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Table V-A.5:Maintenance Standards-Catch Basins co Maintenance Results Expected When Maintenance Is per- ,-3 Defect Conditions When Maintenance Is Needed [i1 Component formed Trash or debr is which is located immediately in front of the catch basin opening or is blocking inletting capacity of the basin by more than 10%. No Trash or debris located immediately in front of 0 zTrash or debris(in the basin)that exceeds 60 percent of the sump depth measured from the bottom of basin to Invert of the lowest pipe into or out of the catch basin Oran grate opening. 1-3 0 basin,but in no case less thane minimum of six inches clearance from the debris surface to the invert of the lowest pipe. No trash or debris In the catch basin. Trash&Debris Trash or debris in any inlet or outlet pipe blocking more than 1/3 of its height. Inlet and outlet pipes free of trash or debris. ft Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases(e.g.,methane). No dead animals or vegetation present within the rn catch basin. Sediment(in the basin)that exceeds 60 percent of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the n Fri Sediment basin,but in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe. No sediment in the catch basin X General To slab hasolesi erthan25 einchesorcrackswiderthan1/4Inch.(Intentistostakesurenomaterialisinto basin. Topslabisitreeofhdesandcracks. Structure Damage to P ar9 square running ) Frame andlorTop Slab Frame not sitting flush on top slab,I.e.,separation of more than 3/4 Inch of the frame from the top slab.Frame not securely attached Frame is sitting flush on the riser rings or top slab and firmly attached. Maintenance person judges that structure is unsound Fractures or Cracks in Basin replaced or repaired to design standards. Basin Walls!Bottom Grout fillet has separated or cracked wider than 1/2 inch and longer than 1 foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering Pipe Is regtnoded and secure at basin wall. catch basin through cracks. Settlement/Mis- If failure of basin has created a safety,function,or design problem. Basin replaced or repaired to design standards. alignment Vegetation growing across and blocking more than 10%of the basin openng. No vegetation docking opening to basin. Vegetation Vegetation growing in inlet/outlet pipe joints that is more than six inches tall and less than six inches apart. No vegetation or root growth present. Contamination and Pdi- See Table V-A.1:Maintenance Standards-Detention Ponds No pollution present i� lotion N Cover Not in Place Cover is missing or only partially in place.Any open catch basin requires maintenance_ Cover/grate Is In place,meets design standards, and Is secured Catch Basin Locking Mechanism Mecharism cannot be opened by one maintenance person with proper tools.Bolts into frame have less than 1/2 inch of thread. Mechanism opens with proper tools_ Cover Not Working Cover Difficult to One maintenance person cannot remove lid after applying normal lifting pressure. Cover can be removed by one maintenance per- Remove (Intent is keep cover from sealing off access to maintenance.) son. Ladder Ladder Rungs Unsafe Ladder is unsafe due to missing rungs,not securely attached to basin wall,misalignment,rust,cracks,or sharp edges. Ladder meets design standards and allows main- tenance person safe access. Grate operang Unsafe Grate with opening wider than?/8inch. Grate opening meets design standards. Metal Grates Trash and Debris Trash and debris that is blocking more than 20%of grate surface inletting capacity. Grate free of trash and debris. (If Applicable) Grate is in place,meets the design standards,and Damaged or Missing. Grate missing or broken member(s)of the grate. is Installed and aligned with the flow path. 'v Pa O Q cc N do