Summit Reservoir

Summit Reservoir Seismic Retrofit

San Francisco, California

The project involved the seismic retrofit and other improvements to the two basins at Summit Reservoir.  Mitchell worked on only one basin at a time, allowing one basin to be in service at all times. Work begun with the installation of a temporary barrier to seal all openings above the existing dividing wall between the two basins. This prevented debris from the construction site from contaminating the adjacent basin. The barrier also functioned as shoring for the in-service concrete roof above.

Major components of this project included:

  • Selective demolition and abatement of hazardous materials.
  • Construction of drilled piers, pier caps, perimeter and shear walls, and foundations.
  • Concrete repair work, including spalling and corroded reinforcement fixes.
  • Installation of a Fiber Reinforced Polymer Composite System for roof diaphragm strengthening.
  • Various improvements to the valve house structure.
  • New reservoir entrance structures, inlet valve vault, and outlet screens.
  • Civil work such as installing a 16-inch ductile iron inlet pipe, crossover piping, and catch basins.
  • Mechanical and electrical work, including valve replacements and security system installation.
  • Concrete repair work, including spalling and corroded reinforcement fixes.
  • Installation of a Fiber Reinforced Polymer Composite System for roof diaphragm strengthening.
  • Various improvements to the valve house structure.
  • New reservoir entrance structures, inlet valve vault, and outlet screens.
  • Civil work such as installing a 16-inch ductile iron inlet pipe, crossover piping, and catch basins.
  • Mechanical and electrical work, including valve replacements and security system installation.