AFFHOLDER (formerly known as SAK Construction, LLC tunneling) will use the TBM named Miss Briella for the Lower Meramec Tunnel Phase 2 project, part of the Metropolitan St. Louis Sewer District.   

The machine will be lowered into the starter shaft and assembled over the next several weeks before tunnelling the 10.94 km (6.8-mile) long and  approximately 61 m (200 feet) wide tunnel - in South St. Louis County, through shale and limestone at depths of 78 ft to 286 ft (24 m to 87 m).  

When completed in 2025, the  EUR 156,77 million (USD175 million) tunnel will prevent wastewater overflows and improve water quality throughout the sewer district across the St. Louis area. It will take water to the Lower Meramec Treatment Plant near the confluence of the Meramec and Mississippi rivers. Visit https://msdprojectclear.org/ and https://www.robbinstbm.com/. 13/23.