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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Control Structure/Flow Restrictor <br /> Date <br /> Drainage <br /> System . Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> M General Trash and Debris Material exceeds 25 percent of sump depth or 1 Control structure orifice is not blocked. All <br /> (Includes foot below orifice plate. trash and debris removed. <br /> Sediment) <br /> A General Structural Damage Structure is not securely attached to manhole Structure securely attached to wall and outlet <br /> wall. pipe. <br /> A General Structural Damage Structure is not in upright position (allow up to Structure in correct position. <br /> 10 percent from plumb). <br /> A General Structural Damage Connections to outlet pipe are not watertight and Connections to outlet pipe are water tight; <br /> show signs of rust. structure repaired or replaced and works as <br /> designed. <br /> A General Structural Damage Any holes—other than designed holes—in the Structure has no holes other than designed <br /> structure. holes. <br /> A Cleanout Damaged or Cleanout gate is not watertight or is missing. Gate is watertight and works as designed. <br /> Gate Missing <br /> A Cleanout Damaged or Gate cannot be moved up and down by one Gate moves up and down easily and is <br /> Gate Missing maintenance person. watertight. <br /> A Cleanout Damaged or Chain/rod leading to gate is missing or Chain is in place and works as designed. <br /> Gate Missing damaged. <br /> A Cleanout Damaged or Gate is rusted over 50 percent of its surface Gate is repaired or replaced to meet design <br /> Gate Missing area. standards. <br /> A Orifice Damaged or Control device is not working properly due to Plate is in place and works as designed. <br /> Plate Missing missing, out of place, or bent orifice plate. <br /> M'S Orifice Obstructions Any trash, debris, sediment,or vegetation Plate is free of all obstructions and works as <br /> Plate blocking the plate. designed. <br /> M'S Overflow Obstructions Any trash or debris blocking (or having the Pipe is free of all obstructions and works as <br /> Pipe potential of blocking)the overflow pipe. designed. <br /> A Manhole Cover Not in Place Cover is missing or only partially in place.Any Manhole is closed. <br /> open manhole requires maintenance. <br /> Appendices <br /> F-12 <br />