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STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN <br /> Table III-2.10 Maintenance of Control Structures and Catchbasins <br /> Maintenance Defect Conditions When Maintenance is Results Expected When Maintenance <br /> Component Needed is Performed <br /> I. Control Structure/ <br /> Flow Restrictor- <br /> General Trash&Debris(includes Distance between debris buildup& All trash&debris removed. <br /> sediment) bottom of orifice is <1 rfr feet. <br /> Structural Damage Structure is not securely attached to Structure securely attached to wall& <br /> manhole wall&outlet pipe structure outlet pipe. <br /> should support at least 10000 of up or <br /> down pressure. <br /> Structure is not in upright position(up Structure in correct position. <br /> to 10%from plumb allowed). <br /> Connections to outlet pipe are not Connections to outlet pipe are <br /> watertight&show signs of nut watertight;structure repaired or <br /> replaced and works as designed. <br /> Any holes-other than designed Structure has no holes other than <br /> holes-in structure. designed holes. <br /> Cleanout Gate Damaged or missing Cleanout gate is not watertight or is Gate is watertight and works as <br /> missing. designed. <br /> Gate cannot be moved up&down by Gate moves up and down easily and <br /> one maintenance person. is watertight. <br /> • <br /> Chain leading to gate is missing or Chain is in place&works as <br /> damaged. designed. <br /> Gate is rusted over 50%of its surface Gate is repaired or replaced to meet <br /> area. design standards. <br /> Obstructions Trash,debris,sediment or vegetation Plate is free of all obstructions& <br /> blocking the plate. works as designed. <br /> Overflow Pipe Obstructions Trash or debris is blocking or Pipe is free of all obstructions& <br /> potentially blocking the overflow pipe. works as designed. <br /> Manhole See'Pipee/Tanks'standard,Section See"Pipes/Tanks'standard,Section <br /> III-4.6.1. 111.4.6.1. <br /> II.Catchbasins- Trash&Debris(includes Trash&debris z rh ft.3 which is No trash or debris immediately in <br /> General sediment) located immediately in front of the front of the catchbasin opening. <br /> catchbasin opening of is blocking <br /> capacity by >10%. <br /> Trash or debris in the basin that No trash or debris in the catchbasin. <br /> exceeds lb the depth from the bottom <br /> of basin to the invert of the lowest <br /> Pte. <br /> Trash or debris in any inlet or pipe Inlet&outlet pipes free of trash or <br /> blocking more than K of its height. debris. <br /> Dead animals or vegetation that could No dead animals or vegetation <br /> generate odors or dangerous gases present within the catchbasin. <br /> (e.g.methane). <br /> III-2-67 FEBRUARY, 1992 <br />