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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> uenc when main_ <br /> Maintenanceq Y a Action Needed (Pro- <br /> tenance is <br /> Component Routine Main- cedures) <br /> Inspection Needed (Stand- <br /> Inspection ards) <br /> weeders, or hot <br /> water weeders as <br /> appropriate <br /> . Follow 1PM pro- <br /> tocols for weed man- <br /> agement(see <br /> "Additional Main- <br /> tenance Resources" <br /> section for more <br /> information on IPM <br /> protocols) <br /> Edge or trim ground- <br /> Low-lying veget- covers and shrubs at <br /> ation growing facility edge <br /> beyond facility • Avoid mechanical <br /> edge onto side- <br /> blade-type edger <br /> walks, paths, or and do not use <br /> Once in early street edge <br /> to mid- May poses ped- edger or trimmer <br /> within 2 feet of tree <br /> and once in estrian safety trunks <br /> early-to mid- hazard or may <br /> September clog adjacent • While some clip- <br /> Excessive permeable pave- pings can be left in <br /> vegetation ment surfaces the facility to replen- <br /> due to asso- ish organic material <br /> ciated leaf litter, in the soil, excessive <br /> mulch, and soil leaf litter can cause <br /> surface soil clogging <br /> Excessive veget- • Determine whether <br /> ation density pruning or other <br /> inhibits storm- routine maintenance <br /> As needed water flow bey- is adequate to main- <br /> and design tain proper plant <br /> ponding or density and aes- <br /> thetics <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 879 <br />