Environmental Services will repair 430 feet of public sewer pipes and one manhole in North Marine Drive between N Portland Road and N Force Avenue. The pipes and concrete manhole along the southern edge of Marine Drive 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. The 430 feet of sewer pipe and manhole are located along the southern edge of Marine Drive.
Construction could begin as early as July. Work is expected to take about one month to complete.
In general, work will occur from 7 a.m. to 6 p.m. Monday through Friday, and the same hours on Saturday as needed. The sewer pipe repairs will also require one night of work to line the pipe and harden the lining. The pipe lining work will occur from 6 p.m. to 7 a.m.
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. Ultraviolet rays, 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. This work will be completed during regular daytime hours from 7 a.m. to 6 p.m. Monday through Friday, and Saturday if needed.
This project will require temporary traffic diversion during construction. Access to driveways and properties will be provided at all times, although there may be delays. The goal will be to maintain two traffic lanes in each direction during work hours. The sidewalk along the south side of Marine Drive will always be open. If it is necessary for the city's contractor to employ flaggers, pedestrians may be stopped for up to five (5) minutes when necessary for safety.