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Exhibit C: Landscape Based Maintenance Plan Landscape Based Maintenance Plan Routine Maintenance Activities The maintenance objectives for the landscaped stormwater treatment include keeping up the pollutant removal efficiency of the channel by maintaining a dense, healthy vegetated cover. Routine maintenance activities, and the frequency at which they will be conducted, are shown in the table below. Routine Maintenance Activities for Landscape Based Treatment Areas No. Maintenance Task Frequency of Task 1 Remove obstructions, debris and trash from the treatment measure and Minimum 3 dispose of properly. times/year.1 2 Inspect the treatment measure to ensure that it drains between storms and Minimum 3 within five days after rainfall. times/year.1 3 Inspect downspouts, curb cuts, overflow pipes, inflow pipes, outflow pipes, and/or bubble ups to ensure flow to the treatment measure is unimpeded. Minimum 3 Remove debris and repair damaged pipes. Check splash blocks or rocks and times/year.1 repair, replace and replenish as necessary. 4 Inspect inlets for channeling, ruts and holes, soil exposure or other evidence Minimum 3 of erosion. times/year.' 5 Clear obstructions and remove sediment accumulating near inlets when it builds up to 2 inches at any spot, or if it covers vegetation. Dispose of Minimum 3 sediment properly. times/year. 6 Inspect concrete lined measures to ensure that box is structurally sound (no Annually cracks or leaks). Repair as necessary. 7 Evaluate health of vegetation. Remove and replace all dead and diseased vegetation. Replace with vegetation with similar growth requirements. List the plants to be used in the treatment area here, or attach a separate sheet: Refer to the attached table B-1 from the Alameda County Clean Water Monthly Program for a list of approved vegetation that may be used in bio-retention areas. 8 Maintain vegetation and the irrigation system. Irrigate vegetation when necessary. Mow, prune and/or weed to keep the treatment measure neat and orderly in appearance. Remove any invasive vegetation and/or weeds. Treat Monthly vegetation using preventative and low-toxic methods (Integrated Pest Management). 9 Check that mulch, cobble, and/or treatment soil2 are at the appropriate depth/s Minimum 3 (per design specifications) and replenish when necessary. times/year.1 10 Inspect the treatment measure using the inspection checklist provided in Minimum 3 Exhibit D. times/year.1 Check the appropriate landscaped based measures that are located at this site: El Bioretention Area ❑Flow-Through Planter ❑Tree Well Filter ❑Vegetated Swale