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REV: 11-19-25 LR o Consultant to develop a monitoring plan that uses flow gages at up to two (2) locations at Redwood Creek, including one upstream of the Bradford Pump Station. The Consultant will present and review the monitoring plan with the City’s Project Manager and City Staff and will install, maintain, and monitor two rental gaging stations for at least one continuous wet season to provide calibration data for the concurrent drainage system model builds. The sites will be chosen in close coordination with City staff. The stations at the site would be equipped with level monitors that, coupled with full flow rating curves, will be used to estimate discharge hydrographs for selected events. The rating curves will use the depth data and hydraulically developed rating curves to establish the hydrographs. Data processing can readily be expanded to include ongoing gaging installations in the Redwood Creek watershed, thus providing a comprehensive data set. The hydrographs will allow for calibration/validation of the models. o For calibration purposes, Consultant will also collect precipitation data for the same season at up to two (2) locations from existing available precipitation gage stations. The selection of this precipitation data will be conducted with input from the City’s Project Manager and City Staff. Deliverables: Monitoring plan with proposed locations, type, and duration of gaging for up to two (2) stream flow gages (PDF), Task 5. Hydrologic and Hydraulic Model Development, up to $86,423 Time and Materials (T&M) This task provides services to develop a Hydrologic and Hydraulic Model. As part of this task, the Consultant and team will use and build upon previous efforts to develop a more detailed and comprehensive model. Previous efforts include: the 2017 Eastern Low-Lying Area (ELLA) Drainage Master Plan InfoWorks ICM model developed by Wood Rodgers Inc., and the two-dimensional InfoWorks ICM model of Redwood Creek and its tributaries, from Alameda delas Pulgas to the Bay (the “Creek Model”). Services under this task will include: a.Task 5.a Model: a.Task 5.a.1 Review Existing Model: Consultant and team to review the two existing ICM models (ELLA Model and the Creek Model). The ELLA Model includes both one-dimensional modeling of the interior drainage and open channels mostly below El Camino Real, and two-dimensional modeling of the topography outside of the Creel. The Creek Model includes two- dimensional modeling of both the open channels and the topography outside of the Creek. b.Consultant will study, review, analyze, quantify, and qualify the differences of both models with a focus on their use for this project and outline how both models will be used in the project. Consultant to submit findings on writing to the City’s project manager. ATTY/AGR.2025.317/Wood Rodgers, Inc. (Page 17 of 77)