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I <br /> KRAZAN&ASSOCIATES,INC. <br /> KA Project No. 092-20006 <br /> DRAFT Geotechnical Engineering Investigation <br /> Everett Water Main"V" <br /> May 7,2020 <br /> Page No. 10 <br /> Project Area 2 <br /> I <br /> Table 3: Seismic Design Parameters I <br /> (Reference: 2015 IBC Section 1613.3.2,ASCE,and ATC) <br /> Seismic Item Value <br /> Site Coefficient Fa 1 <br /> SS 1.287 <br /> SMs 1.287 <br /> SDS 0.858 <br /> Site Coefficient F,, 1.511 1 <br /> S i 0.489 <br /> SMi 0.739 <br /> SDI 0.493 <br /> Additional seismic considerations include liquefaction potential and amplification of ground motion by <br /> soft soil deposits. The liquefaction potential is highest for loose sand with a high groundwater table. <br /> The medium dense to very dense native soils interpreted to underlie the site are considered to have a <br /> low potential for liquefaction and amplification of ground motion. <br /> Project Area 3: The 2015 International Building Code(IBC), Section 1613.3.2, refers to Chapter 20 of <br /> ASCE-7 for Site Class Definitions. Based on information from the soil borings, it is our opinion that <br /> the overall soil profile corresponds to Site Class D as defined by Table 20.3-1 "Site Class Definitions," <br /> according to the 2010 ASCE-7 Standard. Site Class D applies to a"Stiff Soil"profile. The seismic site <br /> 111 <br /> class is based on a soil profile extending to a depth of 100 feet. The soil borings for this project <br /> extended to a maximum depth of about 11.5 feet and this seismic site class designation is based on the <br /> assumption that similar soil conditions continue below the depth explored. I <br /> We referred to the Applied Technology Council (ATC)Hazards by Location Website and the 2015 IBC <br /> to obtain values for Ss, SMs, SDS, S1, SM1, SDI, Fa, and F. The ATC website includes the most updated <br /> published data on seismic conditions. The seismic design parameters for this site are presented in the <br /> following table. <br /> I <br /> I <br /> Krazan&Associates,Inc. <br /> Offices Serving The Western United States <br /> r <br />