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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 is <br /> Component Routine Main- cedures) <br /> Inspection Needed (Stand- <br /> tenance ards) <br /> . Water deeply, but <br /> infrequently, so that <br /> the top 6to12 <br /> inches of the root <br /> zone is moist <br /> • Use soaker hoses or <br /> spot water with a <br /> shower type wand <br /> when irrigation sys- <br /> tem is not present <br /> Pulse water to <br /> enhance soil <br /> absorption, <br /> when feasible <br /> Pre-moisten <br /> soil to break <br /> surface tension <br /> of dry or hydro- <br /> phobic <br /> soils/mulch, fol- <br /> lowed by sev- <br /> eral more <br /> passes. With <br /> this method , <br /> each pass <br /> increases soil <br /> absorption and <br /> allows more <br /> water to infilt- <br /> rate prior to run. <br /> off <br /> • Add a tree bag or <br /> slow-release water- <br /> ing device (e.g., <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4-Page 882 <br />