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Task 4 Geotechnical Engineering and Report <br /> In conjunction with the structural analysis, the CONSULTANT will perform geotechnical <br /> engineering and analysis and provide input to the structural engineer(s)to inform the <br /> determination of potential vulnerabilities and proposed retrofits. <br /> The AASHTO Guide Specifications for LRFD Seismic Bridge Design requires site-specific ground <br /> motion response for structures founded in Site Class F soils. Based on published geologic maps <br /> and soil information gathered from previous borings in the PROJECT vicinity, CONSULTANT has <br /> determined the anticipated Site Class for seismic design is not Class F. Site-specific ground <br /> motion response will not be evaluated for the PROJECT. <br /> Task 4.1 Geotechnical Engineering <br /> The CONSULTANT will: <br /> • Project Setup:The CONSULTANT will set the project up in their accounting program <br /> and will develop a health and safety plan for proposed field work. <br /> • Attend Project Kickoff Meeting: The CONSULTANT will attend one project kickoff <br /> meeting with the City and the design team. This meeting will review project <br /> objectives, communication protocol and schedule. The CONSULTANT assumes that <br /> this meeting will take place at the City of Everett's office. <br /> • Collect and Review Available Geotechnical Data: The CONSULTANT will review <br /> readily available and relevant information along the project corridor. This review <br /> will include online geotechnical databases, geologic maps and HWA library. <br /> • Evaluate Field and Laboratory Data: Based on the existing borings the CONSULTANT <br /> will generate estimates of the soil strength and other properties needed to evaluate <br /> the effects the subsurface conditions will have on the bridge during a seismic event. <br /> Soil properties that will be developed include static and dynamic shear strengths, <br /> stiffness and low-strain shear wave velocities. <br /> • Develop Geologic Profile: The CONSULTANT will develop a geologic profile along the <br /> bridge alignment based on the results of the of the existing subsurface explorations. <br /> This geologic profile will be used to evaluate slope stability and other geologic <br /> hazards. <br /> • Generate seismic design ground motion parameters for a two-level analysis (100-yr <br /> and 1,000-yr return periods) using 2014 USGS Hazard Maps. <br /> Maple Heights Bridge Seismic Retrofit 11 <br />