Environmental Services is designing a project to extend the public sewer into NE Gile Terrace and provide service to properties currently served by a nonconforming sewer. This project proposes to construct about 306 feet of public sewer pipe, two manholes, one cleanout, and three service laterals for properties on NE Gile Terrace.
The project will include construction in NE Gile Terrace between NE 22nd Avenue and NE Alameda Street.
Environmental Services continues the design process to determine necessary public sewer improvements and a construction plan. The design process involves extensive coordination with adjacent private properties. The construction timeline has not yet been determined.
During the design process, engineers and Survey crews will be in NE Gile Terrace gathering information to define work locations, select construction methods, and determine underground conditions. Crews will survey and locate utilities, drill holes to take soil and pavement samples, and review street trees with a certified arborist to identify potential impacts and develop a tree protection plan.
Survey crews may place temporary paint markings on the pavement and small flags in yards to mark the locations of pipes and other underground utilities. See the graphic illustration to the right for what the survey colors mean.
These activities generally occur over time rather than all at once. For details on these and other activities that typically occur before construction begins, click here.
Due to the narrow features of NE Gile Terrace, equipment and materials may be stored on NE Alameda Street during sewer investigations and construction of sewer improvements.
Proposed Construction Method
Engineers are proposing to use a trenchless construction method called Horizontal Directional Drilling (HDD). Because this method would avoid digging long trenches to install new sewer pipes, it would minimize impacts to the street, a retaining wall, and landscaping on NE Gile Terrace.
HDD does require some digging, however, including two pits – one called an entrance pit, and another called a receiving pit.
HDD involves the use of a directional drilling machine. Crews insert the drill into the entrance pit and drill a hole underground along a predetermined drill path and depth, grinding and clearing the soil along the path ahead of the stem of the drill. Crews stabilize the hole with drilling fluids. Crews then use equipment to pull the new sewer pipe into the entrance pit and through the path of the drilled hole. Crews complete the HDD process at the receiving pit at the end of the newly installed pipe.
After constructing the sewer improvements, crews restore the excavated entrance and receiving pit areas of the street plus any driveways and curbs that are damaged during construction.
For details on the HDD construction method and to view photos from previous projects, click here.
For More Information
Environmental Services will work directly with the community throughout the course of the project. Community outreach staff will listen to your suggestions and respond to your concerns.
We encourage you to sign up for email updates about the project. Click the SIGN UP button and select NE Gile Terrace Sewer Extension Project from the dropdown menu.
In the event of a sewer backup or basement flooding, call the Maintenance hotline immediately at 503-823-1700. It is staffed all hours and all days, 24/7.