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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> Maintenance quency a when main_ Action Needed (Pro- <br /> tenance is <br /> Component Routine Main-Neededcedures) <br /> Inspection (Stand-tenance ards) <br /> the bioretention soil <br /> is likely clogged by <br /> sediment accu- <br /> mulation at the sur- <br /> face or has become <br /> overly compacted. <br /> Dig a small hole to <br /> observe soil profile <br /> and identify com- <br /> paction depth or clog- <br /> ging front to help <br /> determine the soil <br /> depth to be removed <br /> or otherwise rehab- <br /> ilitated (e.g., tilled). <br /> Consultation with an <br /> engineer is recom- <br /> mended. <br /> . Minimize all loading <br /> in the facility foot- <br /> print(foot traffic and <br /> other loads)to the <br /> Bioretention soil degree feasible in <br /> media pro- order to prevent corn- <br /> tection is paction of biore- <br /> Bioretention needed when tention soils. <br /> media As needed performing main- <br /> soilNever drive equip- <br /> tenance requir- ment or apply heavy <br /> ing entrance pp y <br /> loads in facility foot- <br /> into the facility <br /> print. <br /> footprint <br /> . Because the risk of <br /> compaction is higher <br /> during saturated soil <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 867 <br />