First Large Diameter Hard Rock CSO Chamber in St. Louis

摘要

The Maline Creek Tunnel (MCT) will be the first large diameter chamber to store combined sewer overflows in St. Louis. The MCT is a key feature of Project Clear, Metropolitan St. Louis Sewer District's (MSD) Long Term Control Plan to address sanitary and combined sewer overflows to local streams and rivers. Project Clear's estimated cost is greater than $4 Billion dollars making it the largest public works project to date for the state of Missouri. The MCT includes the construction of a 40-ft diameter, 12.5 MGD submersible pump station, a 28-ft diameter x 2,700-ft long cavern, a 580-ft long x 6-ft lined connecting tunnel, three deaeration chambers, three intake structures, a shallow connector sewer constructed by microtunneling, and 1,000 feet of 12-inch to 30-inch diameter near surface sewers. Bids were opened on March 10, 2016. The successful bidder was SAK/Goodwin JV with a bid of $82.3 M dollars. The Engineer's Estimate was $87.7 M dollars. The project was awarded in May 2016. The contractor mobilized on site in June 2016. The project is allocated 1567 calendar days to complete the construction.