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No. 5 — Catch Basins <br />Maintenance <br />Component <br />Defect <br />Conditions When Maintenance is Needed <br />Results Expected When <br />Maintenance is <br />performed <br />General <br />Trash & <br />Debris <br />Trash or debris which is located immediately <br />in front of the catch basin opening or is <br />blocking inletting capacity of the basin by <br />No Trash or debris located <br />immediately in front of <br />catch basin or on grate <br />more than 10%. <br />opening. <br />Trash or debris (in the basin) that exceeds 60 <br />percent of the sump depth as measured from <br />the bottom of basin to invert of the lowest <br />No trash or debris in the <br />catch basin. <br />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 />Trash or debris in any inlet or outlet pipe <br />blocking more than 1/3 of its height. <br />Inlet and outlet pipes free <br />of trash or debris. <br />Dead animals or vegetation that could <br />generate odors that could cause complaints <br />or dangerous gases (e.g., methane). <br />No dead animals or <br />vegetation present within <br />the catch basin. <br />Sediment <br />Sediment (in the basin) that exceeds 60 <br />percent of the sump depth as measured from <br />the bottom of basin to invert of the lowest <br />No sediment in the catch <br />basin <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 />lowest pipe. <br />Structure <br />Damage to <br />Top slab has holes larger than 2 square <br />inches or cracks wider than 1/4 inch <br />Top slab is free of holes <br />and cracks. <br />Frame and/or <br />Top Slab <br />(Intent is to make sure no material is running <br />into basin). <br />Frame not sitting flush on top slab, i.e., <br />separation of more than 3/4 inch of the frame <br />from the top slab. Frame not securely <br />Frame is sitting flush on <br />the riser rings or top slab <br />and firmly attached. <br />attached <br />Fractures or <br />Cracks in <br />Maintenance person judges that structure is <br />unsound. <br />Basin replaced or repaired <br />to design standards. <br />Basin Walls/ <br />Bottom <br />Grout fillet has separated or cracked wider <br />than 1/2 inch and longer than 1 foot at the <br />joint of any inlet/outlet pipe or any evidence of <br />soil particles entering catch basin through <br />Pipe is regrouted and <br />secure at basin wall. <br />cracks. <br />Settlement/ <br />Misalignment <br />If failure of basin has created a safety, <br />function, or design problem. <br />Basin replaced or repaired <br />to design standards. <br />Vegetation <br />Vegetation growing across and blocking more <br />than 10% of the basin opening. <br />No vegetation blocking <br />opening to basin. <br />Vegetation growing in inlet/outlet pipe joints <br />that is more than six inches tall and less than <br />No vegetation or root <br />growth present. <br />six inches apart. <br />Contamination <br />See "Detention Ponds" (No. 1). <br />No pollution present. <br />and Pollution <br />Volume V — Runoff Treatment BMPs — December 2014 <br />4-38 <br />