Both of these facilities are critical to the transmission of water in the northern portion of the Peninsula.

Description
The project includes a general mechanical and seismic upgrade of existing facilities and the addition of a pressure-reducing station. Miscellaneous work will also be performed at the Pulgas Pump Station and the Pulgas Tunnel Air Shaft in order to facilitate moving flow southward through the system at higher pressures than normal.

The major work elements at the various sites primarily include:

• The Baden Valve Lot improvements include installation of a new pressure-reducing valve to allow water to flow from the HTWTP high-pressure zone to the low-pressure supply zone, installation of five new isolation valves, replacement of three existing valves, seismic retrofit of eight existing vaults, replacement of onsite piping segments, replacement of the existing electrical switchgear and transformer, replacement of three pumps, installation of variable frequency drives, and other miscellaneous improvements.
• The San Pedro Valve Lot improvements include seismic retrofit of two valve vaults, modification of the electric valve operators, installation of a new air valve, and miscellaneous site drainage improvements.
• The Pulgas Pump Station improvements include replacement of one isolation valve, and the improvements at the Pulgas Tunnel Air Shaft include site work to stabilize slopes.

Scope Refinements
The work at the Pulgas Pump Station and Pulgas Tunnel Air Shaft have been added to the project to facilitate the transmission of water southward through the tunnel in the event of an emergency.

Need more information?
Contact Maureen Barry at (415) 554-3297 or via email at mbarry@sfwater.org