The I-94 Modernisation Segment 3 Package 1 Drainage Tunnel will provide a resilient drainage solution as part of the I-94 freeway modernisation from Burns Avenue to Barrett Avenue. The 1.75km-long soft ground drainage tunnel will have a 4.4m inner diameter and an estimated 15-24m overburden. The design-build project also includes a launch shaft, retrieval shaft, two offline drop shafts, junction chamber, pump station, adit connections, and other associated work.
The subsurface conditions anticipate the use of a pressurised face TBM.
The local utility provider, DTE Energy, supplies three-phase 480V, 4.8kV, and 13.2kV services to customers in the Metro Detroit Area. MDOT wants to determine the power required for a three-phase 13.2kV primary service to provide sufficient electrical capacity to support surface works and TBM operations at the tunnel launch/mining site and proposed onsite step-down transformer capacities and configurations, including typical redundancy and protection schemes used for TBM power distribution.
Through the RFI, the MDOT wants to gather information to help it understand the power needs from industry to help support tunnel operations and to confirm and/or refine the utility co-ordination approach for the project.
The deadline for responses is August 29, 2025.
