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
- 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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