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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recomm <br /> ended Fre- Condition <br /> Maintenance quency a when Main-tenance is Action Needed (Pro- <br /> Component Routine Main-Neededcedures) <br /> Inspection (Stand- <br /> ards) <br /> provide support and <br /> prevent damage to <br /> tree. <br /> . Remove tree sup- <br /> ports (stakes, guys, <br /> etc.) after one grow- <br /> ing season or max- <br /> imum of 1 year. <br /> . Backfill stake holes <br /> after removal. <br /> . Maintain appropriate <br /> height for sight clear- <br /> ance <br /> . When continued, reg- <br /> ular pruning (more <br /> than one time/grow- <br /> ing season) is <br /> Trees and required to maintain <br /> shrubs adja- visual sight lines for <br /> cent to vehicle Vegetation safety or clearance <br /> travel areas causes some along a walk or <br /> (or areas A visibility (line of drive, consider relo- <br /> where vis- sight) or driver cating the plant to a <br /> ibility needs to safety issues more appropriate loc- <br /> be main- ation. <br /> tained) . Remove or trans- <br /> plant if continual <br /> safety hazard <br /> . Consultation with a <br /> landscape architect <br /> is recommended for <br /> removal, transplant, <br /> or substitution of <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 876 <br />