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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> Maintenance quency a when Main Action Needed (Pro- <br /> tenance is <br /> Component Routine Main-Neededcedures) <br /> Inspection (Stand <br /> ards) <br /> destroyed by sed- <br /> iment accumulation <br /> and removal <br /> . Mulch newly planted <br /> reduced (see vegetation <br /> "Ponded water") . Identify and control <br /> or surface stor- the sediment source <br /> age capacity sig- (if feasible) <br /> nificantly . If accumulated sed- <br /> impacted iment is recurrent, <br /> consider adding pre- <br /> settlement or <br /> installing berms to <br /> create a forebay at <br /> the inlet <br /> Remove leaves if there is <br /> During/after Accumulated a risk to clogging outlet <br /> fall leaf drop leaves in facility structure or water flow is <br /> impeded <br /> Sediment, veget- <br /> ation, or debris <br /> accumulated at <br /> or blocking (or <br /> A, S having the Clear the blockage <br /> Low per- potential to <br /> meability block) check <br /> check dams dam, flow con- <br /> and weirs trol weir or ori- <br /> fice <br /> Erosion and/or Repair and take pre- <br /> A, S undercutting ventative measures to pre- <br /> present vent future erosion and/or <br /> undercutting <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 865 <br />