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Geotechnical Engineering Report- Revised lierracon <br /> Proposed CFT Retail Everett,Washington <br /> February 1, 2018 Terracon Project No. 81185002 <br /> Construction site safety is the sole responsibility of the contractor who controls the means, <br /> methods and sequencing of construction operations. Under no circumstances shall the <br /> information provided herein be interpreted to mean that Terracon is assuming any responsibility <br /> for construction site safety or the contractor's activities;such responsibility shall neither be implied <br /> nor inferred. <br /> 4.3 Foundations <br /> Our explorations encountered up to about 7 feet of previously placed, undocumented fill across <br /> the site. Due to the unpredictability of the existing fill, we recommend complete removal of existing <br /> fill below the proposed CFT Retail building and replacement with structural fill. If loose, materials <br /> are encountered at or below proposed footing depths during construction, those materials should <br /> also be removed and replaced with structural fill. The lateral extent of existing fill to be removed <br /> and replaced for the building pad should be at least two-thirds of the depth of excavation beyond <br /> the building pad footprint at the perimeter footing location. <br /> All overexcavated areas and excavations resulting from removal of the existing structures and fill <br /> should be backfilled with structural fill in accordance with the Earthwork section of this report. In <br /> our opinion, after these overexcavations are completed, the proposed buildings can be supported <br /> by a shallow, spread footing foundation system bearing on compacted structural fill extending to <br /> at least medium dense native soils. Design recommendations for shallow foundations for the <br /> proposed structures are presented in the following paragraphs. <br /> 4.3.1 Design Recommendations <br /> DESCRIPTION Column Wall <br /> Net allowable bearing pressure 2,500 psf 2,500 psf <br /> Minimum dimensions 24 inches 18 inches <br /> Minimum embedment below finished exterior 24 inches 18 inches <br /> grade for perimeter footings 2 <br /> Minimum embedment below finished floor 12 inches 12 inches <br /> grade for interior footings <br /> Approximate total settlement 3 <1 inch <1 inch <br /> <1/2 inch between <br /> Estimated differential settlement 3 <�/2 inch over 40 feet <br /> columns <br /> Ultimate coefficient of sliding friction 0.40 <br /> Responsive Resourceful Reliable 9 <br />