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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br />Closed Detention Systems (TanksNaufts) <br />Date <br />Dr��nage <br />System Maintenance Ac4ivities and Conditions <br />Frequency Feature ✓✓✓✓ Problem Conditions to Check For 'fhat 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 sedimertt and debris removed from <br />Area Sediment percent of the diameter of the storage area for storage area. <br />one-half length of storage vaulf or any point <br />depth exceeds 15 percent of diameter. <br />(Exampfe: 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 matenal to be All joint between tanktpipe sections are <br />Area TanklPipe Section transported into facility. (UVili require sealed. <br />engineering analysis to determine structura{ <br />stability.) <br />A Storage Tank Pipe Bent Any part af tank/pipe is bent out of shape more Tanklpipe 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 soif particles entering the structure specifications and is structurally sound. <br />Wall, 8ottom, through the cracks, or maintenancelinspection <br />Qamage to Frame personnel determines thak 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 inleUoutlet 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 manhofe requires rnaintenance. <br />Appendices <br />F-10 <br />