Basin 1b Pipe Capacity Improvements

Map of project location.Project Type: 

Collection System

Approximate Construction Start & End Dates:

May 2019 to May 2020

Project Location:

The work is being delivered in one package comprising two areas, as follows:

Area One:

  • Edinburgh Street from Fordham Drive to Sonora Drive
  • Sonora Drive from Edinburgh Street to Maple Street
  • Maple Street from Sonora Drive to Hobart Avenue
  • Hobart Avenue from Maple Street to Palm Avenue
  • Palm Avenue from 12th Avenue to 16th Avenue
  • 16th Avenue from Palm Avenue to 80 feet northeast of South B Street
  • Barneson Avenue, 20 feet southwest of El Camino Real

Area Two:

  • 5th Avenue from El Camino Real to 90 feet northeast of S Railroad Avenue
  • 9th Avenue from El Camino Real to Palm Avenue
  • San Mateo Drive from East 4th Avenue to East 5th Avenue
  • Alley between East 4th Avenue and East 5th Avenue from El Camino Real to San Mateo Drive

Project Description:

As part of the Clean Water Program, the Department of Public Works is upgrading the existing aging and undersized sewer network. This work will increase the integrity of the sewer system, reduce sewer overflows during storms, and help the City meet regulatory requirements. These project areas were selected using hydraulic modeling to help determine the most efficient, cost effective solutions.

Basin 1b, located in the central portion of San Mateo, consists of project work in two different areas. Most of the work is the alignment from Edinburgh Street to 16th Avenue, as shown on the map below. Orange marks where existing sewers will be replaced (2,935 feet), while green and yellow show new relief sewer lines (3,260 feet). A short, 10-foot span of new pipe under Barneson Avenue is also planned.

The rest of the project comprises rehabilitation and replacement work in downtown San Mateo on San Mateo Avenue, the alley between East 4th and East 5th Avenues (between San Mateo Drive and El Camino Real), and 9th Avenue between El Camino Real and Palm Avenue. The total length of repaired, rehabilitated, and upsized pipe is 9,340 feet.

Work is within the City’s, California Department of Transportation’s, and Caltrain’s rights-of-way. Some lane closures and traffic control will be required for pipeline work within City streets. The project will also be coordinated with the Fire Department, Police Department, Recology (a local integrated resource recovery company), and local utilities, such as PG&E and Comcast.

Engineer Firm Name and Key Project Contact:

Jacobs Engineering Group Inc., Sarah Pham, Project Engineer, 650.727.6884 or