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Wastewater

Project

A 2.6-mile deep rock CSO storage tunnel with six shafts, cutting overflow events by design.

Sector Wastewater Completed 2020

Deep rock storage tunnelling in a dense, heavily contaminated industrial setting.

The tunnel provides in-line storage to capture combined sewer overflows during storm events, treating up to 106 million gallons per day of peak flow.

Scope of work

  • Tunnels & Underground Engineering
  • Geotechnical Engineering
  • Construction Management
Hoffman Tunnels provided tunnel and underground design, engineering and construction-phase support.

Project facts

Length
2.6 miles
Shafts
6
Storage
CSO capture
Completion
2020
Related work

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