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City of Everett Point Industrial Center (EPIC) Bridge Project <br /> <br /> Page 11 of 28 <br /> <br />spectral acceleration parameters will then be selected in accordance with the AASHTO <br />Specifications for Roads and Bridges. <br /> <br />• Evaluate Slope Stability: HWA will evaluate the global slope stability of the steep <br />slopes to identify potential impacts on the project. Results of the field reconnaissance, <br />exploration, and testing programs will be incorporated into the analysis. Global stability <br />will be evaluated using the limit equilibrium approach under both static and seismic <br />loading conditions. Additionally, HWA will evaluate the anticipated stability of the <br />proposed eastern bridge approach. <br /> <br />• Evaluate Soils for Liquefaction and Lateral Spread Potential: HWA will evaluate <br />the susceptibility to liquefaction of the soils along the bridge alignment for the design <br />event required by AASHTO. Once the susceptibility to liquefaction is determined, we <br />will evaluate the potential for lateral spreading. <br /> <br />• Evaluate Soils for Settlement Potential: HWA will evaluate the subsurface soil <br />conditions for settlement potential. If compressible soils are present, HWA will conduct <br />settlement analysis associated with various bridge configurations. <br /> <br />• Conceptual Ground Improvement Evaluations: HWA will evaluate the subsurface <br />soil conditions and determine if ground improvements are expected to be required to <br />support the design and construction of the proposed improvements. If ground <br />improvements are needed, HWA will provide concept-level recommendations to <br />support the TS&L evaluation. <br /> <br />• Evaluate Bridge Foundation Vertical Capacity: HWA will perform analyses of <br />foundation vertical capacities using accepted drilled shaft and/or spread footing <br />estimation methods provided in the AASHTO LRFD Bridge Specifications and the <br />Washington State Department of Transportation (WSDOT) Geotechnical Design <br />Manual (GDM). <br /> <br />• Evaluate Bridge Foundation Lateral Capacity: HWA will develop bridge foundation <br />lateral parameters. The lateral parameters will be provided in the form of LPILE input <br />parameter tables for drilled shaft foundations and equivalent fluid passive pressures for <br />spread footings. <br /> <br />• Generate Abutment Lateral Earth Pressures: HWA will provide lateral earth <br />pressure recommendations for proposed abutment structures and wing walls. Earth <br />pressure diagrams for both static and seismic loading conditions will be generated using <br />the procedures outlined in the WSDOT GDM. <br /> <br />• Retaining Wall Design: HWA will provide design recommendations for retaining wall <br />structures proposed near the abutments. <br /> <br />Exhibit A