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Stormwater Maintenance Checklists Maintenance Checklist for Closed Detention Systems (Pipes/Tanks) Frequency Drainage Systems Feature  (  Problem  Conditions To Check For  Conditions That Shall Exist  M Storage area (pipe tank)  Plugged air vents (small pipe that connects catch basin to storage pipe) One-half of the end area of vent is blocked at any point with debris and sediment. Plugged vent can cause storage area to collapse Vents free of debris and sediment.  M   Debris and sediment Accumulated sediment depth exceeds 15% of diameter. Example: 72-inch storage tank would require cleaning when sediment reaches depth of 10 inches. All sediment and debris removed from storage area. Contact City Public Works for guidance on sediment removal and disposal.  A   Joints between tank/pipe section Any crack allowing material to leak into facility. All joints between tank/pipe sections are sealed.  A   Tank/pipe bent out of shape Any part of tank/pipe is noticeably bent out of shape. Tank/pipe repaired or replaced to design. Contact a professional engineer for evaluation.  M, S Manhole  Cover not in place Cover is missing or only partially in place. Any open manhole requires maintenance. Manhole is closed.  A   Locking mechanism not working Mechanism cannot be opened by one maintenance person with proper tools. Bolts into frame have less than ½ -inch of thread (may not apply to self-locking lids). Mechanism opens with proper tools.  A   Cover difficult to remove One maintenance person cannot remove lid after applying 80 pounds of lift. Intent is to keep cover from sealing off access to maintenance. Cover can be removed and reinstalled by one maintenance person.  A   Ladder rungs unsafe Maintenance person judges that ladder is unsafe due to missing rungs, misalignment, rust or cracks. Ladder meets design standards and allows maintenance persons safe access.   If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Key A = Annual (March or April preferred) M = Monthly (see schedule) S = After major storms Maintenance Checklist for Catch Basins and Inlets Frequency Drainage Systems Feature  (  Problem  Conditions To Check For  Conditions That Should Exist  M, S General  Trash, debris, and sediment in or on basin Trash or debris in front of the catch basin opening is blocking capacity by more than 10%. No trash or debris located immediately in front of catch basin opening. Grate is kept clean and allows water to enter.  M    Sediment or debris (in the basin) that exceeds 1/3 the depth from the bottom of basin to invert of the lowest pipe into or out of the basin. No sediment or debris in the catch basin. Catch basin is dug out and clean.  M, S    Trash or debris in any inlet or pipe blocking more than 1/3 of its height. Inlet and outlet pipes free of trash or debris.  M   Structural damage to frame and/or top slab Corner of frame extends more than ¾ inch past curb face into the street (if applicable). Frame is even with curb.  M    Top slab has holes larger than 2 square inches or cracks wider than ¼ inch (intent is to make sure all material is running into the basin). Top slab is free of holes and cracks.  M    Frame not sitting flush on top slab, i.e., separation of more than ¾ inch of the frame from the top slab. Frame is sitting flush on top slab  A   Cracks in basin walls/bottom Cracks wider than ½ inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that structure is unsound. Basin replaced or repaired to design standards. Contact a professional engineer for evaluation.  A    Cracks wider than ½ inch and longer than 1 foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering catch basin through cracks. No cracks more than ¼ inch wide at the joint of inlet/outlet pipe.  A   Settlement/ misalignment Basin has settled more than 1 inch or has rotated more than 2 inches out of alignment. Basin replaced or repaired to design standards. Contact a professional engineer for evaluation.   M, S   Fire hazard or other pollution Presence of chemicals such as natural gas, oil, and gasoline. Obnoxious color, odor, or sludge noted. No color, odor, or sludge. Basin is dug out and clean.  M, S   Outlet pipe is clogged with vegetation Vegetation or roots growing in inlet/outlet pipe joints that is more than six inches tall and less than six inches apart. No vegetation or root growth present.  If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Key A = Annual (March or April preferred) M = Monthly (see schedule) S = After major storms Maintenance Checklist for Infiltration Systems Frequency Drainage System Feature  (  Problem  Conditions To Check For  Conditions That Should Exist  M, S General  Trash & debris in pond See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds.  M   Poisonous vegetation See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds.  M, S   Fire hazard or pollution See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds.  M   Vegetation See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds.  M   Rodent holes See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds.  M   Insects See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds.  A Storage area  Sediment buildup in system A soil texture test indicates facility is not working at its designed capabilities or was incorrectly designed. Sediment removed and facility cleaned so infiltration system works. Sediment trapping area installed to reduce sediment transport  A   Storage area drains slowly (more than 48 hours) or overflows A soil texture test indicates facility is not working at its designed capabilities or was incorrectly designed. Additional volume is added through excavation to provide needed storage. Soil is aerated and rototilled to improve drainage. Contact the City for information on its requirements regarding excavation.  M   Sediment trapping area Any sediment and debris filling area to 10% pf depth from sump bottom to bottom of outlet pipe or obstructing flow into the connector pipe. Clean out sump to design depth.  One Time   Sediment trapping area not present Stormwater enters infiltration area directly without treatment. Construct a sump for settling of solids. Segregate settling area from rest of facility.  M Rock filters  Sediment and debris By visual inspection little or no water flows through filter during heavy rain storms. Replace gravel in rock filter.  If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Key A = Annual (March or April preferred) M = Monthly (see schedule) S = After major storms Maintenance Checklist for Conveyance Systems (Pipes, Ditches, and Swales) Frequency  Drainage System Feature  (  Problem  Conditions To Check For  Conditions That Should Exist  M, S Pipes  Sediment & debris Accumulated sediment that exceeds 20% of the diameter of the pipe. Pipe cleaned of all sediment and debris.  M   Vegetation Vegetation that reduces free movement of water through pipes. All vegetation removed so water flows freely through pipes.  A   Damaged (rusted, bent, or crushed) Protective coating is damaged; rust is causing more than 50% deterioration to any part of pipe. Pipe repaired or replaced.  M    Any dent that significantly impedes flow (i.e., decreases the cross section area of pipe by more than 20%). Pipe repaired or replaced.  M    Pipe has major cracks or tears allowing groundwater leakage. Pipe repaired or replaced.  M, S Open ditches  Trash & debris Dumping of yard wastes such as grass clippings and branches into basin. Unsightly accumulation of non-degradable materials such as glass, plastic, metal, foam, and coated paper. Remove trash and debris and dispose as prescribed by City Waste Management Section.  M   Sediment buildup Accumulated sediment that exceeds 20% of the design depth. Ditch cleaned of all sediment and debris so that it matches design.  A   Vegetation Vegetation (e.g., weedy shrubs or saplings) that reduces free movements of water through ditches. Water flows freely through ditches. Grassy vegetation should be left alone.  M   Erosion damage to slopes See Ponds Checklist. See Ponds Checklist.  A   Rock lining out of place or missing (if applicable) Maintenance person can see native soil beneath the rock lining. Replace rocks to design standard.  Varies Catch basins   See Catch Basins Checklist. See Catch Basins Checklist.  M, S Swales  Trash & debris See above for Ditches. See above for Ditches.   M, S Swales  Trash & debris See above for Ditches. See above for Ditches.  M   Sediment buildup See above for Ditches. Vegetation may need to be replanted after cleaning.  M   Vegetation not growing or overgrown Grass cover is sparse and weedy or areas are overgrown with woody vegetation. Aerate soils and reseed and mulch bare areas. Maintain grass height at a minimum of 6 inches for best stormwater treatment. Remove woody growth, recontour, and reseed as necessary.  M, S   Erosion damage to slopes See Ponds Checklist. See Ponds Checklist.  M   Conversion by homeowner to incompatible use Swale has been filled in or blocked by shed, woodpile, shrubbery, etc. If possible, speak with homeowner and request that swale area be restored. Contact City to report problem if not rectified voluntarily.  A   Swale does not drain Water stands in swale or flow velocity is very slow. Stagnation occurs. A survey may be needed to check grades. Grades need to be in 1-5% range if possible. If grade is less than 1%, underdrains may need to be installed.   If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance. Comments: Key A = Annual (March or April preferred) M = Monthly (see schedule) S = After major storms