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5/7/2021 2019SWMMWW-BMP Maintenance Tables <br /> Results Expected <br /> Maintenance Defect Conditions When Maintenance is Needed When <br /> Component Maintenance is <br /> performed <br /> Settlement/ If failure of basin has created a safety, function, or design Basin replaced or <br /> Misalignment problem. repaired to design <br /> standards. <br /> No vegetation <br /> Vegetation growing across and blocking more than 10% of the blocking opening to <br /> basin opening. basin. <br /> Vegetation <br /> Vegetation growing in inlet/outlet pipe joints that is more than No vegetation or <br /> six inches tall and less than six inches apart. root growth <br /> present. <br /> Contamination See Table V-A.1: Maintenance Standards- Detention Ponds No pollution <br /> and Pollution present. <br /> Cover/grate is in <br /> Cover Not in Cover is missing or only partially in place. Any open catch place, meets <br /> Place basin requires maintenance. design standards, <br /> and is secured <br /> Catch Basin Locking Mechanism cannot be opened by one maintenance person Mechanism opens <br /> Cover Mechanism with proper tools. Bolts into frame have less than 1/2 inch of with proper tools. <br /> Not Working thread. <br /> One maintenance person cannot remove lid after applying Cover can be <br /> Cover Difficult normal lifting pressure. removed by one <br /> to Remove maintenance <br /> (Intent is keep cover from sealing off access to maintenance.) person. <br /> Ladder meets <br /> design standards <br /> Ladder Ladder Rungs Ladder is unsafe due to missing rungs, not securely attached and allows <br /> Unsafe to basin wall, misalignment, rust, cracks, or sharp edges. maintenance <br /> person safe <br /> access. <br /> Grate opening Grate opening <br /> Unsafe Grate with opening wider than 7/8 inch. meets design <br /> standards. <br /> Trash and Trash and debris that is blocking more than 20% of grate Grate free of trash <br /> Metal Grates Debris surface inletting capacity. and debris. <br /> (If <br /> Applicable) Grate is in place, <br /> meets the design <br /> Damaged or Grate missing or broken member(s) of the grate. standards, and is <br /> Missing. installed and <br /> aligned with the <br /> flow path. <br /> Table V-A.6: Maintenance Standards - Debris Barriers (e.g., Trash Racks) <br /> https://fortress.wa.gov/ecy/ershare/wq/Permits/Flare/2019SWMMWW/2019SWMMWW.htm#TopicsNolumeV/App_BMPMaintenanceTables.htm%3FT... 4/6 <br />