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Table V-4.5.2(5) Maintenance Standards - Catch Basins (continued) <br /> Results <br /> Maintenance Conditions When Maintenance is Expected <br /> Defect When Main <br /> Component Needed <br /> tenance is <br /> performed <br /> Working frame have less than 1/2 inch of thread. proper tools. <br /> One maintenance person cannot remove lid Cover can be <br /> Cover Difficult after applying normal lifting pressure. removed by <br /> one main- <br /> to Remove <br /> (Intent is keep cover from sealing off access tenance per- <br /> to maintenance.) son. <br /> Ladder meets <br /> design stand- <br /> Rungs Ladder Ladder is unsafe due to missing rungs, not ards and <br /> Ladder Unsafe securely attached to basin wall, mis- allows main- <br /> alignment, rust, cracks, or sharp edges. tenance per- <br /> son safe <br /> access. <br /> Grate open- <br /> Grate opening Grate with opening wider than 7/8 inch. ing meets <br /> Unsafe design stand- <br /> ards. <br /> Metal Grates Grate free of <br /> (If Applic- Trash and Trash and debris that is blocking more than trash and <br /> able) Debris 20% of grate surface inletting capacity. debris. <br /> Grate is in <br /> Damaged or Grate missing or broken member(s) of the place and <br /> Missing. grate. meets design <br /> standards. <br /> Table V-4.5.2(6) Maintenance Standards - Debris Barriers (e.g., Trash <br /> Racks) <br /> Maintenance Results Expected <br /> Condition When Maintenance is <br /> Com- Defect When Maintenance is <br /> ponents Needed Performed <br /> Trash or debris that is plugging <br /> General Trash and more than 20% of the openings in Barrier cleared to design <br /> Debris flow capacity. <br /> the barrier. <br /> Metal Damaged/ Bars are bent out of shape more Bars in place with no <br /> Missing than 3 inches. bends more than 3/4 <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 840 <br />