On February 15, Ft. Wayne (Indiana) City Utilities publicly opened bids for the estimated $250M Three Rivers Protection and Overflow Reduction Tunnel (3RPORT) and Shafts Package, in the USA. Five pre-qualified joint ventures entered bids for the project, they are:
- S.A. Healy/Salini Impreglio – $187,963,000
- Shea/Jay Dee – $205,998,194
- Strabag/Walsh – $224,983,000
- Traylor/McNally – $225,694,734
- Kiewit/SELI – $229,889,934
The bids will be taken under advisement with the City required to choose the lowest bid that meets the project’s specifications. The contract will be awarded within the coming weeks.
Cutting Edge 2018, Atlanta, GA
The 3RPORT deep rock Tunnel and Shafts Package includes the construction of the 3RPORT tunnel, including shafts, adits and appurtenances. The work includes 24,500ft of CSO tunnel, with a minimum finished diameter of 16ft; seven drop shafts; one drop structure within the Retrieval Shaft; four vent shafts; six adits with a finished diameter of 7ft; one diversion structure and consolidation sewer; Working Shaft with a minimum excavated diameter of 68ft through the overburden and 64ft through rock; and Retrieval Shaft with a minimum finished diameter of 25ft through the overburden and 21ft through rock.
The tunnel will be constructed by TBM at an average depth of approximately 200ft through dolomitic limestone. Construction on the project could begin in late May or early June. The tunnel is expected to be completed by 2021.
The tunnel is part of Fort Wayne’s agreement with the federal government to reduce the amount of combined sewer overflow (CSO) that is currently being discharged into rivers during wet weather.
The tunnel will begin south of Foster Park on the east side of the St. Marys River. It will run parallel to the St. Marys River, cross Swinney Park, go through downtown then run parallel to the Maumee River until it reaches the existing sewage treatment plant, which is located on the Maumee River east of North Anthony Boulevard.