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Subsurface Exploration,Geologic Hazard,and <br /> Janowicz Property Geotechnical Engineering Report <br /> Everett,Washington Geologic Hazards and Mitigations <br /> 6.2 Seismically Induced Landslides <br /> As discussed above in "Landslide Hazards and Mitigation," it is our recommendation that in the <br /> vicinity of the landslide hazard area a deep foundation system be used to avoid impacting the <br /> stability of the existing slope. <br /> 6.3 Liquefaction <br /> • <br /> liquefaction is a temporary foss in soil shear strength that can occur when loose granular soils <br /> below the groundwater table are exposed to cyclic accelerations, such as those that occur <br /> during earthquakes. <br /> The City of Everett defines seismic and liquefaction hazard areas as: <br /> • <br /> a. Those areas mapped as seismic/liquefaction hazards per the Dames and Moore <br /> Methodology for the Inventory, Classification and Designation of Geologically <br /> Hazardous Areas;City of Everett,Washington:July 1, 1991. <br /> b. Those areas mapped as high and moderate to high liquefaction susceptibility on the <br /> Liquefaction Susceptibility Map of Snohomish County, Washington, Washington <br /> State Department of Natural Resources,Palmer,Stephen,et al.,September, 2004. <br /> On the Dames and Moore map, the site is not shown within an area of Potential Seismic <br /> Hazard. On the Liquefaction Susceptibility Map, the site is mapped as very low liquefaction <br /> susceptibility. <br /> Based on subsurface conditions observed in our exploration borings site soils pose a low risk of <br /> liquefaction-induced settlements due to the high silt content and relative density and <br /> consistency of the underlying non-glacial sediments. No quantitative liquefaction analysis was <br /> completed as part of this study,and none is warranted, in our opinion. <br /> 6.4 Ground Motion <br /> Structural design of buildings should follow the current applicable building code. In our <br /> opinion, the native soils at the site are consistent with seismic Site Class "D" as defined in <br /> Table 1613.5.2 of the 2015 International Building Code (IBC), and the publication ASCE 7 - <br /> Minimum Design Loads for Buildings and Other Structures referenced therein. <br /> May 10,2018 ASSOCIATED EARTH SCIENCES,INC. <br /> NSM-170649E7X72-2-Projectr1201706491KE1WP Page 8 <br />