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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 q Y a Action Needed (Pro- <br /> tenance <br /> Corn Component is cedures) <br /> Routine Main-Needed (Stand- <br /> Inspection tenance <br /> ards) <br /> Grade board or <br /> A top of weir dam- Restore to level position <br /> aged or not <br /> level <br /> Determine cause and <br /> resolve in the following <br /> order: <br /> 1. Confirm leaf or <br /> debris buildup in the <br /> bottom of the facility <br /> is not impeding infilt- <br /> ration. If necessary, <br /> remove leaf lit- <br /> Excessive pond- ter/debris. <br /> ing water:Water 2. Ensure that under- <br /> overflows during drain (if present) is <br /> storms smaller not clogged. If neces- <br /> than the design sary, clear under- <br /> Ponded water B, S event or ponded drain. <br /> water remains in 3. Check for other <br /> the basin 48 water inputs (e.g., <br /> hours or longer groundwater, illicit <br /> after the end of connections). <br /> a storm. 4. Verify that the facility <br /> is sized appro- <br /> priately for the con- <br /> tributing area. <br /> Confirm that the con- <br /> tributing area has <br /> not increased. If <br /> steps#1-4 do not <br /> solve the problem, <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 866 <br />