8525 EVERGREEN WAY BURGER KING 2021-05-10

No. 22(continued)-Maintenance Standards and Procedures for Permeable Pavement. Recommended Frequency, Component Condition when Maintenance is Needed Action Needed Inspection Routine (Standards) (Procedures) Maintenance Surface/Wearing Course(cont'd) Open-celled paving A or B None(routine maintenance) • Remove sediment,debris,trash,vegetation,and other debris deposited onto pavement(rakes and leaf blowers can be used grid with grass for removing leaves) •Follow equipment manufacturer guidelines for cleaning surface. A n Aggregate is clogged: •Rehabilitate per manufacturer's recommendations. Ponding on surface or water flows off the pemteable pavement surface during a rain event(does not Infiltrate)] A Paving grid missing or damaged • Remove pins,pry up grid segments,and replace grass • Replace grid segments where three or more adjacent rings are broken or damaged •Follow manufacturer guidelines for repairing surface. A Settlement of surface • May require resetting A Poor grass coverage in paving grid •Restore growing medium,reseed or plant,aerate,and/or amend vegetated area as needed •Traffic loading may be inhibiting grass growth;reconsider traffic loading if feasible As needed None(routine maintenance) • Use a mulch mower to mow grass A None(routine maintenance) •Sprinkle a thin layer of compost on top of grass surface(1/2"top dressing)and sweep it in •Do not use fertilizer A Weeds present • Manually remove weeds • Mow,torch,or inoculate and replace with preferred vegetation Inlets/Outlets/Pipes Inlet/outlet pipe A Pipe is damaged Repair/replace A Pipe is clogged Remove roots or debris Underdrain pipe Clean pipe as Clean orifice at least Plant roots,sediment or debris reducing capacity of •Jet clean or rotary cut debris/roots from underdrain(s) needed biannually(may underdrain(may cause prolonged drawdown period) • If underdrains are equipped with a flow restrictor(e.g.,orifice)to attenuate flows,the orifice must be cleaned regularly need more frequent cleaning during wet season) Raised subsurface Clean pipe as Clean orifice at least Plant roots,sediment or debris reducing capacity of •Jet clean or rotary cut debris/roots from underdrain(s) overflow pipe needed biannually(may underdrain • If underdrains are equipped with a flow restrictor(e.g.,orifice)to attenuate flows,the orifice must be cleaned regularly need more frequent cleaning during wet season) Outlet structure A,S Sediment,vegetation,or debris reducing capacity of outlet •Clear the blockage structure • Identify the source of the blockage and take actions to prevent future blockages • 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 intervat). b Inspection should occur during storm event. Volume V—Runoff Treatment BMPs—December 2014 4-62