The DRSTS includes a10.5-mile main tunnel, 8.5
miles of relief sewer, and a 75 million gallon per day pump
station. The DRSTS permits delivery of communityflows
to the Wyandotte WWTP during wet weather events, eliminating
sanitary sewer overflows under design storm conditions and
reducing basement flooding.
Several innovative techniques new to the Midwest and project
of this size were used during the construction phase of the
main tunnel to reduce risk and control costs, including:
- A baseline geotechnical report that contractually
- established specific geotechnical considerations for
construction bidding
- Contingency bid items and allowances
- Escrow bid documents
- Dispute Resolution Board
- Pre-bid and pre-award meetings
Innovative contracting techniques further reduced the final
construction cost from $116 to 93.5 million. The techniques
also allowed the team to improve design as the project
progressed.
The NTH-Wade Trim Team won the Honorable Conceptor
engineering award from ACEC Michigan and MSPE for our
involvement in this project.
DOWNRIVER
TUNNEL_award.pdf
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