The Northeast Ohio Regional Sewer District faced an overflow of roughly 4 billion gallons of untreated water into Lake Erie every year. This project included the excavation and construction of a cavern-style pump station connected to a 3-mile-long single-pass precast concrete-lined storage tunnel that significantly reduces raw water overflow and improves the environmental status of the region. The project consisted of two 40-foot-diameter 242-foot-deep shafts, a cavern pump station located 240 feet below ground, a 12,615-square-foot pump building at grade level and associated building and site work.