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WPCF Headworks Replacement Project Scope of Work <br />22 <br /> <br />o Geologic and Seismic Characterization: HWA will develop geologic cross sections and <br />determine seismic design parameters including Site Class and spectral accelerations <br />per 2024 IBC and ASCE 7-22 standards. <br />o Soil Behavior and Stability Assessments: HWA will evaluate liquefaction potential, <br />settlement risks, lateral spreading, slope instability, residual shear strength, and <br />consolidation settlement for non-pile supported structures. <br />o Foundation and Ground Improvement Design Support: HWA will coordinate with <br />structural engineers to assess deep and shallow foundation capacities, lateral soil <br />parameters, down drag loads, and conceptual ground improvement options. <br />o Reporting and Design Integration: HWA will prepare and revise geotechnical reports at <br />each design milestone (preliminary, intermediate, and final), followed by a Final <br />Geotechnical Engineering Report to be included with the construction documents. HWA <br />will respond to review comments, and provide ongoing support for design alternatives, <br />temporary shoring, dewatering, and plan/specification reviews. <br /> Hydrogeology Analysis and Reporting <br />o Dewatering Analysis: HWA will evaluate up to three excavation configurations using <br />aquifer parameters from pumping tests to estimate dewatering rates tailored to site <br />conditions. <br />o Documentation and Review: A technical memorandum will be prepared detailing <br />methods, results, and figures for design team use, with one round of review comment <br />responses incorporated into the final report. This memorandum is intended for the use <br />of the design team and owner, and should not be included in bid documents, as <br />dewatering rates will ultimately depend on contractor means and methods. <br />o Ongoing Hydrogeologic Support: Additional dewatering analysis and technical assistance <br />will be provided as needed, within the established project budget. <br />Task Assumptions <br /> Geoenvironmental documents for the site and the adjoining properties will not require more <br />than 8 hours to review. If a significant amount of documentation is provided that requires <br />more than 8 hours to review, additional charges may occur. <br /> A total drilling footage of 750 feet (with 300 feet of groundwater monitoring well screen) has <br />been assumed for cost estimates. <br /> Drilling will be completed using hollow-stem auger or mud rotary techniques. Rock coring and <br />sonic drilling are excluded. <br /> The proposed environmental sampling and chemical laboratory testing is based on general <br />IDW disposal requirements. Disposal facility requirements can vary based on the disposal <br />facility. The proposed chemical laboratory analysis may not include all PCOC for the disposal <br />facility selected during the construction phase of the project. <br /> Drilling spoils will be drummed and stored onsite, or at a City designated location within 3 <br />miles of the site, until environmental testing can be completed and the IDW can be disposed <br />of at an appropriate disposal facility. Waste profile paperwork required for disposal of the <br />IDW will need to be signed by the City or City representative. Disposal costs of the IDW are <br />based on non-hazardous waste disposal (i.e., Subtitle D landfill). If analytical results indicate <br />that hazardous wastes are present, disposal of IDW as hazardous waste (i.e., Subtitle C <br />landfill) may be required which could incur additional charges and/or extension of the <br />estimated time to dispose of the IDW. <br /> City will provide City ROW permits, if required, at no cost to HWA.