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No. 22(continued)-Maintenance Standards and Procedures for Permeable Pavement. <br /> Recommended Frequency. <br /> Component - - Condition when Maintenance is Needed Action Needed <br /> Inspection Routine (Standards) (Procedures) <br /> Maintenance <br /> Inlets/Outlets/Pipes(cont'd) <br /> Overflow B Native soil is exposed or other signs of erosion damage are Repair erosion and stabilize surface <br /> present at discharge point <br /> Aggregate Storage Reservoir <br /> Observation port A,S Water remains in the storage aggregate longer than If immediate cause of extended ponding is not identified,schedule investigation of subsurface materials or other potential <br /> anticipated by design after the end of a storm causes of system failure. <br /> Vegetation <br /> Adjacent large shrubs As needed Vegetation related fallout clogs or will potentially clog voids •Sweep leaf litter and sediment to prevent surface clogging and ponding <br /> or trees • Prevent large root systems from damaging subsurface structural components <br /> Once in May and Vegetation growing beyond facility edge onto sidewalks, Edging and trimming of planted areas to control groundcovers and shrubs from overreaching the sidewalks,paths and street <br /> Once in September paths,and street edge edge improves appearance and reduces dogging of permeable pavements by leaf litter,mulch and soil. <br /> Leaves,needles,and In fall(October to Accumulation of organic debris and leaf litter Use leaf blower or vacuum to blow or remove leaves,evergreen needles,and debris(i.e.,flowers,blossoms)off of and away <br /> organic debris December)after leaf from permeable pavement <br /> drop(1-3 times, <br /> depending on <br /> canopy cover) <br /> Frequency:A=Annually;B=Biannually(twice per year);S=Perform inspections after major storm events(24-hour storm event with a 10-year or greater recurrence interval). <br /> b Inspection should occur during storm event. <br /> Volume V—Runoff Treatment BMPs—December 2014 <br /> 4-63 <br />