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D Basin (Central Basin) Sewer Rehabilitation

Project Type: 

Sewer Inspection and Cleaning

Project Schedule/Status:

Initial design work is expected to be completed in Spring 2024, followed by detailed design work.

Project Location:

D Basin covers San Mateo area south of state route (SR) 92 and southwest of Highway 101, with a smaller portion extending to the north side of SR 92. Basin D serves as the collection system for public and commercial centers, such as the Peninsula Golf and Country Club and the San Mateo County Event Center, as well as several residential neighborhoods such as Hayward Park, Sunnybrae, Bay Meadows, Beresford Manor, San Mateo Village and Lauriedale (see map).

Project Description:

San Mateo’s stormwater and wastewater collection system includes a network of 240 miles of pipeline divided into five major sewer basins. The City’s Public Works Department (PWD) performs thorough condition assessments of the sewer system, tracks the condition of the system, and performs routine maintenance of the pipes.

A condition assessment is the first step toward finding cost-effective and technically feasible fixes to minimize inflow and infiltration.

Video inspections were conducted between Spring 2023 and December 2023 using a remote-controlled camera, to help the City check the condition of the pipes, obtain information that will enable the City to identify problem areas, and plan for future rehabilitation and repair, such as spot repairs, lateral repairs, pipe lining, segment repairs, manhole repairs, etc.

The D Basin Sewer Rehabilitation project included cleaning and video inspection of:

  • Approximately 121,400 linear feet of pipe in the public right-of-way
  • Approximately 84,000 linear feet in easements on private property,
  • Approximately 700 manholes in the public right-of-way and 300 manholes in easements on private property

Repairs and replacements are needed to maintain the proper operation of the system, to meet regulatory requirements, and to prevent sewer overflows.

Map of full length pipe replacement locations.

Engineer Firm Name and Key Project Contact: 

Engineering Consultant Project Manager: Freyer & Laureta, Josh Kimbrell, 415-534-7070,
City/CWP Project Manager: Laura Webb, 650-522-7322,