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December 2024 Page 5 of 9 Jacobs Engineering Group changed since the time of initial site survey and notify/discuss any significant findings which may have an impact on proposed improvements. • The Consultant will prepare construction plans and specifications by completing final design and incorporating comments from previous design submittal. • The Consultant will submit final documents for bidding. • Storm Sensitivity Analysis: o Review available precipitation gage inventory for up to 8 precipitation gage locations and storms exceeding peak hour intensity of 0.5 inches per hour. The precipitation gage inventory includes the following sites available from the National Oceanic and Atmospheric Administration (NOAA) or other state and local sources including the Silver Lake Gage (US1WA SN0067), US1WA SN0020, US1WA SN0036, US1WA SN0027, US1WA SN0004, and COOP 452675. City gauges will also be used. The consultant will identify if additional sources are available. The City will provide any additional local historic precipitation data available from City-owned gages at Fire Station 4, Lift Station 2, Service Center and Lift Station 33. For representative storm events with high intensity, a climate impacted adjustment will be applied equal to the scaling methodology used for the precipitation record at the Silver Lake Gage. o Overlay historic storm events with peak hour intensity of 0.5 inches per hour or greater at each gage location to identify uniform and variable characteristics of micro-burst storm events. Select up to 10 storm events with high intensity to perform hydrologic and hydraulic modeling. Evaluate the storms that cause overflows at SRO4, SRO7, and SRO8 in the future (w/ climate adjustment) condition and see if the number of overflows is reduced with the sensitivity analysis. o Summarize flow and overflow characteristics by location for each of 10 storm events including flows near the 36th Street Regulator, Pacific Regulator, SR4, and the proposed Port Gardner Diversion locations. o Characterize impacts of the micro-burst storm on the 36th Street Regulator, Storage Facility, and downstream infrastructure based on the variable and uniform storm characteristics for high intensity events. o Coordinate recommendations and summary with Port Gardner Diversion team. o Provide recommendations on 36th Street Regulator control refinements for micro-burst storms. The conclusion may include no change to recommended operational controls. o Develop a draft and final technical memorandum summarizing the analysis. o Meet with the City and Port Gardner Diversion team virtually up to two (2) times to discuss the analysis and present results. Meetings are assumed to be one (1) hour duration each. Deliverables: Final Documents for bidding: 1. Draft and Final Storm Sensitivity Analysis Technical Memorandum – electronic files (PDF). 2. Review Comment Responses – electronic files (PDF). 3. Full-size Plans – electronic files (PDF). 4. Project Manual Documents – electronic files (PDF).