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1221 SW 4th Ave, Suite 110, Portland, OR 97204

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South Ash Creek sewer repair project - construction update 11/1/13

Hello Ash Creek Neighbors

As you know, the South Ash Creek sewer repair project will repair a segment of sewer pipe near Ash Creek and remove the temporary bypass pipe that has been in place for several years. Construction on this project is ongoing. The new sewer line will reduce the risk of backups or overflows, and will result in the removal of both the above and below ground segments of the bypass pipe. When construction is complete, re-vegetation of the main staging area will be completed.

A project map is available at


  • Sewer construction crews are on-site.
  • Much of the work on private property in the project area has been completed.
  • The excavation at the staging area (the BES site), which involves drilling through a thick layer of rock and which can be loud, is scheduled to be completed by the end of next week.
  • The sewer pipe is scheduled to be lined using CIPP lining beginning next Wednesday (see below for more information about the CIPP process). Crews are planning on working Wednesday-Saturday to complete the lining.
  • After the CIPP lining is complete, crews will repair several manholes and prepare to remove the bypass pipe.
  • The re-vegetation team will begin working on site in the next several weeks.


  • We have heard questions about sewer service to homes during construction; sewer service should not be interrupted as we are working in the neighborhood.
  • We received a question about wetland protection and erosion control, with regard to the backfill around newly installed sewer pipes. The project requires that some gravel be used to secure the pipe in the ground, and then we are using native materials (soils) to fill the rest of the trench. This is expected to protect both the pipe and the adjacent wetland.


Construction is ongoing. Work on the entire project may last through the end of January, 2014, but is tentatively scheduled to be completed in mid-late December.


For much of the work, the contractor will use a trenchless repair method called cured-in-place pipe-lining (CIPP). The CIPP process doesn’t require digging a trench and minimizes construction impacts. Work crews use manholes or other access points to insert a flexible line inside the old pipe. Hot water or steam pumped into the sewer flattens the lining against the inside of the old pipe. The liner gradually hardens for form a rigid, smooth surface, Construction crews will access the pipe via several temporary construction easements along the project alignment. We will only be lining the sewer main line, and not the laterals that service individual properties.

You may smell a chemical odor during the CIPP lining work. The odor is from a chemical called styrene in the resin liner installed inside the pipe. The odor dissipates quickly once installation is complete. The amount of airborne styrene the repair process produces is not a human health risk. We will let you know when the CIPP lining will take place.

There will also be about 350 feet of open trench excavation at the west end of the project area to install new pipe. This will take place on land owned by the City of Portland.


-Construction will create noise, vibration and dust and may disrupt normal neighborhood activity.

-Work hours are 7:00 a.m. to 6:00 p.m. Monday through Friday. The contractor may schedule work during the same hours on Saturdays.

-Traffic control will be in place, and you may be delayed traveling into, out of, or through the work area.

-On-street parking in or near the work area may be prohibited during work hours.

-Equipment and materials may be secured and stored on nearby streets overnight.

-You will have sewer service at all times, even when work is near your home.

-There may be periods of inactivity between construction phases.

-A city construction inspector will be on-site during work hours, and may be able to assist you with construction concerns. Inspectors typically wear a safety vest and hard hat.

This email is one in a series of weekly email updates I will provide throughout construction. As always, please feel free to share this email with anyone who may be interested. If you would like to be removed from the list, please let me know.


Thank you for your interest in this important sewer project. If you have any additional questions, please feel free to email me at, or head to the project website



Becky Tillson

Community Outreach and Information

City of Portland Environmental Services

1120 SW 5th Ave, Room 1000, Portland, Oregon 97204

Phone: 503-823-2827 l Cell Phone: 803-823-6615


Working for clean rivers

Over one-third of Portland’s 2,500 miles of sewer pipes are more than 80 years old. Projects to replace or repair aging sewers are important for protecting water quality, public health and the environment. Learn more at

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