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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-Neededcedures) <br /> Inspection (Stand-tenance ards) <br /> Mulch <br /> . Supplement mulch <br /> with hand tools to a <br /> depth of 2 to 3 <br /> inches <br /> Bare spots . Replenish mulch per <br /> (without mulch O&M manual. Often <br /> Following cover) are coarse compost is <br /> Mulch weeding present or used in the bottom of <br /> mulch depth the facility and arbor- <br /> less than 2 ist wood chips are <br /> inches used on side slopes <br /> and rim (above typ- <br /> ical water levels) <br /> . Keep all mulch away <br /> from woody stems <br /> Watering <br /> Based on man-Irrigation system Follow manufacturer's <br /> ufacturer's present instructions for O&M <br /> instructions <br /> Irrigation sys- Sprinklers or <br /> tern (if any) drip irrigation Redirect sprinklers or <br /> A not dir- move drip irrigation to <br /> ected/located to desired areas <br /> properly water <br /> plants <br /> • 10 to 15 gallons per <br /> Once every 1- Trees, shrubs tree <br /> Summer water- 2 weeks or as and ground- . 3 to 5 gallons per <br /> ing (first year) needed during covers in first shrub <br /> prolonged dry year of estab- • 2 gallons water per <br /> periods lishment period square foot for <br /> groundcover areas <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 881 <br />