• What:  Pipeline rehabilitation by lining the pipe using the cured-in-place-pipe (CIPP)  method. This work will occur in several segments.
• When:  Starting the week of September 23, lasting approximately 1 week
• Work Hours:  CIPP activities will require 24/7 continuous work
• What to Expect:
  • Some odors from the CIPP curing process may be noticeable in the immediate area but are temporary
  • Traffic control in work areas
  • Increase in activity and noise levels
  • Bypass pumps will be used to bypass wastewater flows from the pipeline into the temporary bypass piping that was recently installed.
  • Sound attenuation will be placed around the pumps to mitigate noise
  • Gisler Park bike path closed from Fairview Ave

LOCATION: Susan St and South Coast Dr (IKEA parking lot) to Gisler Ave

• What: Sewer line rehabilitation work crossing under the 405 freeway
• When: As early as week of September 23, lasting approximately one day, date to be confirmed
• Work Hours: Starting at 9 p.m. and requiring 24/7 continuous work until completed
• Impacts: Same as above

*All dates and times are subject to change due to operational factors or inclement weather.

About Cured-in-Place Pipe (CIPP)

A pre-measured liner is delivered in a refrigerated truck and inserted into the existing pipeline through manhole openings.  After the liner has been inserted, it is filled with water that is heated to a certain temperature, and cured for several hours to harden the liner inside the pipe. When fully cured, the liner now acts as the new pipeline. Once the CIPP operation begins, it cannot be stopped until completed, thus requiring the 24/7 continuous work. Crews will be onsite for monitoring throughout the entire process.

Project Description:

This upcoming project will rehabilitate approximately 4 miles of the regional sewer pipeline that runs along the I-405 freeway in the City of Costa Mesa.

Project elements include the rehabilitation of gravity sewer pipelines using the cured-in-place pipe method, manhole structure rehabilitation, and manhole access improvements. The project also includes the rehabilitation of four sewer pipelines that cross the I-405 freeway.  (yellow line)

A nearby project also in the City of Costa Mesa is the Airway-Airport Loop Sewer Rehabilitation Project. (blue line)

Construction Schedule: 

Summer 2024 and lasting approximately 1.5 years.

Work will be done in phases (segments) so as not to affect the entire project alignment at once.

Keep Informed:

Continue to follow this page as construction is anticipated to start on the project in the next several months.  Sign up for e-notifications to stay informed about this project by subscribing and selecting the “Costa Mesa Sewer Along the I-405” subscription topic.

Other Information: 

For information about nearby OC San construction work in the City of Costa Mesa, please visit Airway-Airport Loop Sewer Rehabilitation.