Replacement contractor finishes sewer project Jun 2012
SAK Construction News Release
Work is completed on the retendered Lemay Wastewater Treatment Plant Wet Weather Expansion Outfall Sewer project in St Louis, USA.
SAK completed excavation

SAK completed excavation

Unexpected ground conditions put a halt to initial efforts to excavate a new 558ft (170m) x 16ft (4.88m) tunnel leading from the Lemay treatment plant to a structure on the west bank of the Mississippi.
Owner Metropolitan St Louis Sewer District (MSD) reissued the project, and in December 2010, tunneling contractor SAK Construction was awarded the pipe installation and tunneling contract to complete the job.
Scope included completion of 381ft of linear tunnel excavation. A TBM completed excavation to a diameter of 11ft; crews then used non-explosive and explosive rock methods to further widen the tunnel to 16ft diameter to accommodate the installation of concrete pipe segments of 12ft x 132in diameter.
In addition to challenging ground conditions, the SAK team had to contend with the discovery of a previously unknown and unmarked sanitary tunnel that caused flooding during tunnel excavation and required a temporary bypass pumping operation. The completed outfall sewer line is now in service, following completion earlier this month (June 2012).
The project was designed by Black & Veatch with construction management provided by KAI Design & Build.

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