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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> when Main- <br /> Maintenance quency a Action Needed (Pro- <br /> tenance is <br /> Component Routine Main-Neededcedures) <br /> Inspection (Stand <br /> ards) <br /> inches (relative <br /> to undisturbed <br /> sections of <br /> berm) <br /> Downstream Plug any holes and corn- <br /> face of berm pact berm (may require <br /> A, S wet, seeps or consultation with engin- <br /> leaks evident eer, particularly for larger <br /> berms) <br /> • Eradicate rodents <br /> (see "Pest control") <br /> Any evidence of . Fill holes and com- <br /> A rodent holes or pact(may require <br /> water piping in consultation with <br /> berm engineer, par- <br /> ticularly for larger <br /> berms) <br /> oncrete side- Cracks or failure • Repair/seal cracks <br /> C <br /> Cons A of concrete side- . Replace if repair is <br /> walls insufficient <br /> Stabilize rockery side- <br /> Rockery side Rockery side walls (may require con- <br /> walls A walls are insec- sultation with engineer, <br /> ure particularly for walls 4 feet <br /> or greater in height) <br /> All Facility area main- <br /> tenance visits Trash and Clean out trash and debris <br /> (at least bian- debris present <br /> nually) <br /> Accumulated • Remove excess sed- <br /> Facility bottom A sediment to iment <br /> area ' S extent that infilt- . Replace any veget- <br /> ration rate is ation damaged or <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4-Page 864 <br />