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KRAZAN&ASSOCIATES,INC. I <br /> KA Project No. 092-20006 <br /> DRAFT Geotechnical Engineering Investigation <br /> Everett Water Main"V" <br /> May 7,2020 <br /> Page No. 8 <br /> Project <br /> ,Area 3: The Natural Resources Conservation Services (NRCS) map for Snohomish County <br /> classifies the site area as Alderwood-Urban land complex(2 to 8 percent slopes) and Urban Land. The <br /> NRCS indicates that the Alderwood-Urban land complex soils (2 to 8 percent slopes) have a moderate <br /> hazard for erosion when exposed. The Urban Land area was not rated for hazard of erosion. <br /> General: It has been our experience that soil erosion potential can be minimized through surface water I <br /> runoff control. Typically,erosion of exposed soils will be most noticeable during periods of rainfall and <br /> may be controlled by the use of normal temporary erosion control measures, i.e., silt fences, hay bales, <br /> mulching, control ditches or diversion trenching, and contour furrowing. Erosion control measures <br /> should be in place before the onset of wet weather. Stormwater runoff from the surrounding pavement <br /> areas should be directed away from the utility trenches. <br /> Seismic Hazard <br /> Project Area 1: The 2015 International Building Code(IBC), Section 1613.3.2, refers to Chapter 20 of I <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 /> 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. <br /> We referred to the Applied Technology Council (ATC) Hazards by Location Website and the 2015 IBC <br /> to obtain values for Ss, SiwS, SDS, SI, SMI, SDI, Fa, and Fv. 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 /> a <br /> I <br /> I <br /> I <br /> Krazan&Associates,Inc. <br /> Offices Serving The Western United States <br /> I <br />