Project getting underway by Traylor Bros/Jay Dee comprises 1.95 km drive in dolomitic limestone by 7.5 m-diameter TBM. Will be segmentally lined at 6.7 m internal diameter. Access shaft 92 m-deep with 9.5 m internal diameter, 800 mm-thick concrete lining cast in place. Two 2.54 m-diameter blind drilled access shafts to 84 m depth and six 3.2 m-diameter diffuser shafts drilled to 70 m depth in river bed. Sept 1999.  Wirth reports its PBA 928 blind shaft borer with reverse circulation working with Traylor Bros/Jay Dee/Millgard jv has completed the two land shafts and is now engaged on drilling the six shafts in the Detroit river which will provide riser pipes for the outfall tunnel. A 22 year-old Robbins open gripper TBM is under conversion by CTS, Kent, WA to a shielded 7 m-diameter machine with segment erector for the 1.9 km-long drive in soft limestone. Visit www.americancommercial.com and www.wirth-drilling.com June 2000.