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PROPOSED LIBERTY HALL,EVERETT COMMUNITY COLLEGE Everett,Washington <br /> and within the native sand deposits during the wet winter and spring months. Groundwater <br /> seepage is expected to fluctuate as a result of season, precipitation,and other factors. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> thq ak itgi seE.d yns <br /> GeoEngineers has evaluated the site for seismic hazards, including liquefaction, lateral spreading, <br /> fault rupture and earthquake induced landsliding. Our evaluation indicates the site does not have <br /> liquefiable soils present and therefore also has no risk of liquefaction-induced lateral spreading. In <br /> addition,the site has a low risk of fault rupture and earthquake-induced landsliding. <br /> We recommend the 2009 International Building Code (IBC) parameters for Site Class, short period <br /> spectral response acceleration (Ss), 1-second period spectral response acceleration (Si), and <br /> Seismic Coefficients FA and Fv presented in Table 2. <br /> TABLE 2. 2009 IBC SEISMIC PARAMETERS <br /> 2009 IBC Parameter Recommended <br /> Value <br /> Site Class D <br /> Short Period Spectral Response Acceleration,Ss(percent g) 114.7 <br /> 1-Second Period Spectral Response Acceleration,Si(percent g) 40 <br /> Seismic Coefficient,FA 1.04 <br /> Seismic Coefficient,Fv 1.6 <br /> Based on the subsurface soil conditions encountered in the borings, we expect the soils at the site <br /> may be excavated using conventional heavy duty construction equipment. The materials we <br /> encountered include fill,silt and clay deposits, and dense to very dense glacially consolidated soils. <br /> Dense glacial deposits in the area commonly contain cobbles and boulders that may be <br /> encountered during excavation. Accordingly, the contractor should be prepared to deal with <br /> boulders. <br /> The on-site soils contain significant fines (material passing the U.S. standard No. 200 sieve) and <br /> will be highly moisture-sensitive and susceptible to disturbance, especially when wet. Ideally, <br /> earthwork should be undertaken during extended periods of dry weather when the surficial soils <br /> will be less susceptible to disturbance and provide better support for construction equipment. <br /> Trafficability on the site may be difficult,even during dry weather conditions, due to the clay and silt <br /> deposits that will be exposed during grading. The native soils will be especially susceptible to <br /> disturbance from construction equipment during wet weather conditions and pumping and rutting <br /> of the exposed soils under equipment loads may occur. The contractor should be prepared to <br /> protect the site and prevent subgrade soils from deteriorating in wet weather conditions. <br /> Page 4 lune 10,201C GeoEngineers,Inc. <br /> Flle igu.6836 010-00 <br />