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The Metropolitan Pier and Exposition Authority (MPEA) decided to pursue a “green” approach to storm water management. Architect AECOM devised a 4,000-foot-long; 12-foot-diameter storm water conveyance system that carries clean water at a runoff of 497 cubic feet per second from the convention center’s 61.8 acre roof to Lake Michigan, diverting as much as 55 million gallons of storm water from the City’s combined sewer system each year. As part of this process, Mc4West also constructed a seven-foot-diameter, 200-foot-deep drop shaft and a 20-foot-diameter, 235-foot-deep outlet shaft. Mc4West utilized a Tunnel Boring Machine during excavation, as well as drill and blast techniques.