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No. 3— Closed Detention Systems {TanksNaults) <br />Mnintennnce Defacl Condltlons Whon Malntunanca I� Needod Resultt Expectad <br />Component When Melnlonance 1� <br />Parto�ned <br />Slorage Area Plugged Nr Vents One-half ot tho cross seclion of a ven� is Venis o{,�� � ond <br />blocked at any poin� or ihe vent is damaged. fundioning. <br />Debris anA : iont Aaumulaled sediment depth ezceeds 10�o All sedimenl end <br />ol lho diame�er of the slor�go area for 1!2 debns removed from <br />lenc7lh o� slora�e vault or »ny poin� depih storage area. <br />�xceods 15% of diame�er. <br />(Example: 72-inch storagc lank would <br />requir� cleaning whcn sedimenl reaches <br />deplh of 7 inches lor rnore �han 1/2 length ot <br />tank.) <br />Joinis ��Iween Any openings or voids allowing malerial to All Joint between <br />Tank/Pipa Sedion be Iransported inlo lacility. lank/pi�e sec�ions <br />uro sealed. <br />(Will require enyiner,ring analysis �o <br />dulr.rmino struclural slabildy). <br />Tank Pipe ��nl Out Any part of �ank/pipo is ben� oul of shape ?anklpipe repaired or <br />of Sf�ape more lhan 10% of fis desi�n shape. (Review rPnlaced lo desi�n. <br />required by ongineer !o d�lermine strudural <br />stabilily). <br />V�ult Slrur.turo Cr�cks wider then V2-inch end any Veult roplaced or <br />Inr,ludes Cracks in ovidence ol soil parlides entenng �hb repaired to design <br />Wall, Bo�lorn, sUur.ture �hrough Iho r.racks, or specifcations und is <br />Uamege �o Frame m�intenance/inspection personnel s�rucLirally sound. <br />end/or Top Slab delermines Ihal lhe vault is not strucWrelly <br />sound. <br />Cracks widm than 1/2�inch al �ho Join� ol eny No cracks more �han <br />inleUoullot pipe or any evidenc� ol soil 1/4-inch wlde nl lhe <br />padicles entoring Ihe vaull lhrough Ihe wal�s. �oi�� ol lhe InleUoullel <br />pipe <br />Manhnle Covor Not in Place Cover is missinc� or only partielly in place. Manhole is closed. <br />Any open manholc� requires mainlenonce. <br />Lockinc� Mechanl;m Mochanism cannot be opened by ono Mechanism �ens <br />Nol Workiny mainlena�ce person with proper tools. Bolts with proper tools. <br />inb frame have less then 1/2 inch of Ihread <br />jmay nol apply to scl6locki�p Ilds). <br />Covar Ditficull lo One mainlenance person cannot remove lid Cover can be <br />Remrne after applying nomial �iRing pressuro. Intent removod �nd <br />is lo keep cover from saaling ofl access la reinstallod by one <br />m�intenance, maintenance person. <br />LadJer Rungs Unsafe LaAder Is unsafe due �o missing rungs, LadAer mee�s design <br />misalignment, nol securely attached to standards. Altows <br />slrur.tura wall, rust, or crecks. maintenance porson <br />safe access. <br />Catch 6aslns See "Cetch Basins' See'Catch Bnsins' (No. 5). See'Catch Bas!ns" <br />(No. Cil (No. 5). <br />-� --_ . ._-- -- ---------- - ----- -� ---._._.— - <br />4-34 l%olurne V-- Runo/l T.•eatmen; BMPs August 20U1 <br />SB <br />