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December 2024 Page 4 of 9 Jacobs Engineering Group Task 2300 - Geotechnical Investigation Geotechnical information will be obtained to support the detailed design. Assumptions: • Traffic control will be provided by the City of Everett. Activities: • Provide final groundwater measurement for existing wells. • Update Geotechnical Data Reports (Storage Tank Site and Pacific Avenue) and Geotechnical Engineering Report to include final groundwater measurements. Deliverables (Storage Tank Site): 1. Update to Final Geotechnical Data Report Storage Tank Site – electronic files (PDF). 2. Update to Final Geotechnical Engineering Report Storage Tank Site – electronic files (PDF). 3. Update to Final Geotechnical Data Report Pipeline Alignment – electronic files (PDF). Task 2440 – Issue for Bid Documents The Consultant will revise the previously prepared 100 percent design documents to the final stage of design completion, including incorporating the comments from previous design submittal. The Consultant performed hydraulic modeling to support design and controls development for the 36th Street Combined System Storage Facility for the City of Everett, Washington (City). Since the design of the facility, the City has amended their design storm series by ten years to include large historic storm events through 2020. The Consultant completed a follow up analysis to identify new storms from the period of record through 2020 with climate impacts (climate adjusted) that cause flooding at the 36th Street CSO Storage Facility and in the piping between the 36th Street Regulator and the Snohomish River Outfall 8 (SRO8). Four historic storm events were identified with extreme intensity of 0.7 inches or greater for the peak hour which cause potential CSOs at the 36th Street Regulator and 36th CSO Storage site. These “micro-burst” storms also cause flooding in the model upstream of the 36th Street Regulator. The City is now requesting that the Consultant perform a sensitivity analysis to help identify impacts of these “micro-burst” storms which often are not uniform across the system. The analysis will focus on eliminating CSOs at the 36th Street Regulator via passive and active control settings. These settings adjustments will not change the 100% design of the regulator structure. Assumptions: • See Subsection 2, “Assumptions for Amendment No. 2” in front of this document. • Same drawings as at 100%. • Only limited changes, consistent with previous comments and decisions and items noted at the 100% design workshop. Activities: • The Consultant will visually examine the project site to verify that site conditions have not