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Table V-A.6: Maintenance Standards - Debris Barriers (e.g., Trash Racks) Maintenance Components Defect Condition When Maintenance is Needed Results Expected When Maintenance is Performed General Trash and Debris Trash or debris that is plugging more than 20%of the openings in the barrier. Barrier cleared to design flow capacity. Bars are bent out of shape more than 3 inches. Bars in place with no bends more than 3/4 inch. Damaged/Missing Bars. Bars are missing or entire barrier missing. Bars in place according to design. Metal Bars are loose and rust is causing 50%deterioration to any part of barrier. Barrier replaced or repaired to design standards. Inlet/Outlet Pipe Debris barrier missing or not attached to pipe Barrier firmly attached to pipe Table V-A.7: Maintenance Standards - Energy Dissipators Maintenance Com- Defect Conditions When Maintenance is Needed Results Expected When Maintenance is ponents Performed External: Missing or Moved Rock Only one layer of rock exists above native soil in area five square feet or larger, or any exposure of native soil. Rock pad replaced to design standards. Rock Pad Erosion Soil erosion in or adjacent to rock pad. Rock pad replaced to design standards. Pipe Plugged with Sediment Accumulated sediment that exceeds 20%of the design depth. Pipe cleaned/flushed so that it matches design. Not Discharging Water Properly Visual evidence of water discharging at concentrated points along trench(normal condition is a"sheet flow"of water along trench). Trench redesigned or rebuilt to standards. Intent is to prevent erosion damage. Dispersion Trench Perforations Plugged. Over 1/2 of perforations in pipe are plugged with debris and sediment. Perforated pipe cleaned or replaced. 99 P p p p 99 p�p P Water Flows Out Top of"Distributor" Maintenance person observes or receives credible report of water flowing out during any storm less than the design storm or its causing Facility rebuilt or redesigned to standards. Catch Basin. or appears likely to cause damage. Receiving Area Over-Saturated Water in receiving area is causing or has potential of causing landslide problems. No danger of landslides. I nternal: Worn or Damaged Post, Baffles, Side Structure dissipating flow deteriorates to 1/2 of original size or any concentrated worn spot exceeding one square foot which would Structure replaced to design standards. Manhole/Chamber of Chamber make structure unsound. Other Defects See Table V-A.5: Maintenance Standards-Catch Basins See Table V-A.5: Maintenance Standards- Catch Basins 2019 Stormwater Management Manual for Western Washington Volume V-Appendix A -Page 1010