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Table V-A.S:Maintenance Standards-Catch Basins Maintenance Defect Conditions When Maintenance is Needed Results Expected When Maintenance is per- Component formed Trash or debris which is located immediately in front of the catch basin opening or is blocking inletting capacity of the basin by morethan 10%. No Trash or debris located immediately in front of Trash ordebris(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 catch basin won grate opening. basin,but in no case less than a 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 8 Debris Trash or debris in a inlet oroutlet blocking more than 113 of its height.n11 Pipe �J 9 Inlet and outlet pipes free of trash or debris. 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 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 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 Genera To slab has holes la erthan 2 square inches or cracks widerthan 1/4 inch.(Intent is to make sure no material is running into basin Top slab is free of holes and cracks. Structure Damage to P r9 q 9 )� Frame and/or Top Slab Frame not sitting flush on top slab,i.e.,separation of more than 314 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 longerthan 1 foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering Pipe is regrouted and secure at basin wall. catch basin through cracks. Settlement/Mis- If failureof basin has created a safety,function,or design problem. Basin replaced or repaired to design standards. alignment Vegetation Vegetation growing across and blocking more than 10%of the basin opening No vegetation blocking opening to basin. Vegetation growing in inlettoutlet pipe joints that is more than six inches tall and less than six inches apart. No vegetation or root growth present. Contamination and Pol- See Table V-A.1:Maintenance Standards-Detention Ponds No pollution present. lution Cover Not in Place Cover is missing oronly partially in place.Any open catch basin requires maintenance. Cover/grate is in place,meets design standards, and is secured Catch Basin Locking Mechanism Mechanism cannot be opened by one maintenance person with proper tools.Bolts into frame have less than 112 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 meets design standards and allows main- Ladder Ladder Rungs Unsafe Ladder is unsafe due to missing rungs,not securely attached to basin wall,misalignment,rust,cracks,or sharp edges. tenance person safe access. Grate opening Unsafe Grate with opening widerlhan 7/8 inch. 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. Gmtemissing orbroken member(s)ofthe gmte. is installed and aligned with the flow path.