Costa Mesa Sewer Rehabilitation Along the I-405

This project is continuing with sewer rehabilitation work. We appreciate your patience as this work is being done to enhance the aging infrastructure to extend the life of the regional sewer system another 25-30 years.

In certain areas, above ground piping and bypass pumps have been installed to temporarily reroute sewer flows, allowing rehabilitation work to occur without interrupting sewer service to the community.  Upcoming work includes pipeline cleaning, pre-inspection, rehabilitation, and post-inspection.  

Rehabilitation work will be done using the cured-in-place-pipe (CIPP) method.  More information about CIPP is listed at the end. 

Hours:  Monday – Friday, 7 a.m. – 4 p.m., with the exception of CIPP Work Hours

CIPP Work Hours: 24/7 continuous uninterrupted work hours

Impacts:  

• Increase in activity and noise levels from construction vehicles and equipment.
• Generator noise from bypass pumps. Noise barrier will enclose the bypass pump area to reduce the transmission of noise.
• Some odors may be noticeable in the immediate area but are temporary.

CIPP SCHEDULE

🚧STREETS NEAR WORK AREA:  Bear Street, Olympic Avenue, Tanana Place

There will be two separate CIPP segments. One segment is near Olympic Avenue and Bear Street. The second is near Bear Street and Tanana Place.

When:  June 16 – 20, 2025 – COMPLETED

🚧STREETS NEAR WORK AREA:  Concord Street, Tanana Place, Yukon Avenue

When:  June 25 – 28, 2025*

🚧STREETS NEAR WORK AREA:  Fairview Road, Charleston Street

When:  June 30 – July 3, 2025*

Additional Information:  Work will be taking place within Gisler Park.  The park will remain open but there may areas that will be restricted.   

🚧STREETS NEAR WORK AREA:  South Coast Drive, San Leandro Lane, Concord Street

The sewer pipeline crossing under the 405 freeway will be rehabilitated. Vactor trucks will be used to vacuum wastewater out of the pipeline from a nearby manhole to keep flows out of the section of pipe that will be rehabilitated.

When:  One night only, anticipated to occur in July.  Exact date will be provided when schedule is confirmed.

Hours: 9 p.m. – 6 a.m.

*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 through a manhole opening into the existing pipeline. After the liner has been inserted, it is filled with water that is heated to a certain temperature and cured for several hours. 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.