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Geotechnical Engineering Report lierracon <br /> Merrill Creek Operations Base Expansion E Everett, Washington <br /> December 14, 2020 I Terracon Project No. 81205012 GeoReport <br /> to a firm, unyielding condition when the moisture content is more than 2 percentage points above <br /> or below optimum. Optimum moisture content is the moisture content at which the maximum dry <br /> density for the material is achieved in the laboratory by the ASTM D1557 test procedure. <br /> If inclement weather or in situ soil moisture content prevents the use of on-site material as <br /> structural fill, we recommend use of materials specified in Fill Material Types for free-draining <br /> granular fill. <br /> Stockpiled soils should be protected with polyethylene sheeting anchored to withstand local wind <br /> conditions and preservation of the soil's moisture content. <br /> SHALLOW FOUNDATIONS <br /> If the site has been prepared in accordance with the requirements noted in Earthwork, the <br /> following design parameters are applicable for shallow foundations. <br /> Design Parameters — Compressive and Lateral Loads <br /> Description Spread Footing Wall Footing <br /> Net Allowable Bearing Pressure}' <br /> Structural Fill Over Native Soil 3,000 psf 3,000 psf <br /> Minimum Dimensions 24 inches 18 inches <br /> Embedment Below Finished Grade' Minimum 18 inches I Minimum 18 inches <br /> Approximate Static Total Settlement From <1 inch <1 inch <br /> Foundation Loads For Condition Specified <br /> Estimated Static Differential Settlement From <br /> About 1/2 of total settlement <br /> Foundation Loads <br /> Allowable Passive Pressure' <br /> Compacted Structural Fill or Free- 300 pcf(equivalent fluid unit weight) <br /> Draining Fill <br /> Allowable Coefficient of Sliding Friction' 0.40 <br /> Responsive • Resourceful • Reliable <br />