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2401 Taylor Drive Geotechnical Engineering Study <br /> Everett,Washington <br /> 4 feet high then at a maximum slope of 1H:1V(Horizontal:Vertical). If ground water seepage is <br /> observed in the cut,the temporary slopes may need to be readjusted.As is typical with earthwork <br /> operations, some sloughing and raveling may occur, and cut slopes may have to be adjusted in <br /> the field. In addition,WISHA/OSHA regulations should be followed at all times. <br /> Permanent cut slopes in the native deposits should be no steeper than a 2H:1V inclination. Fill <br /> slopes should either be overbuilt and trimmed back to final grade or surface compacted to a <br /> specified density. <br /> A high percentage of fine-grained material within portions of the on-site soils makes them <br /> moisture-sensitive and subject to disturbance when wet. The contractor must use care during <br /> site preparation and excavation operations so that the underlying soils are not softened. If <br /> disturbance occurs, the softened soils should be removed and the area brought to grade with <br /> structural fill. Consideration should be given to protecting access and staging areas with an <br /> appropriate section of crushed rock or asphalt treated base(ATB). <br /> Foundation.Support <br /> Conventional Spread Footings <br /> The foundation bearing stratum should consist of either structure fill over medium stiff to hard <br /> native soils or foundations that bear directly upon the native sediments and shallow spread <br /> footing may be utilized. <br /> Structural.fill. .placed below foundation areas should consist :of granuIar.material.placed in <br /> maximum loose lift thicknesses of 8 inches with each lift compacted to at least 95 percent of the <br /> modified Proctor maximum dry density, as determined by American Society for Testing and <br /> Materials (ASTM): D 1557. Structural fill placed below footing areas should extend laterally <br /> beyond the footing edges a distance equal to or greater than the thickness of the fill. Sediments <br /> exposed in footing excavations should be compacted to a firm and unyielding condition prior to <br /> footing placement. <br /> For footings founded upon structural fill or directly on native soil or structural fill placed over <br /> native soil,we recommend that an allowable bearing pressure of 2,000 pounds per square foot <br /> (psf) be used for design purposes, including both dead and live loads. An increase of one-third <br /> may be used for short-term wind or seismic loading. <br /> Perimeter footings for the proposed buildings should be buried a minimum of 18 inches into the <br /> surrounding soil for frost protection.-.No-minimum burial depth is required for interior footings; <br /> however, all footings must penetrate to the prescribed stratum, and no footings should be <br /> founded in or above loose, organic,or existing uncompacted fill soils. <br /> November 6,2019 SONDERGARRD GEOSCIENCES,PLLC <br /> 7 <br />