2023/09/13 Council Agenda Packet

Amendment 1 PSA with Brown and Caldwell for Port Gardner Storage Facility Project Exhibit A Scope of Work 16 • Provide review of up to 5 geotechnical related requests for information (RFIs) during construction. • Geotechnical special inspections (subgrade preparation) during construction, including: − Provide Subgrade Inspection: HWA will provide periodic site visits to verify that subgrade soils are suitable to provide support for the proposed structures anticipated this will take one to two site visits per structure for a total of approximately 30 hours including time for coordination, travel, and preparation of daily field reports. − Full-time Observation of Temporary Shoring and Excavations: HWA will provide full-time observation of the excavation and construction of the temporary shoring. This will include observation of sheet pile driving, monitoring for caving, verification that adequate depth is achieved, and placement of concrete & backfill. Anticipated this task will take about 10 workdays at 11 hours per day including time for coordination, travel, and preparation of daily field reports. − Full-time Observation of Driven Pile Foundation: HWA will provide full-time observation of pile driving. This will include observation of driving method, penetration rate, and verification that adequate depth is achieved. Anticipated this task will take about 20 workdays at 11 hours per day including time for coordination, travel, and preparation of daily field reports. − Full-time Observation of Installation of Ground: HWA will provide full-time observation of construction of ground improvements. This will include observation ground improvement test and production columns, monitoring performance metrics during construction, and verification that adequate depth is achieved. Anticipated this task will take about 10 workdays at 11 hours per day including time for coordination, travel, and preparation of daily field reports. − Final Inspection Report: Prepare a final inspection letter for submittal to the City stating that construction has adequately met the recommendations in the final geotechnical report. Task Assumptions • Subsurface investigations will include groundwater monitoring (at LS46 boring) to inform excavation and dewatering requirements. • Effluent Pump Station and Lift Station 46 shall be designed to meet International Building Code 2021 and ASCE 7-16 seismic codes. Additional seismic design requirements are documented in TM 09 Structural Design Guide, TM 31 Seismic Design, and the PGSF Basis of Design Report (July 2023). • Access to the site and all required exploration permits and right of entries will be provided to HWA by the City at no cost to HWA. • All IDW will be drummed and temporarily stored on site at a location provided by the City until disposal of the IDW is approved and drums are removed for disposal. Waste profile paperwork for disposal of IDW will be signed by a representative of the City. Estimated Subcontractor effort and IDW disposal costs are for non-hazardous wastes. • If analytical results of IDW indicate hazardous wastes are present, IDW disposal may incur additional labor, time, and subcontracting costs. These costs will be assumed to be funded from the Phase 700 budget for unanticipated services. • Recommendations and design parameters for Contractor designs will avoid designing means and methods for the Contractor and present their directions as recommendations/suggestions. The Contractor shall have ultimate choice on means and methods.