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April 19, 2023 <br />HWA Project No. 2023-048-21 <br />River Point Geotechnical/Geoenvironmental Study Scope <br />• Review Available Geoenvironmental Data: HWA will only review environmental <br />documents for the project site as provided on the City of Everett’s SharePoint site. <br /> <br />• Perform Geotechnical Site Reconnaissance: HWA will conduct a geotechnical site <br />reconnaissance of the project area. This reconnaissance will be used to identify site <br />geometry, constraints, and geotechnical challenges. <br /> <br />Geotechnical Design Services: <br />• Evaluate Geotechnical Field and Laboratory Data: Based on available subsurface <br />information, HWA will generate estimates of the soil strength and other properties <br />needed to evaluate the geotechnical challenges at the site. <br /> <br />• Generate AASHTO Seismic Design Parameters: Based on the soils encountered along <br />the alignment, HWA will determine the Site Class for seismic design. The design <br />spectral acceleration parameters will then be selected in accordance with the AASHTO <br />Specifications for Road and Bridge. <br /> <br />• Evaluate Liquefaction Potential: HWA will evaluate the susceptibility of the subsurface <br />soils to liquefaction along across the project site and assess the potential impacts to the <br />proposed improvements. <br />• Evaluate Geoenvironmental Impacts: HWA will evaluate the existing <br />geoenvironmental information as noted above and identify geoenvironmental challenges <br />that may impact the development of the site. <br /> <br />• Develop Geologic Cross Sections: HWA will develop up to four (4) geologic cross <br />sections. Each cross section will be used for evaluation of geotechnical challenges. <br /> <br />• Evaluate Settlement Potential and Mitigation Measures: HWA will evaluate the <br />existing geotechnical information and identify areas that consolidation settlements is <br />expected across the project site. HWA will provide concept level recommendations for <br />possible settlement mitigation measures. <br />• Conduct Preliminary Slope Stability Analysis: HWA will conduct preliminary slope <br />stability modeling, with limit equilibrium methods, for each of the geologic cross sections <br />generated. Slope stability analysis will be conducted under static, pseudo-static, and post <br />liquefaction loading conditions. <br />• Conduct Infiltration Potential Screening: HWA will evaluate existing grain size and <br />groundwater data to determine if onsite infiltration is expected to be feasible across the <br />site.