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11 <br /> I <br /> No. 5—Catch Basins <br /> IMaintenance Defect Conditions When Maintenance is Needed Results Expected When <br /> Component Maintenance is <br /> performed <br /> I General Trash& Trash or debris which is located immediately No Trash or debris located <br /> Debris in front of the catch basin opening or is immediately in front of <br /> blocking inletting capacity of the basin by catch basin or on grate <br /> I more than 10%. opening. <br /> Trash or debris (in the basin)that exceeds 60 No trash or debris in the <br /> percent of the sump depth as measured from catch basin. <br /> the bottom of basin to invert of the lowest <br /> I pipe into or out of the basin, but in no case <br /> less than a minimum of six inches clearance <br /> from the debris surface to the invert of the <br /> lowest pipe. <br /> I Trash or debris in any inlet or outlet pipe Inlet and outlet pipes free <br /> blocking more than 1/3 of its height. of trash or debris. <br /> Dead animals or vegetation that could No dead animals or <br /> generate odors that could cause complaints vegetation present within <br /> Ior dangerous gases (e.g., methane). the catch basin. <br /> Sediment Sediment(in the basin)that exceeds 60 No sediment in the catch <br /> percent of the sump depth as measured from basin <br /> I the bottom of basin to invert of the lowest <br /> pipe into or out of the basin, but in no case <br /> less than a minimum of 6 inches clearance <br /> from the sediment surface to the invert of the <br /> i <br /> lowest pipe. <br /> Structure Top slab has holes larger than 2 square Top slab is free of holes <br /> Damage to inches or cracks wider than 1/4 inch and cracks. <br /> I Frame and/or (Intent is to make sure no material is running <br /> Top Slab into basin). <br /> Frame not sitting flush on top slab, i.e., Frame is sitting flush on <br /> separation of more than 3/4 inch of the frame the riser rings or top slab <br /> from the top slab. Frame not securely and firmly attached. <br /> attached <br /> Fractures or Maintenance person judges that structure is Basin replaced or repaired <br /> 1 Cracks in unsound. to design standards. <br /> Basin Walls/ <br /> Bottom <br /> Grout fillet has separated or cracked wider Pipe is regrouted and <br /> I than 1/2 inch and longer than 1 foot at the secure at basin wall. <br /> joint of any inlet/outlet pipe or any evidence of <br /> soil particles entering catch basin through <br /> cracks. <br /> I Settlement/ If failure of basin has created a safety, Basin replaced or repaired <br /> Misalignment function, or design problem. to design standards. <br /> Vegetation Vegetation growing across and blocking more No vegetation blocking <br /> I than 10%of the basin opening. opening to basin. <br /> Vegetation growing in inlet/outlet pipe joints No vegetation or root <br /> that is more than six inches tall and less than growth present. <br /> six inches apart. <br /> IContamination See"Detention Ponds"(No. 1). No pollution present. <br /> and Pollution <br /> I Volume V—Runoff Treatment BMPs—August 2012 <br /> 4-37 <br /> I <br />