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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 />Catch Basin <br />Cover <br />Cover Not in <br />Place <br />Cover is missing or only partially in place. <br />Any open catch basin requires maintenance. <br />Catch basin cover is <br />closed <br />Locking <br />Mechanism <br />Not Working <br />Mechanism cannot be opened by one <br />maintenance person with proper tools. Bolts <br />into frame have less than 1/2 inch of thread. <br />Mechanism opens with <br />proper tools. <br />Cover Difficult <br />to Remove <br />One maintenance person cannot remove lid <br />after applying normal lifting pressure. <br />Cover can be removed by <br />one maintenance person. <br />(Intent is keep cover from sealing off access <br />to maintenance.) <br />Ladder <br />Ladder Rungs <br />Unsafe <br />Ladder is unsafe due to missing rungs, not <br />securely attached to basin wall, <br />misalignment, rust, cracks, or sharp edges. <br />Ladder meets design <br />standards and allows <br />maintenance person safe <br />access. <br />Metal Grates <br />(If Applicable) <br />Grate opening <br />Unsafe <br />Grate with opening wider than 7/8 inch. <br />Grate opening meets <br />design standards. <br />Trash and <br />Debris <br />Trash and debris that is blocking more than <br />20% of grate surface inletting capacity. <br />Grate free of trash and <br />debris. <br />Damaged or <br />Missing. <br />Grate missing or broken member(s) of the <br />grate. <br />Grate is in place and <br />meets design standards. <br />No. 6 Debris Barriers (e.g., Trash Racks) <br />Maintenance <br />Components <br />Defect <br />Condition When Maintenance is <br />Needed <br />Results Expected When <br />Maintenance is Performed <br />General <br />Trash and <br />Debris <br />Trash or debris that is plugging more <br />than 20% of the openings in the barrier. <br />Barrier cleared to design flow <br />capacity. <br />Metal <br />Damaged/ <br />Missing <br />Bars are bent out of shape more than 3 <br />inches. <br />Bars in place with no bends more <br />than 3/4 inch. <br />Bars. <br />Bars are missing or entire barrier <br />Bars in place according to design. <br />missing. <br />Bars are loose and rust is causing 50% <br />deterioration to any part of barrier. <br />Barrier replaced or repaired to <br />design standards. <br />Inlet/Outlet <br />Debris barrier missing or not attached to <br />Barrier firmly attached to pipe <br />Pipe <br />pipe <br />Volume V — Runoff Treatment BMPs —December 2014 <br />4-39 <br />