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IGeotechnical Engineering Report <br /> lierracon <br /> Merrill Creek Operations Base Expansion • Everett, Washington <br /> III <br /> December 14, 2020 • Terracon Project No. 81205012 GeoReport <br /> Ipasses below a 45-degree "cone"extending downwards from the bottom edge of a footing should <br /> be considered to be within that footing's cone of influence, and requires addition evaluation. <br /> 1 Design Parameters <br /> Structures with unbalanced backfill levels on opposite sides should be designed for earth I <br /> pressures at least equal to values indicated in the following table. Earth pressures will be <br /> influenced by structural design of the walls, conditions of wall restraint, methods of construction <br /> I and/or compaction and the strength of the materials being restrained. The "at-rest" condition <br /> assumes no wall movement and is commonly used for basement walls, loading dock walls, or <br /> other walls restrained at the top. The recommended design lateral earth pressures do not include <br /> Ia factor of safety and do not provide for hydrostatic pressure on the walls. <br /> S=Surcharge For active pressure movemen <br /> (0.002 H to 0.004 H) <br /> I SI For at-rest pressure <br /> -No Movement Assumed <br /> Horizontal <br /> I Finished <br /> Grade <br /> H <br /> I / Horizontal <br /> Finished Grade <br /> If—p--- p,-0l Retaining Wall <br /> I <br /> Earth Pressure Design Parameters ILateral <br /> Earth Pressure Coefficient for Backfill Uniform Pressure ''3'4 Effective Fluid <br /> Condition Type p, (psf) Pressures (psf) <br /> I <br /> At Res�Ko) 0.43 (0.43)S (58)H <br /> Seismics --- (12)H—At-Rest --- <br /> I 1. Uniform, horizontal backfill, compacted to at least 92 percent of the ASTM D 1557 maximum dry density, <br /> rendering a maximum unit weight of 135 pcf. <br /> 2. Uniform surcharge,where S is surcharge pressure (psf). <br /> I 3. Loading from heavy compaction equipment is not included. <br /> 4. No safety factor is included in these values. <br /> 5. Values are in addition to static earth pressures <br /> IBackfill placed against structures should consist of Structural Fill, as discussed in the Earthwork <br /> section. For the pressure values presented above to be valid, the structural backfill must extend <br /> Iout and up from the base of the wall at an angle of at least 45 degrees. <br /> I <br /> IResponsive ■ Resourceful ■ Reliable 16 <br />