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No. 4 — Control Structure/Flow Restrictor <br />Maintenance <br />Component <br />Defect <br />Condition When Maintenance is Needed <br />Results Expected <br />When Maintenance <br />is Performed <br />General <br />Trash and Debris <br />(Includes Sediment) <br />Material exceeds 25% of sump depth or 1 <br />foot below orifice plate. <br />Control structure <br />orifice is not blocked. <br />All trash and debris <br />removed. <br />Structural Damage <br />Structure is not securely attached to <br />manhole wall. <br />Structure securely <br />attached to wall and <br />outlet pipe. <br />Structure is not in upright position (allow up <br />to 10% from plumb). <br />Structure in correct <br />position. <br />Connections to outlet pipe are not watertight <br />and show signs of rust. <br />Connections to outlet <br />pipe are watertight; <br />structure repaired or <br />replaced and works <br />as designed. <br />Any holes --other than designed holes --in the <br />structure. <br />Structure has no <br />holes other than <br />designed holes. <br />Cleanout Gate <br />Damaged or Missing <br />Cleanout gate is not watertight or is missing. <br />Gate is watertight <br />and works as <br />designed. <br />Gate cannot be moved up and down by one <br />maintenance person. <br />Gate moves up and <br />down easily and is <br />watertight. <br />Chain/rod leading to gate is missing or <br />damaged. <br />Chain is in place and <br />works as designed. <br />Gate is rusted over 50% of its surface area. <br />Gate is repaired or <br />replaced to meet <br />design standards. <br />Orifice Plate <br />Damaged or Missing <br />Control device is not working properly due to <br />missing, out of place, or bent orifice plate. <br />Plate is in place and <br />works as designed. <br />Obstructions <br />Any trash, debris, sediment, or vegetation <br />blocking the plate. <br />Plate is free of all <br />obstructions and <br />works as designed. <br />Overflow Pipe <br />Obstructions <br />Any trash or debris blocking (or having the <br />potential of blocking) the overflow pipe. <br />Pipe is free of all <br />obstructions and <br />works as designed. <br />Manhole <br />See "Closed <br />Detention Systems" <br />(No. 3). <br />See "Closed Detention Systems" (No. 3). <br />See "Closed <br />Detention Systems" <br />(No. 3). <br />Catch Basin <br />See "Catch Basins" <br />(No. 5). <br />See "Catch Basins" (No. 5). <br />See "Catch Basins" <br />(No. 5). <br />Volume V — Runoff Treatment BMPs — December 2014 <br />4-37 <br />