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r <br /> No.5—Catch Basins <br /> Maintenance Defect Conditions When Maintenance is Needed` Results Expected When <br /> Component Maintenance is performed <br /> Ladder Ladder Rungs Ladder is unsafe due to missing rungs, Ladder meets design <br /> Unsafe cracked/broken rungs,rungs not securely attached standards and allows <br /> to basin wall,misalignment,rust,cracks,or sharp maintenance person safe <br /> edges. access. <br /> Metal Grates Trash and Trash and debris that is blocking more than 20% Grate free of trash and <br /> (If Applicable) Debris of grate surface inletting capacity. debris. <br /> Damaged or Grate missing or broken member(s)of the grate. Grate is in place and meets <br /> Missing. design standards. <br /> No.6—Debris Barriers(e.g.,Trash Racks) <br /> Maintenance Defect .Condition When Maintenance is Needed Results Expectg <br /> compo . , �, Maintenance is�Per 1"rimed <br /> General Trash and Trash or debris that is plugging more than Barrier cleared to design flow <br /> Debris 20%of the openings in the barrier. capacity. <br /> Metal Damaged/ Bars are bent out of shape more than 3 Bars in place with no bends more <br /> Missing Bars. inches. than 3/4 inch. <br /> Bars are missing or entire barrier missing. Bars in place according to design. <br /> Bars are loose and rust is causing 50% Barrier replaced or repaired to design <br /> deterioration to any part of barrier. standards. <br /> Inlet/Outlet Debris barrier missing or not attached to pipe Barrier firmly attached to pipe <br /> Pipe <br /> January 2016 Snohomish County Drainage Manual Volume V-Runoff Treatment BMPs 32 <br />