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7/9/2021 2019SWMMWW-BMP Maintenance Tables <br /> Table V-A.15: Maintenance Standards - Manufactured Media Filters <br /> Maintenance Defect Condition When Maintenance is Needed Results Expected When <br /> Component Maintenance is Performed <br /> Sediment No sediment deposits which <br /> Accumulation on Sediment depth exceeds 0.25-inches. would impede permeability <br /> Media. of the compost media. <br /> Sediment Sediment depth exceeds 6-inches in first No sediment deposits in <br /> Accumulation in chamber. vault bottom of first <br /> Vault chamber. <br /> Trash/Debris Trash and debris accumulated on compost filter Trash and debris removed <br /> Accumulation bed. from the compost filter bed. <br /> Sediment in Drain When drain pipes, clean-outs, become full with Sediment and debris <br /> Pipes/Clean-Outs sediment and/or debris. removed. <br /> Damaged Pipes Any part of the pipes that are crushed or Pipe repaired and/or <br /> damaged due to corrosion and/or settlement. replaced. <br /> Access Cover Cover cannot be opened; one person cannot Cover repaired to proper <br /> Below Damaged/Not open the cover using normal lifting pressure, working specifications or <br /> Ground Vault Working corrosion/deformation of cover. replaced. <br /> Cracks wider than 1/2-inch or evidence of soil Vault replaced or repairs <br /> particles entering the structure through the made so that vault meets <br /> Vault Structure cracks, or maintenance/inspection personnel design specifications and is <br /> Includes Cracks in determine that the vault is not structurally structurally sound. <br /> Wall, Bottom, sound. <br /> Damage to Frame Vault repaired so that no <br /> and/or Top Slab Cracks wider than 1/2-inch at the joint of any cracks exist wider than 1/4- <br /> inlet/outlet pipe or evidence of soil particles inch at the joint of the <br /> entering through the cracks. inlet/outlet pipe. <br /> Baffles corroding, cracking warping, and/or Baffles repaired or replaced <br /> Baffles showing signs of failure as determined by <br /> maintenance/inspection person. to specifications. <br /> Ladder is corroded or deteriorated, not Ladder replaced or repaired <br /> Access Ladder functioning properly, not securely attached to and meets specifications, <br /> Damaged structure wall, missing rungs, cracks, and and is safe to use as <br /> misaligned. determined by inspection <br /> personnel. <br /> Drawdown of water through the media takes <br /> Below Media longer than 1 hour, and/or overflow occurs Media cartridges replaced. <br /> Ground Cartridge frequently. <br /> Type Short Circuiting Flows do not properly enter filter cartridges. Filter cartridges replaced. <br /> https://fortress.wa.gov/ecy/ershare/wq/Permits/Flare/2019SWMMWW/2019SWMMWW.htm#Topics/VolumeV/App_BMPMaintenanceTables.htm?TocP... 1/1 <br />