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Seaport Centre Levee System Operation and Maintenance Manual December 2022 Maintenance measures are necessary to ensure serviceability of the floodwalls to withstand flood events up to the design flood event. A Vegetation --Free Zone is required to allow for visual inspection of the floodwall. Vegetation other than shallow rooted grasses or similar shall not he permitted within 15 feet from the floodwall. This is necessary to prevent obstructions to maintenance vehicles and activities. A rodent abatement program shall be employed as soon as evidence of burrowing activity is found near a floodwall. 2.3.1 Removal or trimming of vegetation within levee easement • Cut, trim, and remove native and non-native ground covers, understory, vines, herbaceous vegetation, and volunteers from inboard side of floodwalls as needed to facilitate visual inspection 2.3.2 Removal or pruning of all vegetation encroaching within levee easement • Limb up tree branches to 8 feet (14 feet above maintenance roads) above grade and remove ground cover that obscures visual inspections and flood fighting activities • Partner with property owners on a voluntary basis to cut, trim, and or remove landscape ground covers, brush, and ornamentals from adjacent private propertywhich encroaches within 15 feet of all floodwalls 2.3.3 Repair of floodwall damage • Inspect and document cause of floodwall cracks, spalling, or other damage • Plans for repairs will be prepared by the City • Schedule and complete construction • Monitor repair site for performance 2.4 Interior Drainage System Outfalls which penetrate the levee must be maintained and repaired as necessary to ensure that they continue to operate as intended and at full design capacity. Outfalls which have failed, including backflow valves that are not operating properly or positive closure valves that are inoperable, may create flooding. Mechanical closures shall be exercised and operated for testing no less than annually. 2.4.1 Outfall flap gate service and repairs • Check for damage • Check for rust • Confirm proper seating and sealing of flap gate on culvert • Service frame and lubricate pivots 2.4.2 Pipe inspection, repairs, and sediment removal • Evaluate pipes for sediment, settled sections, and/or blockages 2025.276 - SEAPORT PURCHASE AGREEMENT WE REV: 10-15-25 VR Page 4 of 7 BKF ENGINEERS i j