Costa Mesa Sewer Rehabilitation Along the I-405

Along the 405 Project

Starting the week of March 17, OC San will begin driveway and access improvements within an existing easement. This work follows the removal of trees on February 26 and aims to widen the gate opening and realign the driveway for safer access to a critical manhole structure. Currently, maintenance vehicles must navigate tight turns, often requiring them to back up dangerously close to an unprotected flood control channel. These improvements will enhance safety and efficiency, ensuring OC San crews can continue their essential work maintaining wastewater infrastructure without unnecessary hazards. 

Upcoming Work: Brookview Community

OC San will be working in the Brookview Community at the northwest corner near Lassen Lane, as shown in the graphic below:

• What: Video footage of the inside of the sewer pipeline. This is in preparation of future sewer rehabilitation work. Continue reading the “Future Work” section.
• When: As early as March 13
• Hours: Between the hours of 8 a.m. and 5 p.m., lasting approximately 2 hours
• Impacts: No impacts are anticipated.

• What: Demolition and removal of vegetation, asphalt, curb, concrete pad, a section of wall, and an existing gate. Light poles and signage will be temporarily removed and reinstalled once work is complete.
• When:  Week of March 17 and lasting approximately 1 week
• Hours:  Monday – Friday, 8 a.m. – 5 p.m.
• Impacts:
  • Designated parking spaces will be unavailable during working hours. Signage will be posted – please move vehicles to avoid any damage or possible towing.
  • Increased construction activity and noise levels are expected.

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

We appreciate your patience and cooperation as we work to improve and maintain the sewer infrastructure in your community.

Street view of OC San easement area within the Brookview Community.

Copy of original notice is available here.

Future Work

Please continue reading to learn more about future work and where it will be located. More information will be provided as the work approaches and schedules are confirmed.

LOCATION: Pacific Arts Plaza on Park Center Drive to the Brookview Community

What: Sewer line rehabilitation work crossing under the 405 freeway

When: Anticipated to start as early as March 24, 2025, and lasting approximately 3 weeks

What to Expect:

• A temporary sewer bypass system will be installed. It will be removed when the work is completed.
• Temporary above-ground piping will be placed along the work area, limiting access to the grass area in Brookview Community.
• Increased noise due to construction activity.
• Some temporary odors may be noticeable in the area.
• Bypass pumps will be set up and used only when the sewer bypass system is turned on.

LOCATION: Bear Street from South Coast Plaza to The Palazzo by Khoshbin

What: Sewer line rehabilitation work crossing under the 405 freeway

When: Anticipated to occur April 2025

LOCATION: Pacific Arts Plaza on Park Center Drive

What: Manhole access improvements

When: Anticipated to occur Spring 2025