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I <br /> I <br /> I , No 4 Control Structure/Flow Restrictor <br /> lWarntenance Defectt Condition When Mairrtenance is Needed Resuits`t_xpected <br /> - <br /> Component > When Mamtenancs <br /> I ' = _ = 3 isTPerformed <br /> General Trash and Debris Material exceeds 25%of sump depth or 1 Control structure <br /> (Includes Sediment) foot below orifice plate. orifice is not blocked. <br /> I All trash and debris <br /> removed. <br /> Structural Damage Structure is not securely attached to Structure securely <br /> manhole wall. attached to wall and <br /> outlet pipe. <br /> Structure is not in upright position(allow up Structure in correct <br /> . to 10%from plumb). - position. <br /> I Connections to outlet pipe are not watertight Connections to outlet <br /> and show signs of rust. pipe are water tight; <br /> structure repaired or <br /> replaced and works <br /> I as designed. <br /> Any holes--other than designed holes--in the Structure has no <br /> structure. holes other than <br /> designed holes. <br /> I Cleanout Gate Damaged or Missing Cleanout gate is not watertight or is missing. Gate is watertight <br /> and works as <br /> designed. <br /> I Gate cannot be moved up and down by one Gate moves up and <br /> maintenance person. down easily and is <br /> watertight. <br /> I Chain/rod leading to gate is missing or Chain Is in place and <br /> damaged. works as designed. <br /> Gate is rusted over 50%of its surface area. Gate is repaired or <br /> replaced to meet <br /> I design standards. <br /> Orifice Plate Damaged or Missing Control device is not working properly due to Plate is in place and <br /> missing,out of place,or bent orifice plate. works as designed. <br /> I Obstructions Any trash,debris,sediment,or vegetation Plate is free of all <br /> blocking the plate. obstructions and <br /> works as designed. <br /> I Overflow Pipe Obstructions Any trash or debris blocking(or having the Pipe is free of all <br /> potential of blocking)the overflow pipe. obstructions and <br /> works as designed. <br /> Manhole See'Closed See'Closed Detention Systems"(No.3). See"Closed <br /> I Detention Systems"(No.3). Detention Systems" <br /> (No.3). <br /> Catch Basin See°Catch Basins' See"Catch Basins'(No.5). See"Catch Basins" <br /> i <br /> (No.5). (No.5). <br /> I <br /> I <br /> February 2005 Volume V—Runoff Treatment BMPs 4-35 <br /> I <br />