foundation Design <br /> Design Parameter Value <br /> Allowable Bearing Capacity— 2,500 psf1 <br /> Structural fill <br /> Friction Coefficient 0.25 <br /> Passive pressure (equivalent fluid pressure) 250 pcf2 <br /> Minimum foundation dimensions Columns: 24 inches <br /> Walls: 16 inches <br /> 1 psf=pounds per square foot <br /> 2 pcf=pounds per cubic foot <br /> The allowable foundation bearing pressures apply to dead loads plus design live load <br /> conditions. For short-term loads, such as wind and seismic, a 1/3 increase in this <br /> allowable capacity may be used. At perimeter locations, RGI recommends not including <br /> the upper 12 inches of soil in the computation of passive pressures because it can be <br /> affected by weather or disturbed by future grading activity. The passive pressure value <br /> assumes the foundation will be constructed neat against competent soil or backfilled with <br /> structural fill as described in Section 5.2.4. The recommended base friction and passive <br /> resistance value includes a safety factor of about 1.5. <br /> With spread-footing foundations designed in accordance with the recommendations in <br /> this section, maximum total and differential post-construction settlements of 1-1/2 inch <br /> and 3/4 inch, respectively, should be expected. <br /> 5.4 RETAINING WALL <br /> If retaining walls are needed, RGI recommends cast-in-place concrete walls be used. The <br /> footing should be supported on 18 inches of structural fill or dense native soil. The <br /> magnitude of earth pressure development on retaining walls will partly depend on the <br /> quality of the wall backfill. RGI recommends placing and compacting wall backfill as <br /> structural fill. Wall drainage will be needed behind the wall face. A typical retaining wall <br /> drainage detail is shown on Figure 3. <br /> With wall backfill placed and compacted as recommended, and drainage properly <br /> installed, RGI recommends using the values in the following table for design. <br /> Corporate Office <br /> 17522 Bothell Way Northeast <br /> Bothell,Washington 98011 <br /> Phone 425.415.0551• Fax 425.415.0311 <br /> x %riley-group.co <br />