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Underground Flow Equalization System

UFES Project Update – January 27, 2023

Progress Continues on UFES Project

The UFES project continues to make great progress! As of January 20, 2023, over 9,000 cubic yards of concrete have been poured at the San Mateo County Event Center site, and the walls of the underground concrete structure are complete. A series of pours planned to start in February will create the ceiling of the structure. Preparations for the ceiling pours began earlier this month.

Construction continues on the nearby electrical building at the Event Center site and the diversion structure on South Delaware Street near the intersection with Saratoga Drive.

The ongoing pipeline work along South Delaware Street has begun to ramp down; several of the pits will be backfilled and the road restored in segments during the coming months.

Pipeline work along South Delaware Street and Saratoga Drive is expected to be complete in Spring 2023. The City anticipates that the UFES project in its entirety, including work at the San Mateo County Event Center, will conclude by the end of 2023.

Please watch for traffic signs, which are placed in specific areas to provide direction and ensure the safety of drivers.

Approved work hours are as follows:
San Mateo County Event Center Site: 7 a.m. – 7 p.m.
Saratoga Drive: 7 a.m. – 5 p.m.
South Delaware Street: 7 a.m. – 5 p.m.

*Construction schedules and traffic patterns are subject to change.

UFES construction photo 1-2023
Aerial view of UFES project (facing east) showing completed floor, vertical wall forms and walls, and several completed columns; December 12, 2022. Photo credit: Wilson Meany

Stay Connected with the UFES Project

The Clean Water Program’s UFES construction is well underway and we want to keep you informed. The team established multiple information channels for residents and business owners to stay connected.

  • Sign up for construction alerts (text the word UFES to 1-833-321-0231), email us at or call our hotline at 1-650-522-7250.
  • You can also visit our UFES project page to see project details and sign up for our e-newsletter. If you don’t want to opt in, but still want information, bookmark the link where we post our updates to the project website.