2025/06/04 Council Agenda Packet

Exhibit A (Scope of Work) • Draft and final documents will be provided to the City by email, to ease the electronic HPA submittal package to the WDFW by email (by the City). This will include the Wetland and Stream Delineation and Wildlife Habitat Assessment Report (prepared under Task 4.1), JARPA form and figures per USACE standards, (as described herein), mitigation and monitoring plan, and selected design drawings and available information to illustrate and describe the project for HPA review. 4.4 NPDES Construction Stormwater General Permit (CSGP) It is unknown if construction of the PROJECT may require an acre or more of cumulative land disturbance triggering CSGP Notice of Intent (NOI) submittal. However, submitting permit coverage is advised since work will occur over and in Pigeon Creek 2 and permit coverage could be required by ecology due to potential water quality risks to the stream. If no permit is obtained prior to construction, Ecology could require coverage during construction and cause construction delays. TASK 4.4 ASSUMPTIONS • The City will be provided with application forms after submittal and will need to sign and return forms to Ecology and publish the required public notices. • Permit coverage will be transferred to the Operator (Contractor) after bid award and before construction. All permit fees will be paid by the permittee and transfer of coverage will be included in the project manual. • The Stormwater Pollution Protection Plan (SWPPP) will be provided by the Contractor in specifications and permit compliance will be addressed by Contractor. TASK 4.4 DELIVERABLES: • Draft specification for Contractor compliance and permittee responsibility. 5. Hydraulic Modeling and Alternatives Analysis This task will inform you of the layout and/or alignment of the selected option. Identify and select a design solution for Pigeon Creek 2 that will minimize temporary and permanent creek and wetland impacts for replacing the existing barrier culvert with a 100% fish passible conveyance of the creek under Olympic Blvd while minimizing sensitive area impacts. Options/elements to include Box Culver t, Arch Culvert, Precast Bridge and daylighting portions of Pigeon Creek 2 for all types of structures. 5.1 Hydraulic Modeling Otak will perform hydraulic modeling for stream and structure design to support Everett’s preliminary design. Refinement of the model to support final design will be completed under a contract amendment. The goal of hydraulic modeling is to ensure that the design allows for safe fish passage. Select flows such as a fish passage design flow, summer low flow, 2-year flow, and 100-year flow will be modeled and extracted results will be used to support preliminary design. TASK 5.1 ASSUMPTIONS Consultant to provide modeling and modeling documentation of the options and should include: