REPOST & UPDATE: Avenue Station Sewer Lining

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November 15, 2017

Original Issue Date: October 14, 2017
Repost & Update Date: November 15, 2017


Beginning as early as November 20, 2017.

Sewer lining work takes place on a 24 hour schedule.


To increase the durability of local sewers during mining operations at Avenue Station, sewer sections in the vicinity of station construction zones will be lined using the Cured-In-Place Pipe (CIPP) process.


  • A new work zone will be set up in the roadway at the west end of the existing construction site around the primary access maintenance hole. The work zone will be used to accommodate the machinery used to insert the flexible lining membrane into the sewer, including a generator, boiler, compressor and sometimes a hydro-vacuum truck. This will be permanently in place for approximately 2 - 3 weeks.
  • This new work zone will reduce the available lanes of traffic on Eglinton to one in each direction. Some on street parking on the south side of Eglinton between Highbourne Avenue and Oriole Parkway will be impacted during this work.
  • Periodically the new work zone will be required to extend west to Avenue Road during the overnight periods from 8:00 PM to 6:00 AM. Some parking spaces on the north side of Eglinton may be impacted during the periodic nightly work zone extensions.
  • Short duration temporary lane closures will be required at other manholes as crews pull the lining through each sewer section. Additional manholes on the south side of Eglinton are located on Highbourne Avenue and Oriole Parkway. Additional manholes on the north side of Eglinton are partially within our existing construction zone and are located at Oriole Parkway and just west of Eastbourne Avenue. 
  • Lining operations will temporarily seal property sanitary lines to the main sewer. There may be short durations during the work when local residents and businesses will be advised to refrain from water usage. Affected properties will be provided notice at least 24 hours in advance. 


The CIPP process is a minimally invasive method of sewer repair and rehabilitation that is commonly used throughout the City of Toronto. Using this process allows us to complete the work through existing maintenance holes without excavating the entire sewer up through the road.
  • The CIPP process for sewer lining work uses a synthetic resin called styrene. 
  • When the resin is heated during the curing process, it has a very distinct chemical smell, sometimes described as bitter-sweet. While the smell is unpleasant, it is not harmful. 
  • You can prevent/minimize the odour from reaching your property by ensuring that you have water in your plumbing P-traps and floor drains. You may also wish to cover the floor drain with a wet cloth and place a flat heavy object over the drain.
  • For more information on styrene, please visit the Styrene used in Cured In Place Pipe Relining page on the City of Toronto Environmental Health website.
  • Residents and businesses near the work zone can expected to hear noise from generators, compressors, hydro-vacuum trucks, and other construction equipment. 
  • An unpleasant chemical odour may be noticeable during the sewer lining work, both in the vicinity of the work zone and sometimes in the buildings connected to the sewer being worked on. It is not harmful.
  • In very rare occasions, during the cleaning and preparation process, air pressure in the sewer can cause water to splash out through toilets, sinks or floor drains.  While this is highly unlikely, you can prevent any instance of it occurring by taking the following precautions: 
    • Close the lids on all toilet bowls when not in use.
    • Insert drain plugs in all sinks and bathtubs when not in use.
    • If you have a float plug in your floor drain or a backwater valve installed in your house, ensure that it is free of debris and operating properly.
    • Wrap the cover of your basement floor drains with plastic (i.e. a freezer bag). Place something heavy over the floor drains to keep the plastic covered floor drain covers in place.