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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 /> Maintenance quency a Action Needed (Pro- <br /> tenance is <br /> Component Routine Main- cedures) <br /> Inspection Needed (Stand- <br /> tenance ards) <br /> . Clean, rake, and <br /> comb grasses when <br /> they become too tall <br /> . Cut back to ground <br /> or thin every 2-3 <br /> years as needed <br /> • By law, class A & B <br /> noxious weeds must <br /> be removed, <br /> bagged and dis- <br /> posed as garbage <br /> immediately <br /> • Reasonable <br /> attempts must be <br /> made to remove and <br /> Listed noxious dispose of class C <br /> M (March - vegetation is noxious weeds <br /> Noxious October, pre- present(refer to <br /> weeds ceding seed current county • It is strongly encour- <br /> dispersal) noxious weed aged that herbicides <br /> list) and pesticides not <br /> be used in order to <br /> protect water quality; <br /> use of herbicides <br /> and pesticides may <br /> be prohibited in <br /> some jurisdictions <br /> • Apply mulch after <br /> weed removal (see <br /> "Mulch" ) <br /> M (March - . Remove weeds with <br /> Weeds October, pre- Weeds are their roots manually <br /> ceding seed present with pincer-type <br /> dispersal) weeding tools, flame <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 878 <br />