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Alderwood and Cherrywood Sewer Rehabilitation - Trenchless

Vicinity Map

Project Overview: EU-0158

The 2009-2010 Sewer Replacement project consists primarily of replacing manholes and restoring sanitary sewer lines to near new condition through the use of trenchless technology. Eleven manholes will be replaced or rehabilitated and more than 3,800 linear feet of pipe will be repaired using trenchless cured-in-place pipe (CIPP). Of these, six manholes and 1,800 lineal feet are outside the city limits.

CIPP rehabilitates the existing sewer line by inserting a resin coated cloth liner with pressurized steam.  The resin coated liner is then heated with the steam to activate the resin. The hardened resin creates a pipe inside the existing pipe.  Additional information about CIPP is available by following this link:

Update- May 2011

Accomplishments:  Construction substantially complete. Final inspection held on April 21, 2011.

Next Milestones: Complete punchlist and closeout.

Affected Neighborhoods


Project Manager

Nathan Twining, P.E.
Wilson Survey/ Engineering (contracted professional)
Phone: (360) 778-7900
Email Public Works

Project Details

Construction Photographs

Diggins Manholes Spot Repair Replacing Old Manhole Spot Repair Trenchbox

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