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Abstract: The 3RPORT tunnel is part of the Long-Term Control Plan (LTCP) of the City of Fort Wayne (Indiana, USA) having the main goal to reduce the discharge of untreated Combined Sewer Overflows (CSOs) and improve water quality in Fort Wayne’s CSOimpacted streams. The tunnel will have a length of about 7.5 km, an internal diameter of 4.87 m, and is excavated by means of a slurry TBM. The tunnel is...