Environmental Services continues to design a project in the southern portion of Sunnyside to install, replace, and upsize approximately 9,000 feet of public sewer pipes. Environmental Services will also build 25 green street planters to manage stormwater runoff from streets, roofs, and parking lots. The sewer and stormwater improvements will increase sewer capacity, manage stormwater more naturally, and reduce the risks of street flooding and sewage releases to homes, businesses, and streets.
Check out the project website to see a map showing the pipe and green street locations, as well as construction methods: www.portland.gov/bes/SunnysideSouth
Construction is not anticipated to start until winter of 2021 at the earliest. Engineers are finishing up the design, and planting plans are being collected from adjacent property owners for the green street planters.
The city plans to use two different methods to construct this project.
- Open trench excavation is the most traditional and most common method of sewer construction. This method consists of excavating down to, and exposing, the existing pipe (if there is one), so that it can be installed, repaired, or replaced. The trench is then backfilled and temporarily paved until the pipe is quality control tested.
- Cured-in-Place Pipe Lining (CIPP) is a trenchless method of sewer construction. It requires little or no digging and significantly less time to complete than other sewer repair methods. CIPP involves inserting a flexible liner inside the existing pipe, inflating the liner, and exposing it to heat or ultraviolet light to “cure,” or harden the liner inside the pipe.
There is more information about these construction methods at www.portlandoregon.gov/bes/methods.