Clean Water Program LogoCity of San Mateo LogoCity of Foster City LogoCity of San Mateo Public Works Logo


E Basin (South Basin) Sewer Rehabilitation

Project Type: 

Collection System

Project Schedule/Status:

Construction began in Fall 2023 and is estimated to be completed in Summer 2024.

Project Location:

E Basin covers the southern portion of San Mateo, west of El Camino Real. This includes the Beresford/Hillsdale, Westwood Knolls, Laurelwood, and Sugarloaf neighborhoods (see map).

Residents and businesses will continue to be notified prior to the start of construction work. The contractor will provide additional notices two to three days prior to work starting in your area.

Project Description:

The purpose of the E Basin Sewer Rehabilitation Project is to repair and rehabilitate existing sanitary sewer pipeline and manholes.

This project is part of the City of San Mateo’s rehabilitation of the overall wastewater collection system. Cracked sewer pipes and laterals allow outside rainwater and groundwater to flow into the sewer system. Faulty manhole covers also allow outside water into the system. Improvements are needed to ensure proper operation, repair leaks to meet regulatory requirements, and prevent high flows that can result in sewer overflows.

Prior to construction, the City conducted a condition assessment and closed-Circuit Television (CCTV) studies to identify problem areas in the collection system and to design spot repairs.

This project focuses on two types of work:

  • Gravity Sewer System – Spot and Segment repairs
  • Manholes – Repairs and replacements

Map of E Basin

Gravity Sewer Spot Repairs and Replacement

Gravity mains offer reliable movement of sewage and surface runoff through a sewer system. However, over time the ground can shift, roots can penetrate, and traffic can impact sewers causing them to settle and crack. During this project, our contractors will repair damaged or displaced 6-, 8-, and 10-inch-diameter sanitary sewer mains with the same size pipe at 343 locations throughout E Basin.

Manhole Repair and Replacement

Manholes need to be easily accessible for sewer maintenance and related emergencies. Over time, manholes can become covered with grass or can sink below the grade level of lawns, roads, or sidewalks. During this project, our contractors will repair 212 manholes with lining, repairing channels and benches, and fully removing and replacing select manholes. There are several methods of rehabilitating manholes, and the method selected for a job depends on the condition of the manhole. Common rehabilitation methods used for projects such as this include:

  1. Replacing the frame and cover
  2. Applying cement mortar as a binding agent to the inside

Engineer Firm Name and Key Project Contact: 

Engineer Consultant: Schaaf & Wheeler, Ben Shick, 707-528-4848,
Contractor: D’Arcy & Harty Construction, Niall Fogarty, 415-846-0441,
Construction Management: Townsend Management, Tolio Ybarra, 415-254-2208,
City/CWP Project Manager: Laura Webb, 650-522-7322,