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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Closed Detention Systems (TanksNaults) <br /> Dah <br /> Dnin�ge <br /> System Mainfenanea Aetivlt{ae and Conditions <br /> Frequency Feature � � � ✓ Problem Conditlona to Chr:ck For That Should Exist <br /> M Storage Plugged Air Vents One•half of ihe cross-section ot a vent is Vents open and functioning. <br /> Area blocked at any point or the vent ie demaged. <br /> M Storage Debris and Accumulated sediment depth exceeds 70 All sediment and debris removed trom <br /> Area Sediment pencenl of the diametar of the storage a2a for storage area. <br /> one-half langlh of storage vauR or any point <br /> depth ezceeds 15 percent of diemeter. <br /> (Exemple: 72-inch storage tank would require <br /> Geaning when sediment reaches deplh of 7 <br /> inches for more than one�half length ot tank.) <br /> A Storage Joints Between Any openings or voids allowing material lo be All joint 6etween lanklpipe sections are <br /> Area Tank/Pipe Section transported into facility. (Will requim sealed. <br /> engineering analysis to determina strucWral <br /> stability.) <br /> A Storage Tenk Pipe Bent Any part of tanklpipe is bent out of shape more Tank/pipe repaired or replaced la design. <br /> Area Oul of Shape Nan 10 percent ot its design shape.(Review <br /> required by engineer to determine struclural <br /> stability.) <br /> A Storage Vault Structure Cracks wiAer than one•helf inth and any Vault repleced or repaired to design <br /> Area Includes CraUcs in evidence of soil parUGes entenng Ihe sWdure specificalio�is and is slrudurally sound. <br /> Wall, Bottom, ihrough lhe craGcs,or maintenancelmspection <br /> Damage to Frame pe�scnnel determines that the vaull is not <br /> anNor Top Slab shudurally sou�d. <br /> n Storage Vault Swdure Cracks wider than one-half Inch al the Joint of No cracks more Ihan one•fourth inch wide at <br /> Area Includes Crecks fn eny inleVouUet pipe or any evidence af soil Ihe jomt ol the inleVoutlet pipe. <br /> Wall, Bottom, pertides antering the vault through the walls <br /> C:.mage lo Frame <br /> and/or Top Slab <br /> A Manhole Cover Not in Place Cover is missing or only pertially in place.Any Manhole is closed. <br /> open menhole requires maintenance. <br /> Appendices <br /> F-10 <br />