2600 FEDERAL AVE 2021 PORT OF EVERETT 2025-09-29

5/7/2021 2019SWMMWW-BMP Maintenance Tables Maintenance Defect Condition When Results Expected When Component Maintenance is Needed Maintenance is Performed See Table V-A.3: Maintenance See Table V-A.3: Maintenance See Table V-A.3: Maintenance Manhole Standards - Closed Detention Standards - Closed Detention Standards - Closed Detention Systems (Tanks/Vaults) Systems (Tanks/Vaults) Systems (Tanks/Vaults) Catch Basin See Table V-A.5: Maintenance See Table V-A.5: Maintenance See Table V-A.5: Maintenance Standards - Catch Basins Standards- Catch Basins Standards - Catch Basins Table V-A.5: Maintenance Standards - Catch Basins Results Expected Maintenance Defect Conditions When Maintenance is Needed When Component Maintenance is performed General Trash or debris which is located immediately in front of the No Trash or debris catch basin opening or is blocking inletting capacity of the located basin by more than 10% immediately in front of catch basin or Trash or debris (in the basin)that exceeds 60 percent of the on grate opening. sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less trash or debris in Trash & than a minimum of six inches clearance from the debris n the catch basin. Debris surface to the invert of the lowest pipe. Inlet and outlet Trash or debris in any inlet or outlet pipe blocking more than pipes free of trash 1/3 of its height. or debris. Dead animals or vegetation that could generate odors that No dead animals or could cause complaints or dangerous gases (e.g., methane). vegetation present within the catch basin. Sediment(in the basin)that exceeds 60 percent of the sump depth as measured from the bottom of basin to invert of the lowest pipe into or out of the basin, but in no case less than a No sediment in the Sediment minimum of 6 inches clearance from the sediment surface to catch basin the invert of the lowest pipe. Top slab has holes larger than 2 square inches or cracks wider Top slab is free of i l i i t k t t i t I h 1/4 in ch.nc . (Intent o make sure no material runnn holes and cracks. Structure than ( g Damage to into basin). Frame is sitting Frame and/or Frame not sitting flush on top slab, i.e., separation of more flush on the riser Top Slab than 3/4 inch of the frame from the top slab. Frame not rings or top slab securely attached and firmly attached. Basin replaced or Fractures or Maintenance person judges that structure is unsound. repaired to design Cracks in standards. Grout fillet has separated or cracked wider than 1/2 inch and Basin Walls/ longer than 1 foot at the joint of any inlet/outlet pipe or any Pipe is regrouted Bottom evidence of soil particles entering catch basin through cracks. and secure at basin wall. https://fortress.wa.gov/ecy/ershare/wq/Permits/Flare/2019SWMMWW/2019SWMMWW.htm#TopicsNolumeV/App_BMPMaintenanceTables.htm%3FT... 3/6