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25th Avenue Sanitary Sewer Relief Line
Project Name: 25th Avenue Sanitary Sewer Relief Line Project  
Impacted Areas
  • 25th Avenue: Flores Street to South Delaware Street (front entrance of County Event Center) (Left and Right turn lanes to El Camino Real)
  • El Camino Real: Intersection of El Camino Real and 25th Avenue (Left and Right turn lanes to 25th Avenue)

Project Construction Duration: 6 months

Work Hours:  8:00pm - 5:00am, Sunday - Friday

Short Description of Work:  The 25th Avenue Sanitary Sewer Relief Line Project (Project) site is located along 25th Avenue between Flores Street and South Delaware Street in the City of San Mateo.  The project includes the construction of a new sanitary sewer relief pipeline ranging in size from 21 inches to 30 inches.

The Project’s primary objective is providing future relief capacity to the existing 18-inch sanitary sewer in El Camino Real during wet weather events as well as capacity for accommodating planned upstream pipeline improvement projects to minimize the potential of sanitary sewer overflows.

The proposed sewer alignment would cross under El Camino Real and Caltrain tracks at 25th Avenue and tie into the future downstream sanitary sewer improvements at South Delaware Street.

Benefits of Work:  Reduce potential sanitary sewer overflows in the City

Expected Impact:  Short term traffic, street parking, and pedestrian impacts during construction

Project Status: 
  • The City's contractor, Platinum Pipeline, has implemented traffic controls to allow for construction of the project. Please use alternate commute routes.
  • Traffic control impacts public parking on 25th Avenue, from Flores to Delaware. Temporary public parking is provided at the corner of 25th Avenue and Delaware. Pathfinder signs are installed to direct the public to this newly paved lot.
  • Excavations are underway to install the sewer piping for the project. Please use caution near the construction area.
  • The project is on schedule to be completed by August 2014.          

Project Manager:  Tim Karlstrand, Project Manager
Phone: (650) 522-7300

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