The Concrete Council of St. Louis presented a Quality Concrete Award to the project team completing the Lemay Wastewater Treatment Plant Wet Weather Expansion for the Metropolitan St. Louis Sewer District. 

Tarlton served as general contractor for the $95 million expansion to increase the district's peak wet weather capacity and enhance plant operations. Tarlton's award-winning Concrete Group coordinated the pouring of nearly 20,000 cubic yards of concrete and placed more than 10,000 linear feet of concrete pipe at the site. The team used seven different concrete mix designs on the complex multiple structural applications.

Improvements completed as part of the multi-year project included two grit basins with channel grinders, a primary sludge pump station and a grit handling building and four primary clarifiers. Major components included a 75-foot-deep excavation and a 558-foot-long tunnel, plus the installation of 12-foot-diameter storm and sewer piping and numerous large cast-in-place underground vaults/junction chambers.

The project also encompassed a historic engineering feat: the design, construction and installation of a temporary concrete diversion structure around a portion of MSD's 96-inch influent pipe -- believed to be only the second 96-inch diversion completed in the United States.

"We are all very proud that our efforts and focus on quality were recognized by a Quality Concrete Award on a project as complex as the Lemay Wastewater Treatment Plant Wet Weather Expansion," said Steve Cronin, vice president - Concrete Group. 

Black & Veatch was project architect and engineer, with KAI Design & Build serving as construction manager.