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BIO-RETENTION <br />Routine Maintenance Activities <br />The maintenance objectives for the landscaped stormwater treatment include keeping up the pollutant <br />removal efficiency of the channel by maintaining a dense, healthy vegetated cover. Routine <br />maintenance activities, and the frequency at which they will be conducted, are shown in the table <br />below. <br />Routine Maintenance Activities for Landscape Based Treatment Areas <br />No. <br />Maintenance Task <br />Frequency of <br />Task <br />1 <br />Remove obstructions, debris and trash from the treatment measure and <br />Minimum 3 <br />dispose of properly. <br />times/year.' <br />2 <br />Inspect the treatment measure to ensure that it drains between storms and <br />Minimum 3 <br />within five days after rainfall. <br />times/year.' <br />3 <br />Inspect downspouts, curb cuts, overflow pipes, inflow pipes, outflow pipes, <br />and/or bubble ups to ensure flow to the treatment measure is unimpeded. <br />Minimum 3 <br />Remove debris and repair damaged pipes. Check splash blocks or rocks and <br />times/year.' <br />repair, replace and replenish as necessary. <br />4 <br />Inspect inlets for channeling, ruts and holes, soil exposure or other evidence <br />Minimum 3 <br />of erosion. <br />times/year.' <br />5 <br />Clear obstructions and remove sediment accumulating near inlets when it <br />builds up to 2 inches at any spot, or if it covers vegetation. Dispose of <br />Minimum 3 <br />sediment properly. <br />times/year.' <br />6 <br />Inspect concrete lined measures to ensure that box is structurally sound (no <br />cracks or leaks). Repair as necessary. <br />Annually <br />7 <br />Evaluate health of vegetation. Remove and replace all dead and diseased <br />vegetation. Replace with vegetation with similar growth requirements. List the <br />plants to be used in the treatment area here, or attach a separate sheet: <br />Monthly <br />8 <br />Maintain vegetation and the irrigation system. Irrigate vegetation when <br />necessary. Mow, prune and/or weed to keep the treatment measure neat and <br />orderly in appearance. Remove any invasive vegetation and/or weeds. Treat <br />Monthly <br />vegetation using preventative and low -toxic methods (Integrated Pest <br />Management). <br />9 <br />Check that mulch, cobble, and/or treatment soi12 are at the appropriate depth/s <br />Minimum 3 <br />(per design specifications) and replenish when necessary. <br />times/year.' <br />10 <br />Inspect the treatment measure using the inspection checklist. <br />Minimum 3 <br />times/year.' <br />Check the appropriate landscaped based measures that are located at this site: <br />❑ Bioretention Area []Flow -Through Planter <br />❑ Tree Well Filter []Vegetated Swale <br />