Challenges:
- Corrosion of corrugated steel tunnel liner from acidic soil
- Loss of structural integrity would cause safety concerns, production stoppage, and costly unscheduled repair.
ICE Impact:
- Recommended a repair plan which prevented a costly failure.
- excavated the tunnel from above and specified concrete encapsulation of the whole structure after local repair of the steel.
- Have since included the tunnel and conveyor into inspection and maintenance planning
