Environmental Services will begin construction late summer on the Sellwood-Moreland Sewer Repair Project. The project will replace about 25,000 feet of public sewer pipes that are between 84 and 104 years old and failing due to age. The work will include repairing about 5,000 feet of existing service laterals that connect houses and businesses from the curb to the public sewer in the street, and constructing 1,360 feet of new service laterals. This project will help protect the public and the environment by reducing the possibility of costly breaks, leaks, blockages and sewage releases to homes, businesses and streets. Work is expected to be complete by fall 2015.
The map below shows the location of pipes we will repair or replace. There may be temporary traffic controls, construction signage or increased traffic volume and parking on nearby streets.
What to Expect During Construction
The following are answers to some of the most frequently asked questions we receive from neighbors about construction:
- Start date: The city is in the process of hiring a construction contractor. Construction will begin in late summer 2014. You may see city staff or contractors in your neighborhood surveying, trimming trees, setting up traffic control signage, staging equipment, and marking and moving utility lines to prepare for the start of construction. Moving utility lines often requires digging up part of a street.
- Work hours: Typical construction hours will be 7:00 a.m. to 6:00 p.m. Monday through Friday. If needed, the contractor may work the same hours on Saturday. The contractor will work at night to complete the cured-in-place pipe lining on larger pipes in several locations (see map). We will notify residents in advance of night work.
- Expected impacts: Construction will create noise, vibration, dust and traffic impacts. Also, equipment and materials may need to be stored on some city streets.
- Traffic: Expect traffic delays. The contractor will set up traffic control signs and flaggers may direct traffic on higher-volume streets. Orange signs and barricades reading “ROAD CLOSED to Thru Traffic – Local Access Only” are intended to reduce overall traffic going through the area while construction is underway, but anyone who lives in or needs to conduct business within the construction zone will be allowed access.
- Parking: On-street parking in or near the work area will be prohibited during work hours and you may be delayed getting to your driveway. Please plan to move your vehicle by 7:00 a.m.
- Planting strip and sidewalks: Sewer construction generally occurs in the street. However, in a few areas the contractor will have to cut into sidewalks or driveway edges then restore the areas. Construction may also affect the planting strip, or the area between the curb and sidewalk. We will notify property owners where this may occur.
- Advance notice: We will post doorhanger notices a few days before work starts on your street. Keep in mind that schedules are always subject to change due to weather, supply availability, or other issues in the field.
- Sewer and water service: During construction, the city’s contractor will use by-pass pumps to maintain sewer service. If a short, temporary water service shut-off is necessary to relocate a line, the contractor will notify property owners in advance.
- Construction duration: Construction near an individual property could last a few weeks. This may seem longer where the work extends on the same street for a block or more. Sewer construction has many phases, and there may be periods of inactivity between construction phases at each site.
- Safety: Safety is our top priority for every construction site. You can help keep the area safe by staying clear of all construction activities and keeping children, pets and vehicles out of construction areas. A city inspector will be on-site during work hours and may be able to assist you with construction concerns.
Sewer Construction Methods
The city will use a combination of open trench construction, cured-in-place-pipe lining (CIPP), and pipe bursting. The contractor may use more than one construction method in some areas. For example, the contractor may use CIPP on the main public sewer pipe and open trench construction to repair or replace laterals that connect private sewers from the curb to the public sewer in the street.
Open trench installation is done in phases:
- Saw cut pavement along the width of the trench
- Remove pavement and existing material
- Install public sewer pipe in the street
- Backfill trench with sand or gravel
- Replace laterals that connect private sewers to the system (from the curb to the street)
- Restore surface temporarily with an asphalt patch
- Complete final paving
- Restore other areas disturbed by construction, such as sidewalks, driveway aprons and planting strips
Cured-in-place-pipe lining (CIPP) doesn’t require digging a trench. Work crews access the sewer from manholes to insert a flexible liner inside the old pipe. 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. People who live and work near a CIPP repair project 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 is not a human health risk.
Pipe bursting involves digging an access pit and inserting a bursting head into the existing sewer line. The bursting head breaks the old pipe apart and pulls the new pipe into place behind it. Construction crews retrieve the bursting head from a second access pit.
For More Information
Contact Amy Higgs at 503-975-7073. During construction, we will be sending regular email updates to keep you posted about the schedule, construction activities, possible traffic detours and delays, parking restrictions and other impacts.
Send an email to Amy Higgs with “Sellwood-Moreland” in the subject line to receive project updates by email.