Sewer Lining Activities at Avenue Station - Bypass Installation & Lining Operations

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October 12, 2017

SEWER LINING AT AVENUE STATION

The entire sewer lining process will take approximately 4 – 6 weeks to complete.

Sewer bypass work takes place in the daytime construction hours.

Sewer lining work takes place on a 24 hour schedule.

WHAT WORK IS TAKING PLACE?

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.

WHY USE THE CIPP PROCESS FOR SEWER LINING?

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 without excavating the entire sewer up through the road.

 

SEWER BYPASS

As early as October 18, 2017, and takes approximately 3 weeks to complete.

7AM – 11PM, depending on work location, hours of work will be adjusted for peak periods. 

  • For one large combined sanitary and storm sewer, an above ground temporary bypass pipe will be installed to divert flow while lining work happens underground. 
  • Some sections of the bypass pipe will be located in the roadway and will be placed in a trench temporarily covered by metal plates until the sewer lining is complete.
  • There are 8 different locations for the trenches along Eglinton between Braemar and Lascelles, including locations on Avenue Road. Crews will return to each location after the work is completed to restore the roadway.
  • Some on-street parking spaces will be temporarily unavailable during this work.

 

SEWER LINING

As early as October 23, 2017, and takes approximately 3 weeks to complete.

A continuous 24 hour process, each section takes approximately 3 days to complete.

  • Crews use existing maintenance holes on either end of the sewer section to complete the underground work. 
  • Work zones will be set up to accommodate the machinery used to insert the flexible lining membrane, including a generator, boiler, compressor and sometimes a hydro-vacuum truck. Specialized equipment such as high-pressure generators, robot cameras, and robot cutters are sent into the sewer to set and cure the liner.
  • 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.
  • Lane reductions are expected to accomodate this work.

 

THE SMELL OF SEWER LINING RESIN

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.

 

WHAT TO EXPECT

  • 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.