Shell Bridge Sanitary Sewer Force Main Rehabilitation (CIP 455-710)

The existing 16-inch force main along Shell Blvd Bridge was originally constructed in the 1960’s and is a critical facility which delivers over 500,000 gallons of sewage (approximately one-third of the wastewater generated in the City) daily to the San Mateo Wastewater Treatment Plant. During a routine maintenance inspection, a small crack was identified on the top side of the force main which called for a repair. The repairs were completed in February 2021 and included the in-house replacement of the air release valve located on the force main at the high point on the bridge. The repair was only a temporary fix, and a permanent solution is being reviewed.  This project will rehabilitate or replace the existing force main.