Environmental Services is designing a project that will install and upsize public sewer pipes, as well as construct green street planters, in the southern portion of the Sunnyside neighborhood. These improvements will increase sewer capacity, relieve sewer backups, and reduce street flooding.
Project Area
The map below illustrates where this project will construct sewer improvements and green street planters. This map also shows what methods of construction are proposed as well as where all of the new ADA ramps will be built.
We Want to Hear from You
Please let us know if you have any questions regarding the sewer pipes or green street planters. Be sure to include your name, property address, and project name (Sunnyside South) in your voicemail and email so we can provide you more details about what to expect in front of your property. Also, please write “Sunnyside South” in the subject line of your email.
Construction Methods
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.
For more information about construction methods, go to www.portlandoregon.gov/bes/methods.
Project Background
The purpose of this project is to relieve basement sewer backup risk, reduce street flooding, and overall risk to the large sewer trunk in the project area. To that end, this project will upsize or repair portions of the public sewer main line to increase its capacity to handle combined sewer and stormwater. It will also build green street planters that help slow, filter, and cleanse stormwater from the streets.
The project is designed to accomplish the following sewer and stormwater improvements:
Replace or repair 9,000 feet of public sewer mainline pipe, ranging in size from 8 inches to 21 inches in diameter.
Construct or replace 228 sewer service laterals that connect private sewer lines to the public sewer in the street; this will involve 3,700 feet of lateral sewer pipe.
Install almost 800 feet of pipe for stormdrains.
Install or replace 137 stormdrains.
Construct 25 green street planters.
Construct or replace 137 manholes.
Construct 44 ADA ramps.
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