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IV. Routine Bio-retention Inspection and Maintenance: <br />1. The principal maintenance objective is to prevent sediment buildup and clogging, which <br />reduces the pollutant removal efficiency and may lead to bio-retention area failure. Routine <br />maintenance activities and the frequency at which they should be conducted are shown in <br />table 1. <br />Table 1 <br />Routine Inspection and Maintenance Activities for Bio- <br />Retention Areas <br />No. <br />Maintenance Task <br />Frequency of Task <br />1 <br />Remove obstructions, debris and trash from bio-retention area <br />Monthly, or as needed after storm <br />and dispose of properly. <br />events <br />2 <br />Inspect bio-retention area for ponded water. If ponded water <br />Monthly, or as needed after storm <br />does not drain within 2-3 days, till and replace the surface soil <br />events <br />and replant. <br />3 <br />Inspect inlets for channels, soil exposure or other evidence of <br />Monthly, or as needed after storm <br />erosion. Clear obstructions and remove sediment. <br />events <br />4 <br />Remove and replace all dead and diseased vegetation. <br />Twice a year <br />5 <br />Maintain vegetation and the irrigation system. Prune and weed <br />Twice a year <br />to keep bio-retention area neat and orderly in appearance. <br />Remove and or replace any dead plants. <br />6 <br />Check that mulch is at appropriate depth and replenish as <br />Monthly <br />necessary before wet season begins. <br />7 <br />Inspect the energy dissipation at the inlet to insure it is <br />Annually, before the wet season <br />functioning adequately, and that there is no scour of the <br />begins <br />surface mulch. <br />8 <br />Inspect bio-retention area using the attached inspection <br />Monthly, or after large storm <br />checklist. <br />events, and after- removal of <br />accumulated debris or material <br />