Basin 4 – Dale/Norton Relief Sewer Project
Approximate Construction Start and End Dates:
June 2022 to March 2023
The project is in the design phase and construction contract award is anticipated to occur in 2022.
- Anna Street between north of Dale Avenue and Dale Avenue
- Dale Avenue between Anna Street and South Norfolk Street
- South Norfolk Street between Dale Avenue and Kehoe Avenue
- Hemlock Avenue between South Norfolk Street and Patricia Avenue
- Patricia Avenue between Hemlock Avenue and at the Dale Avenue Pumping Station
The purpose of the San Mateo’s Basin 4 Dale Norton Relief Sewer Project is to improve the ability of the overall wastewater collection system to manage heavy seasonal rainfall. These improvements will help prevent sewer overflows, as well as help the City comply with regulatory requirements. During heavy rains, the wastewater collection system capacity is overwhelmed by the amount of rainwater that enters the system through infiltration and inflow. This causes sewer overflows at locations around San Mateo, such as manholes and at the wastewater treatment plant. These overflows contaminate city streets, creeks, lagoons, beaches, and San Francisco Bay.
The work associated with this project includes installation of approximately 2,290 feet of new sewer pipes. The project is evaluating various trenchless construction methods, such as micro tunneling and jack and bore, to reduce potential impacts on the public. The upgrades will add capacity to the system, helping to reduce sewer overflows.
The new pipelines will be installed in City streets, including some in high-traffic areas. The new pipe will connect to the existing sewer system in several locations, including the influent pipeline to the Dale Avenue Pump Station. Pipe locations are shown on the maps below.
Mitigation measures will be in place to minimize the effects of the project on residents, businesses, commuters, and others. Notifications will be sent ahead of construction to alert property owners and occupants prior to the start of construction.