May 2015, Vol. 70, No.5
Newsline
St. Louis MSD Completes Boring First Tunnel; Five More Tunnels To Go To Bid
Metropolitan St. Louis Sewer District (MSD) manages the fourth largest sewer collection system in the United States.
It has begun an ambitious program called Project Clear that will span a generation. This program is a multi-billion dollar investment addressing wastewater overflows by building community rainscaping, system improvements and a program of maintenance and repair throughout the system serving St. Louis region. The system improvements will include construction of nine tunnels to control sewer overflows. Construction of the first project is nearing completion, while plans for the remaining eight tunnels are underway.
MSD Project Clear reached a milestone in 2014 with the completion of the first phase of the 3,200 foot long by eight-foot diameter tunnel as part of the Lemay Redundant Force Main project. The Tunnel Boring Machine (TBM) Miss Chelsea completed the digging of the tunnel between February and May 2014. The agency is expecting to finish the $20 million project later this year, when surface connections are completed. In constructing this second force main, the Lemay Wastewater Treatment Plant will be able to accept a higher volume of wastewater, and allow MSD to inspect the original force main for the first time since its construction in the 1960s.
“Construction on the eight remaining tunnels is planned to begin over the next dozen years,” said MSD Executive Director Brian Hoelscher. “These tunnels represent significant work opportunities for the construction industry with the second tunnel expected to go to bid as early as 2016, followed by four more tunnels beginning construction in 2017.These next five tunnels have an estimated construction cost of over $1 billion.”
As part of the overall program, construction may also include new sewer lines to convey wastewater, above-ground storage tanks to store stormwater, or deep underground tunnels to both store and convey additional flow during heavy rain events until capacity is available at the respective treatment plant.
“We want the construction industry to be aware of these upcoming opportunities and plan accordingly,” Hoelscher stated. All prospective bidders must be prequalified and certified prior to advertisement of these projects. Prequalification is based on past project experience, performance and financial strength. For questions regarding the prequalification process for these projects, contact Marie Collins P.E., assistant director of engineering, at (314) 768-6316 or Allen Muehlher P.E., program manager, at (314) 768-6239.
The following table outlines the key components of each of the remaining eight tunnels. The schedule and cost presented is tentative as determined by current planning efforts, and subject to program implementation and final budget approval.
For more details about MSD Project Clear tunnel projects, visit http://www.projectclearstl.org.
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