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No. 3—Closed Detention Systems(TanksNaults) <br /> Malntanance Defecl CondlHons When Maintenance is Needod Resulis Expeclod <br /> Componant When Maintanance fs <br /> Parfortned <br /> Slorage Area Plugged Air Venls One-half of the aoss section of a vent is Vents open and <br /> blocked at any point or the vent is damaged. (undioning. <br /> Debris and Sediment Accumulated sedim depth exceeds 10% A�I sediment and <br /> ot�he diameter o(�� �rage area for 12 debris removed from <br /> lengih of slorage v�.. . x any poinl depih storage area. <br /> exceeds 15%of dia; :ter. <br /> (Example:72-inch storage tank wou�d <br /> require cleaning when sediment reaches <br /> depth of 7 inches for more than 12 length of <br /> tank.) <br /> Joints Between Any openings or voids a�lowing material to All joint behveen <br /> TanWPipe Section be transported inlo faality. tank/pipe sections <br /> are sealed. <br /> (Will require engineering analysis to <br /> detertnine sWcturel stability). <br /> TanK Pipe Bent Oul Any paA of tank/pipe is bent out of shape TanWpipe repaired or <br /> of Shape more lhan 10%of its design shape.(Review replaced to design. <br /> required by engineer lo determine structural <br /> stability). <br /> VauItSU ucture Cracks wider than 1/2-inch and any Vault replaced or <br /> InGud�s Crecks in evidence of soil particles entering the repaired to desi9n <br /> Wall, Bottom, structure through ihe cracks,or specifiwiions and is <br /> Damage to Freme mainlenance/inspection personnel sirudurally sound. <br /> and/or Top Slab detertnines lhat lhe vault is not structurally <br /> sound. <br /> Cradcs wider than 12-inch at ihe joint of any o c rades more lhan <br /> inleVoutlet pipe or any evidence of soil 114-inch wide at the <br /> particles entering the vault through the walls. joint of ihe inleVoutlet <br /> pipe. <br /> Manhole Cover Ncl in Place Cover is missing or only partia(ly in place. Manhole is closed. <br /> Any open manhole requires maintenance. <br /> LocF:�ng Mechanism Mechanism wnnol be opened by one Mechanism opens <br /> Not Working maintenance person wilh proper tools. Bolis vnlh proper lools. <br /> inlo frame have less ihan 12 inch of thread <br /> (may not apply to self•locking lids). <br /> Co��er Difficull to One mainlenance person wnnot remove lid Cover can be <br /> Remove aRer applying normal lifling pressure. Intent removed and <br /> is to keep wver from sealing off access to reinsta'!ed by one <br /> maintenance. maintenance person. <br /> Ladder Rungs Unsafe l.adder is unsafe due to missing rungs, Ladder meets design <br /> misalignment, not securely attached to standaMs. Allows <br /> strudum wall, rust,or cracks. maintenance person <br /> safe access. <br /> Caich Basin�. See'Catch Basins' See"Catch Basins'(No.5). See'Catch Basins' <br /> (No. 5) (No.5). <br /> 4-34 Volume V—Runoll Tieatmenl BMPs Febmary 2005 <br />