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Silver Lalce Plaza Table V-4.5.2(14) Maintenance Standards - Sand Filters (Below Ground/Enclosed) Results Expected When Maintenance Defect Condition When Main- Maintenance is Per - Component tenance is Needed formed No sediment deposits on SedimentAccu- sand filter section that mulation on Sediment depth exceeds ,and would impede per- Sand Media Sec 1/2-inch. meability of the filter sec- tion tion. SedimentAccu- Sediment accumulation in mulation in Pre- vault bottom exceeds the No sediment deposits in Settling Portion depth of the sediment zone first chamber of vault. of Vault plus 6-inches. Trash and debris accu- mulated in vault, or pipe Trash and debris removed Trash/Debris inlet/outlet, floatables and from vault and inlet/outlet Accumulation non-floatables. piping. Sediment in When drain pipes, cleanouts Sediment and debris Drain become full with sediment removed. Below Pipes/Cleanoutsandlordebris. Ground Sand filter media section Vault. When seepage/flow occurs re-laid and compacted along perimeter of vault to Short Circuiting along the vaultwalls and form a semi -seal. Erosion corners. Sand eroding near protection added to dis- inflow area. sipate force of incoming flow and curtail erosion. Inlet or outlet piping dam- pipe repaired and/or Damaged Pipes aged or broken and in need replaced. of repair. Cover cannot be opened, corrosion/deformation of Access Cover cover. Cover repaired to proper Damaged/Not working specifications or Working Maintenance person cannot replaced. remove cover using normal lifting pressure. Ventilation area blocked or Blocking material removed Ventilation plugged or cleared from ventilation 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 4 - Page 852 WESTERN ENGINEERS, INC. 40 PROJECT: 15-1415-A