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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204

More Contact Info

Construction Methods

Open trench excavation will be necessary in order to repair or replace storm drain inlets, manholes and up to 100 feet of service laterals that connect private properties to the public sewer. Historic trolley rails will also be removed where they intersect the sewer at NW Flanders and 12th and the service laterals on Flanders.Map of work area

This project will repair the 100-year-old sewer pipe using a trenchless construction method called cured-in-place-pipe lining. Work crews access the sewer from manholes on 11th and 12th Avenues 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.

Click here for photos and more information about these construction methods.