Environmental Services will repair 100 feet of public sewer pipes and one manhole in North Interstate Place between N Argyle Street and N Willis Boulevard. The pipes and concrete manhole are severely deteriorated from sanitary sewer flows and sewer gases. This project will line the pipes and install a corrosion-proof layer within the manhole. These improvements will help protect public health, water quality, and the Columbia Slough Watershed.
The map below illustrates where sewer repairs will be constructed.
Construction is anticipated to begin as early as July and be completed by the end of December 2018. Once construction begins, work is expected to take about one month to complete.
In general, work will occur 7 a.m. to 6 p.m. Monday through Friday, and the same hours on Saturday as needed.
The specific dates for this project will be determined after a city contractor is hired to do the work.
This project will use trenchless methods to repair the sewer pipes and manhole.
To repair the sewer pipes, the city will employ a method called cured-in-place-pipe lining (CIPP). Work crews access the sewer from manholes to insert a flexible liner inside the old pipe. Hot water or steam inflates and cures the liner, which gradually hardens to form a rigid, smooth surface that seals cracks and restores the pipe to near-new condition. It is generally a three-day process to set up the bypass service, line the pipe, and reinstate the sewer connections to buildings.
People who live and work near a CIPP repair project can sometimes smell a chemical odor during the pipe-lining work. The odor is from the chemical styrene, which is in the resin liner installed inside the pipe. The odor dissipates quickly once the installation process is complete. The amount of airborne styrene produced by the lining process is not expected to cause health issues for workers or the public. Click here for more details about CIPP.
Crews will repair the manhole using a structural fiberglass core layer that will form a smooth, durable, and corrosion resistant wall in the manhole. In addition, crews will patch the bench at the bottom of the manhole with grout to prevent standing water.
Any pavement disturbed by construction will be restored after the pipe and manhole improvements are constructed.
This project will require temporary traffic controls during construction. Local access on N Interstate Place from N Willis Boulevard will be provided at all times. Access to driveways and properties will be provided at all times, although there may be delays. The goal will be to maintain all full-width traffic lanes on N Willis Boulevard and on N Argyle Street during work hours.