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Vol. XVIII • No. 25
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Progress Continues On $250M Columbus LOT Project Clint Wilson/Black & Veatch photo
Gowdy shaft construction
Clint Wilson/Black & Veatch photo
The microtunneling boring machine (MTBM) is lowered into the Gowdy shaft for Columbus, Ohio’s Lower Olentangy project.
By Cindy Riley CEG CORRESPONDENT
Currently more than two-thirds complete, Columbus, Ohio’s Lower Olentangy Tunnel project (LOT) is designed to minimize the amount of sewage that overflows into the Olentangy River during flooding. The $250 million undertaking includes a main tunnel of approximately 17,000 ft. of 12-ft. diameter tunnel, at an average depth of 50 ft. This portion is mined with a tunnel boring machine (TBM) and constructed of precast concrete segments. “Delivering a project of this size requires continuous, close coordination between all parties to effectively complete the work and navigate any issues that may arise,” said Jeremy Cawley, project manager of the city of Columbus Division of Sewage and Drainage (DOSD). “We are very fortunate to have, and greatly appreciate, the high level of sharing, cooperation and commitment provided by all the firms involved.”
The city of Columbus is under two Ohio Environmental Protection Agency consent orders to improve water quality and reduce the potential for human contact with waterborne pollutants by reducing combined sewer overflows and sanitary sewer overflows into creeks and rivers during wet weather events. Granite Construction serves as the prime contractor on the project, while Black & Veatch is responsible for construction management and inspection services, overseeing and monitoring all aspects of the work. In addition, Delve Underground is a sub-consultant to DLZ, which is the prime design consultant responsible for the overall design delivery. Delve’s duties included assistance with the design of the tunnel and shafts on the project. According to Cawley, construction is going well. “Granite completed the mining of the southern portion of the main tunnel from Gowdy Field to Vine Street, which is approximately 5,000 linear feet, and is continuing with the construction of all associated shafts. They are mining the northern reach of the main tunnel and have completed 5,500
linear feet to date. They also are working on the deep rock connector tunnel to the existing OARS tunnel and have finished the mining of the 1,100 linear feet, 90-inch micro-tunnel to the 2nd Avenue site, as well as the jet grouted safe havens along the alignment.” The Gowdy shaft, which is the TBM launch location, was constructed via slurry wall panels and has a figure-eight shape. see LOT page 8