Grade Separation Update: Pile Driving to Pick Back Up on Monday

Pile driving is scheduled to resume on Monday, July 23. Pile driving will be limited to weekday daytime hours from 9 a.m. to 3 p.m. The work will involve excavation, drilling and machines that hammer or drive columns into the ground. A total of 100 piles will be driven into the ground over the course of three weeks. At times, noise levels could be as high as 75 decibels, and we apologize for any inconvenience this may cause.

This weekend, there will be a temporary road closure in San Bruno so cranes may place steel bridge structures above the vehicular underpass. This work will begin at 9 p.m. Friday, July 20, and go until

6 a.m. Saturday, July 21, and will occur again from 9 p.m. Saturday until 6 a.m. Sunday, July 22. During this time, San Mateo Avenue will be closed between Huntington and 1^st avenues. Detour signs will be posted in the area to help with traffic flow. We apologize for any inconvenience this may cause. 

Other work, which includes digging with a backhoe and mini-excavator, will be done in the daytime from 7 a.m. to  4 p.m. Crews will excavate, remove temporary shoring, install utility infrastructure, install rebar, and pour concrete. Crews will use medium and heavy duty diesel vehicles to transport dirt and concrete. 

Night work will occur from Saturday, July 21, through Friday, July 27, between 11 p.m. and 7 a.m. Crews will excavate, install steel girders, remove shoring, weld steel structures, and pour concrete.  

The $147 million project will elevate the Caltrain tracks above three existing at-grade street crossings at San Bruno, San Mateo and Angus Avenues.  A new elevated Caltrain station between San Bruno and San Mateo Avenues will replace the station at Sylvan Avenue. 

For more information, please call the dedicated outreach line at 650-508-7726 or email sbgradesep@caltrain.com.

—Caltrain