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._ c­A;a. _ Gla+a nil/Vinf r S.annratnrc . <br />Maintenance <br />Defect <br />Condition When Maintenance is Needed <br />Results Expected When Maintenance is Performed <br />Component <br />Monitoring <br />Inspection of discharge water for obvious signs of poor water quality. <br />Effluent discharge from vault should be clear with ho thick visible sheen. <br />Sediment depth in bottom of vault exceeds 6-inches in depth and/or visible signs of sediment on <br />No sediment deposits on vault bottom and plate rriedia, which would impede flow <br />Sediment Accumulation <br />plates. <br />through the vault and reduce separation efficiency, <br />Trash and Debris Accumulation <br />Trash and debris accumulated in vault, or pipe inlet/outlet, floatables and non-floatables. <br />Trash and debris removed from vault, and inlet/outlet piping. <br />Oil is extracted from vault using vactoring methods. Coalescing plates are cleaned <br />Oil Accumulation <br />Oil accumulation that exceeds 1-inch at the water surface. <br />by thoroughly rinsing and flushing. Should be no visible oil depth on water. <br />A portion of the media pack or the entire plate pack is replaced depending on sever - <br />Damaged Coalescing Plates <br />Plate media broken, deformed, cracked and/or showing signs of failure. <br />ity of failure. <br />General <br />Damaged Pipes <br />Inlet or outlet piping damaged or broken and in need of repair. <br />Pipe repaired and or replaced. <br />Baffles corroding, cracking, warping and/or showing signs of failure as determined by main- <br />Baffles repaired or replaced to specifications. <br />Baffles <br />tenancefinspeclion person. <br />Cracks widerthan 1/2-inch orevidence of soil particles entering the structure through the cracks, <br />Vault replaced or repairs made so that vault meets design specifications and is <br />Vault Structure Damage- Includes Cracks in <br />or maintenance/inspection personnel determine that the vault is not structurally sound. <br />structurally sound. <br />Walls, Bottom_, Damage to Frame and/or Top <br />Cracks wider than 1/2-inch at the joint of any inlet/outlet pipe or evidence of soil particles enter- <br />Vault repaired so that no cracks exist widerthan 1-/4-inch at the joint of the <br />Slab <br />ing through the cracks. <br />inlet/outlet pipe. <br />Ladder is corroded or deteriorated, not functioning properly, not securely attached to structure <br />Ladder replaced or repaired and meets specifications, and is safe to use as determ- <br />Access Ladder Damaged <br />wall, missing rungs, cracks, and misaligned. <br />ined by inspection personnel. <br />w w o. wx—:..a,.....--- _ Ca+rH Racin Incartc <br />Maintenance Component <br />Defect <br />Conditions When Maintenance is Needed <br />Results Expected When Maintenance is Performed <br />Sediment Accumulation <br />When sediment forms a cap over the insert media of the insert and/or unit. <br />No sediment,cap on the insert media and its unit. <br />Trash and Debris Accumulation <br />Trash and debris accumulates on insert unit creating a blockage/restriction. <br />Trash and debds removed from insert unit. Runoff freely flows into catch basin. <br />Media Insert Not Removing Oil <br />Effluent waterfrom media insert has a visible sheen. <br />Effluent water from media insert is free of oils and has no visible sheen. <br />General <br />Media Insert Water Saturated : <br />Catch basin insert is saturated with water and no longer has the capacity to absorb. <br />Remove and replace media insert <br />Media Insert -Oil Saturated <br />Media oil saturated due to petroleum spill that drains into catch basin. <br />Remove and replace media insert. <br />Media Insert Use Beyond Product Life <br />Media has been used beyond the typical average life of media insert product. <br />Remove and replace media at regular intervals, depending on insert product. <br />Ta Hie v-n 4U. Maintenance Standards - Media Filter Drain IMFD1 <br />Maintenance <br />Component <br />Defect <br />Conditions When Maintenance is Needed <br />Results Expected When Maintenance is Performed <br />Sediment <br />Remove sediment deposits on grass treatment area of the embankment. When finished, embank - <br />accumulation <br />Sediment depth exceeds 2 inches or creates uneven grading that interferes with sheet flow. <br />ment should be level from side to side and drain freely toward the toe of the embankment slope. <br />General <br />on grass filter <br />There should be no areas of standing water once inflow has ceased. <br />strip <br />No -vegetation <br />Flow spreader is uneven or clogged so that flows are not uniformly distributed over entire embankment width. <br />Level the spreader and clean to spread flows evenly over entire embankment width. <br />2019 Stormwater Management Manual for Western Washington <br />Volume V -Appendix A - Page 1017 <br />