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Page 12 <br />kimley-horn.com 2828 Colby Avenue, Suite 200 Everett, WA 98201 425-708-8275 <br />·Evaluate Slope Stability: HWA will evaluate the global slope stability of the proposed <br />abutments to identify potential impacts to the project. Results of the explorations and <br />testing programs will be incorporated in the analysis. Global stability will be evaluated <br />using the limit equilibrium approach under both static and seismic loading conditions. <br />·Evaluate Soils for Liquefaction: HWA will evaluate the susceptibility to liquefaction of the <br />soils along the bridge alignment for the design event required by AASHTO. Once the <br />susceptibility to liquefaction is determined, the potential for instability will be evaluated. <br />·Evaluate Bridge Foundation Vertical Capacity: HWA will perform analyses of foundation <br />vertical capacities using accepted drilled shaft and/or spread footing estimation methods <br />provided in the AASHTO LRFD Bridge Design Specifications and WSDOT Geotechnical <br />Design Manual (GDM). <br />·Evaluate Bridge Foundation Lateral Capacity: HWA will develop bridge foundation lateral <br />parameters. The lateral parameters will be provided in the form of LPILE input parameter <br />tables for drilled shaft foundations and equivalent fluid passive pressures for spread <br />footings. <br />·Generate Abutment Lateral Earth Pressures: HWA will provide lateral earth pressure <br />recommendations for proposed abutment structures and wing walls. Earth pressure <br />diagrams for both static and seismic loading conditions will be generated using the <br />procedures outlined in the WSDOT GDM. <br />·Infiltration Screening Analysis: HWA will utilize soil and groundwater information <br />obtained from the subsurface explorations to screen for infiltration potential along the <br />proposed bridge alignment. If infiltration is determined to be feasible, HWA will work with <br />the design team to execute required infiltration testing, under a separate scope of work. <br />·Hazardous Materials Evaluation: HWA shall evaluate the existing environmental soil and <br />groundwater data obtained from the sampling of the geotechnical borings and provide <br />recommendations in the geotechnical report related to environmental considerations <br />associated with proposed improvements. <br />·Retaining Wall Design: HWA will provide design recommendations for retaining wall <br />structures proposed near the abutments. <br />·Specification Development: HWA will assist the design team in the development of <br />geotechnical-related specifications. HWA expects that this will include retaining wall and <br />foundation specification assistance. <br />·HWA QA/QC: HWA will have all design calculations and recommendations reviewed by <br />a senior principal prior to distribution to the design team or the City. <br />Geotechnical Reporting <br />·Prepare Draft Geotechnical Engineering Report: HWA will prepare a draft geotechnical <br />engineering report for the project. This report will contain the results of the geotechnical <br />engineering investigation including description of surface and subsurface conditions, a <br />site plan showing exploration locations and other pertinent features, summary boring <br />logs, environmental findings and recommendations, and laboratory test results. The