Harry Tracy WTP Long-Term Improvements Project

San Bruno, California

Harry Tracy Water Treatment Plant (HTWTP) treats and delivers water stored in the Crystal Springs and San Andreas reservoirs to residents and businesses in North County, and is the San Francisco Peninsula’s sole source of emergency water.

Upgrades included making HTWTP more seismically sound and improving treatment capacity and reliability. A new, 11-million-gallon treated water reservoir provides up to 140 million gallons per day (MGD) of emergency water in the event of an earthquake along the San Andreas Fault. HTWTP remained operational at all times, with six scheduled, major shutdowns for tying new processes into the existing system.

MEC managed the electrical subcontractor and supported electrical quality control. Major electrical work included:

• Relocating all electrical equipment in the West Chemical Building to allow for its demolition
• Moving plant operations into Phase 3 of the operations building
• Installing new conduit and cable to three new ozone generators and PSU’s
• Installing a 480-volt emergency power system in the ozone building area
• Electrical work associated with removing and replacing the ozone destruct units and ozone destruct blowers
• Startup and commissioning of the new 4160-volt standby power generator