MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204
Environmental Services is nearing completion of construction on a project to repair public sewer pipes in SW Yamhill and SW Morrison streets in downtown Portland. Repairs to the 100 to 140-year-old, deteriorating sewer pipes will protect the public and the environment by reducing the possibility of sewage releases to buildings and streets.
The remaining pipe work locations in this project include the following:
Construction is anticipated to be completed this fall.
The lining process to repair the sewer pipes cannot be done if there is rain or heavy stormwater flows in the pipes. Although that can be challenging this time of year, the pipe lining process avoids having to dig deep and long trenches in downtown streets to replace whole pipes.
This work was previously scheduled for the week of October 14 but has been re-scheduled for the week of October 28 due to impending rain. Crews will conduct pre- and post-construction video inspections of sewer pipes, install bypass systems, line lateral pipes, and repair the sewer mainline using Cured-in-Place-Pipe Lining at the following location:
The Portland Noise Office granted Environmental Services a Noise Variance to enable the city's contractors to work both days and nights. Daytime construction hours are from 7 a.m. to 6 p.m. Monday through Friday, and Saturdays as needed. Nighttime construction hours are from 6 p.m. to 7 a.m. Monday through Saturday. Night work reduces traffic congestion, creates a safer work zone, and allows sufficient time for a new sewer pipe lining to harden.
Equipment that generates noise includes sewer cleaning trucks, compressors, light trucks, generators, pumps, and ventilation fans. Night work will also require lighting of the work zone.
To repair the public sewer pipes, the City will use the Cured-in-Place-Pipe Lining (CIPP) method. Working from a manhole, crews insert a flexible liner inside the old pipe. Crews then inflate the liner and use hot water, steam, or ultraviolet light to cure the liner, forming a rigid, smooth surface that seals cracks and restores the pipe to near-new condition.
When heat (steam) is used to cure or harden the liner during CIPP, people who are nearby may smell an odor that is often described as being similar to plastic or glue. The odor is from the chemical styrene, which is in the resin of the liner. The resin is the part of the liner that reacts with heat and hardens.
While unpleasant for some, the amount of airborne styrene generated by the CIPP process is not a health risk at the levels observed by the City of Portland and tested and monitored by an independent industrial hygienist. The odor dissipates quickly once the process is complete.
The CIPP sewer pipe lining process occurs in phases:
Click here for more details and photos of the CIPP construction method.
You can expect the following activities and impacts during construction:
Environmental Services strives to keep residents and businesses informed:
Environmental Services coordinates with multiple agencies to schedule and complete construction, minimize disruptions, and help people get to where they are going. Learn about other projects that affect the Central Business District at www.MovePDX.net. To avoid circling around construction to find parking, the City recommends you use SmartPark garages.
Including the project description, map and schedule
Check out current and previous communications about the project