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Seaport Centre Levee System Operation and Maintenance Manual December 2022 • Repeat hydroseed application, as needed if first attempt was not successful • Control undesirable vegetation through use of herbicide, mechanical mowing, or other appropriate methods 2.2.2 Animal Control Program (baiting, trapping, and barriers) • Control of burrowing animals (gophers, ground squirrels, and rodents) with bait stations, fumigants, smoke bornbs, pesticides, and live trapping to prevent damage or colonization of levee embankments • Displace or exclude animals constructing and using dens (burrows) in thelevee embankments by mechanical rneans 2.2.3 Repair animal damage on levee slopes and at levee toe • Excavate burrow locations and reconstruct levee embankment • Pressure -fill burrows with bentonite clay, cement grout slurry. Slurry to consist of two parts bentonite clay, one part cement grout and water • Mud packing method may be used to backfill burrows • For information on the repair of animal burrows refer to FEMA Publication 473, Technical Manual for Dam Owners, Impacts of Animals on Earthen Dams as a reference for repair of animal burrows 2.2.4 Levee embankment and slope repairs • Excavate, repair, and reconstruct levee embankments due to seepage, slumps, cracks (longitudinal or transverse), loss of grade, sloughs, slides, rodent burrows, scour, or erosion in order to maintain full levee section • Reconstruct/raise levee crown due to sags, depressions, or groundwater subsidence • The levee is to be repaired to original design specifications. 2.2.5 Repair and maintenance of high ground areas along levee alignment • Fill potholes, ruts, or other loss of grade with compacted Class 2 aggregate base or other material to match existing per Caltrans Specifications 2.2.6 Repair of levee damage caused by flood events (scour, slumps, and sags) • Inspect and document cause of levee damage • Plans for repairs will be prepared by the City • Schedule and complete construction 2.3 Floodwall 2025.276 - SEAPORT PURCHASE AGREEMENT REV: 10-15-25 VR Page 3 of 7 BKF ENGINEERS