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5/7/2021 2019SWMMWW-BMP Maintenance Tables <br /> Table V-A.3: Maintenance Standards - Closed Detention Systems (Tanks/Vaults) <br /> Results Expected <br /> Maintenance Defect Conditions When Maintenance is Needed When <br /> Component Maintenance is <br /> Performed <br /> Plugged Air Vents One-half of the cross section of a vent is blocked at Vents open an <br /> any point or the vent is damaged. functionin <br /> Accumulated sediment depth exceeds 10% of the 000 <br /> diameter of the storage area for 1/2 length of storage <br /> vault or any point depth exceeds 15% of diameter. All sediment and <br /> Debris a ediment debris removed <br /> (Example: 72-inch storage tank would requir from storage area. <br /> cleaning when sediment reaches depth o ches for <br /> more than 1/2 length of tank.) <br /> Storage Area 7transp <br /> n enings or voids allow' aterial to be <br /> Joints Between into facility. All joint between <br /> Tank/Pipe Section tank/pipe sections <br /> (Will require g analysis to determine are sealed. <br /> structural stab' <br /> Tank Pipe Bent OutX <br /> nk/pipe is be t of shape more than Tank/pipe repaired <br /> Shape sign shape. (Rev equired by or replaced to <br /> etermine structural s ty). design. <br /> Cracks wider than 1/2-inch and any evidence oil Vault replaced or <br /> particles entering the structure through the crack repaired to design <br /> Vault S ure specifications and is <br /> Inc s Cracks in maintenance/inspection personnel determines that ucturally sound. <br /> I, Bottom, Damage the vault is not structurally sound. <br /> to Frame and/or Top Cracks wider than 1/2-inch at the joint of any No s more <br /> Slab inlet/outlet pipe or any evidence of soil particles than 1/ wide <br /> entering the vault through the walls. i the joint <br /> inlet/outlet pipe. <br /> Cover Not in Place Cover is missing or only partially in place. Any open Manhole is closed. <br /> manhole requires maintenance. <br /> Mechanism cannot be opened by one maintenance <br /> Locking Mechanism person with proper tools. Bolts into frame have less Mechanism opens <br /> Not Working than 1/2 inch of thread (may not apply to self-locking with proper tools. <br /> Manhole lids). <br /> Cover can be <br /> Cover Difficult to One maintenance person cannot remove lid after removed and <br /> Remove applying normal lifting pressure. Intent is to keep reinstalled by one <br /> cover from sealing off access to maintenance. maintenance <br /> person. <br /> Ladder meets <br /> Ladder Rungs Unsafe Ladder is unsafe due to missing rungs, misalignment, design standards. <br /> not securely attached to structure wall, rust, or cracks. Allows maintenance <br /> person safe access. <br /> https://fortress.wa.gov/ecy/ershare/wq/Permits/Flare/2019SWMMWW/2019SWMMWW.htm#TopicsNolumeV/App_BMPMaintenanceTables.htm%3FT... 1/6 <br />