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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 /> bucket with a per- <br /> forated bottom)for <br /> watering newly <br /> installed trees when <br /> irrigation system is <br /> not present <br /> • 10 to 15 gallons per <br /> tree <br /> • 3 to 5 gallons per <br /> shrub <br /> • 2 gallons water per <br /> square foot for <br /> groundcover areas <br /> . Water deeply, but <br /> infrequently, so that <br /> the top 6to 12 <br /> inches of the root <br /> Once every 2- Trees, shrubs zone is moist <br /> Summer water-4 weeks or as and ground- <br /> ing (second needed during covers in • <br /> spot water with a <br /> and third second or third <br /> prolonged dry shower type wand <br /> years) year of estab- <br /> periods lishment period when irrigation sys- <br /> tem is not present <br /> o 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 /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 883 <br />