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Geotechnical Engineering Report-Revised lierracon <br /> Proposed CFT Retail â– Everett,Washington <br /> February 1, 2018â– Terracon Project No. 81185002 <br /> 1. The recommended net allowable bearing pressure is the pressure in excess of the minimum <br /> surrounding overburden pressure at the footing base elevation. Assumes any unsuitable fill or soft <br /> soil, if encountered, will be removed and replaced with structural fill. <br /> 2. For frost protection and to reduce the effects of seasonal moisture variations in the subgrade soil. <br /> 3. The foundation settlement will depend upon the variations within the subsurface soil profile, the <br /> structural loading conditions, the embedment depth of the footings, the thickness of compacted fill, <br /> and the quality of the earthwork operations. <br /> The allowable foundation bearing pressures apply to dead loads plus design live load conditions. <br /> The design bearing pressure may be increased by one-third when considering total loads that <br /> include wind or seismic conditions. The weight of the foundation concrete below grade may be <br /> neglected in dead load computations. <br /> Footings and foundations should be reinforced as necessary to reduce the potential for distress <br /> caused by differential foundation movement. <br /> Foundation excavations should be observed by a Terracon representative. If the soil conditions <br /> encountered differ from those presented in this report, supplemental recommendations will be <br /> required. <br /> 4.3.2 Foundation Drains <br /> We recommend that the building be encircled with a perimeter foundation drain to collect exterior <br /> seepage water. This drain should consist of a 4-inch diameter perforated pipe within an envelope <br /> of washed rock, extending at least 6 inches on all sides of the pipe. The washed rock should <br /> conform to WSDOT Section 9-03.12(4), Gravel Backfill for Drains or 9-03.12(5), Gravel Backfill <br /> for Drywells.The washed rock envelope should be wrapped with filter fabric(such as Mirafi 140N) <br /> to reduce the migration of fines from the surrounding soil. Ideally, the drain invert would be <br /> installed no more than 8 inches above or below the base of the perimeter footings. The perimeter <br /> foundation drain should not be connected to roof downspout drains and should be constructed to <br /> discharge into the site storm water system or other appropriate outlet. These recommendations <br /> are summarized in the figure below. <br /> Responsive a Resourceful at Reliable 10 <br />