South Magnolia CSO Tank


Construction of a buried combined sewer overflow (CSO) reservoir.

  • Excavation to 25 feet below sea level on the shore of Puget Sound.
  • Included a monolithic concrete pour of 5,000 CY.
  • Contaminated soils removal.
  • SJC designed a shoring system that allowed for a 35 foot deep excavation, 120 feet wide by 300 feet long with no cross bracing.