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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 /> Component <br /> tenance is cedures) <br /> Routine Main-Needed (Stand- ) <br /> Inspection tenance <br /> ards) <br /> around and below <br /> mature trees, follow <br /> the most current <br /> ANSI A300 stand- <br /> ards and ISA BMPs <br /> to the extent prac- <br /> ticable (e.g.,take <br /> care to minimize any <br /> damage to tree roots <br /> and avoid com- <br /> paction of soil). <br /> beneath mature . Planting of small <br /> Spring trees shrubs or ground- <br /> covers beneath <br /> mature trees may be <br /> desirable in some <br /> cases; such plant- <br /> ings should use <br /> mainly plants that <br /> come as bulbs, bare <br /> root or in 4-inch pots; <br /> plants should be in <br /> no larger than 1-gal- <br /> lon containers. <br /> . Verify location of <br /> facility liners and <br /> Presence of or underdrain (if any) <br /> need for stakes prior to stake install- <br /> Fall and and guys (tree ation in order to pre- <br /> Spring growth, mat- vent liner puncture <br /> uration, and sup- or pipe damage <br /> port needs) . Monitor tree support <br /> systems: Repair and <br /> adjust as needed to <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 875 <br />