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1 MI O - - V O i M 1 MI N 1 - r M - E MO <br /> CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Closed Detention Systems (TanksNaults) <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature V V ✓ V Problem Conditions to Check For That Should Exist <br /> M Storage Plugged Air Vents One-half of the cross-section of a vent is Vents open and functioning. <br /> Area blocked at any point or the vent is damaged. <br /> M Storage Debris and Accumulated sediment depth exceeds 10 All sediment and debris removed from <br /> Area Sediment percent of the diameter of the storage area for storage area. <br /> one-half length of storage vault or any point <br /> depth exceeds 15 percent of diameter. <br /> (Example:72-inch storage tank would require <br /> cleaning when sediment reaches depth of 7 <br /> inches for more than one-half length of tank.) <br /> A Storage Joints Between Any openings or voids allowing material to be All joint between tank/pipe sections are <br /> Area Tank/Pipe Section transported into facility. (Will require sealed. <br /> engineering analysis to determine structural <br /> stability.) <br /> A Storage Tank Pipe Bent Any part of tank/pipe is bent out of shape more Tank/pipe repaired or replaced to design. <br /> Area Out of Shape than 10 percent of its design shape.(Review <br /> required by engineer to determine structural <br /> stability.) <br /> A Storage Vault Structure Cracks wider than one-half inch and any Vault replaced or repaired to design <br /> Area Includes Cracks in evidence of soil particles entering the structure specifications and is structurally sound. <br /> Wall, Bottom, through the cracks,or maintenance/inspection <br /> Damage to Frame personnel determines that the vault is not <br /> and/or Top Slab structurally sound. <br /> A Storage Vault Structure Cracks wider than one-half inch at the joint of No cracks more than one-fourth inch wide at <br /> Area Includes Cracks in any inlet/outlet pipe or any evidence of soil the joint of the inlet/outlet pipe. <br /> Wall, Bottom, particles entering the vault through the walls <br /> Damage to Frame <br /> and/or Top Slab <br /> A Manhole Cover Not in Place Cover is missing or only partially in place.Any Manhole is closed. <br /> open manhole requires maintenance. <br /> Appendices <br /> F-10 <br />