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IGeotechnical Engineering Report lierracon <br /> Merrill Creek Operations Base Expansion Everett, Washington <br /> IDecember 14, 2020 Terracon Project No. 81205012 GeoReport <br /> I <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 /> I <br /> If inclement weather or in situ soil moisture content prevents the use of on-site material as <br /> I structural fill, we recommend use of materials specified in Fill Material Types for free-draining <br /> granular fill. <br /> I Stockpiled soils should be protected with polyethylene sheeting anchored to withstand local wind <br /> conditions and preservation of the soil's moisture content. <br /> I SHALLOW FOUNDATIONS <br /> I If the site has been prepared in accordance with the requirements noted in , the <br /> following design parameters are applicable for shallow foundations. <br /> IDesign Parameters — Compressive and Lateral Loads <br /> Description Spread Footing Wall Footing <br /> INet Allowable Bearing Pressure • <br /> al Structural Fill Over Native Soil 3,000 psf 3,000 psf <br /> IMinimum Dimensions 24 inches 18 inches <br /> Embedment Below Finished Grade 2 Minimum 18 inches Minimum 18 inches <br /> IApproximate Static Total Settlement From <1 inch <1 inch <br /> Foundation Loads For Condition Specified <br /> I Estimated Static Differential Settlement From <br /> Foundation Loads About 1/2 of total settlement <br /> Allowable Passive Pressure <br /> ICompacted Structural Fill or Free- 300 pcf(equivalent fluid unit weight) <br /> Draining Fill <br /> IAllowable Coefficient of Sliding Frictions 0.40 <br /> I <br /> I <br /> I <br /> Responsive • Resourceful ■ Reliable <br />