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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> when - <br /> Maintenance quency a Main Action Needed (Pro- <br /> tenance is <br /> Component Routine Main- cedures) <br /> Inspection Needed (stand_ <br /> ards) <br /> . Determine if planting <br /> type should be <br /> replaced to avoid <br /> ongoing main- <br /> tenance issues (an <br /> aggressive grower <br /> under perfect grow- <br /> ing conditions <br /> should be trans- <br /> planted to a location <br /> where it will not <br /> becomes a haz- impact flow) <br /> and for ped- . Remove plants that <br /> estrian and are weak, broken or <br /> vehicular cir- not true to form; <br /> culation and replace in-kind <br /> safety <br /> • Thin grass or plants <br /> impacting facility <br /> function without leav- <br /> ing visual holes or <br /> bare soil areas <br /> • Consultation with a <br /> landscape architect <br /> is recommended for <br /> removal, transplant, <br /> or substitution of <br /> plants <br /> Vegetation <br /> blocking curb <br /> As needed cuts, causing Remove vegetation and <br /> excessive sed- sediment buildup <br /> iment buildup <br /> and flow bypass <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 880 <br />