Harry Tracy WTP Long-Term Improvements Project

Harry Tracy WTP Long-Term Improvements Project

San Bruno, California

MEC completed work on the Harry Tracy Water Treatment Plant (HTWTP) Long-term Improvements Project  for the San Francisco Public Utilities Commission (SFPUC). The 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 to the facility helped improve the nearly-100-year-old Hetch Hetchy Regional Water System, making HTWTP more seismically sound, improving treatment capacity and reliability, as well as other improvements, including additional filters and upgrades to various systems. The new, eleven-million-gallon treated water reservoir provides up to 140 million gallons per day of emergency water in the event of an earthquake along the San Andreas Fault.

HTWTP had to remain operational at all times during construction, with the exception of six scheduled, major shutdowns for tying new processes into the existing system. MEC managed the electrical subcontractor and assisted in fulfilling the project’s Electrical Quality Control requirements.

Major electrical work during the shutdowns 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 3 new ozone generators and PSU’s
  • Installing the 480V emergency power system in the ozone building area
  • Electrical work associated with removing and replacing the Ozone Destruct Units and Ozone Destruct Blowers
  • Start-up and commissioning of the new 4160v standby power generator