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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> M Manhole/ Trash and Debris Trash or debris(in the basin)that exceeds 60 No trash or debris in the catch basin. <br /> Chamber percent of the sump depth as measured from <br /> the bottom of basin to invert of the lowest pipe <br /> into or out of the basin, but in no case less than <br /> a minimum of 6 inches clearance from the debris <br /> surface to the invert of the lowest pipe. <br /> M Manhole/ Trash and Debris Trash or debris in any inlet or outlet pipe Inlet and outlet pipes free of trash or debris. <br /> Chamber blocking more than one-third of its height. <br /> M Manhole/ Trash and Debris Dead animals or vegetation that could generate No dead animals or vegetation present within <br /> Chamber odors that could cause complaints or dangerous the catch basin. <br /> gases (e.g., methane). <br /> M Manhole/ Sediment Sediment(in the basin)that exceeds 60 percent No sediment in the catch basin. <br /> Chamber of the sump depth as measured from <br /> the bottom of basin to invert of the lowest pipe <br /> into or out of the basin, but in no case less than <br /> a minimum of 6 inches clearance from the <br /> sediment surface to the invert of the lowest pipe. <br /> A Manhole/ Structure Damage Top slab has holes larger than 2 square inches Top slab is free of holes and cracks. <br /> Chamber to Frame and/or or cracks wider than one-fourth inch (intent is to <br /> Top Slab make sure no material is running into basin). <br /> A Manhole/ Structure Damage Frame not sitting flush on top slab, i.e., Frame is sitting flush on the riser rings or top <br /> Chamber to Frame and/or separation of more than three-fourth inch of the slab and firmly attached. <br /> Top Slab frame from the top slab. Frame not securely <br /> attached <br /> A Manhole/ Fractures or Cracks Maintenance person judges that structure is Basin replaced or repaired to design <br /> Chamber in Basin Walls/ unsound. standards. <br /> Bottom <br /> A Manhole/ Fractures or Grout fillet has separated or cracked wider than Pipe is re-grouted and secure at basin wall. <br /> Chamber Cracks in Basin one-half-inch and longer than 1 foot at the joint <br /> Walls/Bottom of any inlet/outlet pipe or any evidence of soil <br /> particles entering catch basin through cracks. <br /> Appendices <br /> F-19 <br />