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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> uenc <br /> Maintenance q Y a when Main- Action Needed (Pro- <br /> tenance is <br /> Component Routine Main- cedures) <br /> Inspection Needed (Stand- <br /> tenance ards) <br /> tain plant cover <br /> Pest Control <br /> • Identify the cause of <br /> the standing water <br /> and take appropriate <br /> actions to address <br /> the problem (see <br /> "Ponded water") <br /> • To facilitate main- <br /> tenance, manually <br /> remove standing <br /> water and direct to <br /> the storm drainage <br /> system (if runoff is <br /> from non pollution- <br /> Standing water generating surfaces) <br /> remains for or sanitary sewer <br /> Mosquitoes B, S more than 3 system (if runoff is <br /> days after the from pollution-gen- <br /> end of a storm erating surfaces) <br /> after getting <br /> approval from san- <br /> itary sewer authority. <br /> . Use of pesticides or <br /> Bacillus thuring- <br /> iensis israelensis <br /> (Bti) may be con- <br /> sidered only as a <br /> temporary measure <br /> while addressing the <br /> standing water <br /> cause. If overflow to <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 885 <br />