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REV: 11-19-25 LR a. Verify as-built data along a system b. Reduce inspection locations with the verified as-built data c. Reduce the need for costly CCTV inspections Open channel inspection planning will prioritize inspections with criterion such as: 1. High Priority = already failing, subject to more failure 2. Med Priority = not failing but large contributing watershed 3. Low Priority = not failing and small contributing watershed After reviewing the data collected in task 2, Consultant and team will develop a field inspection plan to collect additional data required to complete geometric attributes of the modeled drainage network and to perform a condition assessment of drainage facilities with focus on open channel systems. Consultant will significantly reduce the effort necessary for the conditions assessment by targeting strategic locations. The field inspection plan will outline the techniques for collecting field data, inspection procedures, and protocols, as well as the locations and types of facilities chosen for inspections. Task 3.a Open Channel Inspections: a. Subconsultant to visually inspect approximately 15 locations along concrete line open channels. This includes open channel locations with vertical or sloped concrete walls to identify structural issues just like wall panel rotations or offsets, and joint separation. Concrete channel inspections will be prioritized particularly at locations with known condition concerns based on coordination with the City’s project engineer, or for locations that have frequent reported flooding (hot spots), and as needed thorough the Redwood creek system to understand the overall condition of facilities. Information will be collected in the field using a comprehensive inspection form developed for mobile devices that store information in the GIS database which can be used to attach photos or produce standardized inspection reports. Task 3.b Channel Field Survey: Some previous flood modeling efforts combined BKF’s Redwood City Bridge and Drainage Structure Study that accounted for more than sixty (60) bridge and culvert crossings along Redwood Creek and Jefferson Branch combined with County 1-meter LiDAR data and City GIS data. While this level of information was sufficient for evaluating flooding at a regional scale, conducting field investigations will provide additional value by confirming and validating the previous models. As part of this task, the following field investigations will be performed: a. Task 3.b.1 Public Creek Crossings: Subconsultant to perform field surveys of up to ten (10) public roadway and pedestrian creek crossings to spot- ATTY/AGR.2025.317/Wood Rodgers, Inc. (Page 15 of 77)