3003 W CASINO RD BOEING PARKING LOTS - E 6 2025-07-25

I I Table 3.2.5 Maintenance of Control Structures and Catchbasins Maintenance Results Expected When Component Defect Condition When Maintenance is Needed Maintenance is Performed General Trash& Trash or debris which is located immediately in No Trash or debris located Debris front of the catch basin opening or is blocking immediately in front of catch basin or inletting capacity of the basin by more than 10%. on grate opening. Trash or debris(in the basin)that exceeds 60 No trash or debris in the catch basin. percent of the sump depth as measured from the I bottom of basin to invert of the lowest pipe into or out of the basin,but in no case less than a minimum of six inches clearance from the debris surface to the invert of the lowest pipe. Trash or debris in any inlet or outlet pipe blocking Inlet and outlet pipes free of trash or more than 1/3 of its height. debris. Dead animals or vegetation that could generate No dead animals or vegetation odors that could cause complaints or dangerous present within the catch basin. gases(e.g.,methane). Sediment Sediment(in the basin)that exceeds 60 percent of No sediment in the catch basin. the sump depth as measured from the bottom of I basin to invert of the lowest pipe into or out of the basin,but in no case less than a minimum of 6 inches clearance from the sediment surface to the invert of the lowest pipe. Measured from the bottom of basin to invert of the lowest pipe into or out of the basin. Structure Top slab has holes larger than 2 square inches or Top slab is free of holes and cracks. Damage to cracks wider than 1/4 inch. Frame and/or Top (Intent is to make sure no material is running into Slab basin). Frame not sitting flush on top slab,i.e., Frame is sitting flush on the riser separation of more than 3/4 inch of the frame from rings or top slab and firmly attached. the top slab.Frame not securely attached Fractures or Maintenance person judges that structure is Basin replaced or repaired to design Cracks in unsound. standards. Basin Walls/ Bottom Grout fillet has separated or cracked wider than Pipe is regrouted and secure at basin 1/2 inch and longer than 1 foot at the joint of any wall. inlet/outlet pipe or any evidence of soil particles entering catch basin through cracks. Settlement/ If failure of basin has created a safety,function,or Basin replaced or repaired to design Misalignme design problem. standards. nt I Vegetation Vegetation growing across and blocking more than No vegetation blocking opening to 10%of the basin opening. basin. Vegetation growing in inlet/outlet pipe joints that No vegetation or root growth present. is more than six inches tall and less than six inches apart. Contaminati See"Detention Ponds". No pollution present. on and Pollution Volume III—Hydrologic Analysis and Flow Control BMPs—August 2012 3-56 I