File this one under the infrastructure portion of this thread.
Budget increase of $44.475 million at NEWPCC headworks project due to a shitty situation. Pun intended.
http://clkapps.winnipeg.ca/DMIS/perm...240205(RM)WW-4
From the report. NWI is the northwest interceptor, which is the large sewer conveying sewage into the plant.
On June 7, 2023, following a heavy rain event, an exposed portion of the NWI failed
catastrophically in one of the new chambers. At this time, one of the tunnels was complete
(connecting both chambers) and the second was in progress. The tunnel boring machine (TBM),
a specialized piece of equipment that excavates tunnels, was contained within the second
tunnel. High flows in the NWI flooded both chambers, the completed tunnel, and the tunnel in
progress. It also submerged the TBM and all related equipment. An insurance claim has been
initiated for this event and a portion of the related costs may be reimbursed.
The NWI failure has resulted in Contract changes for:
• NWI clean-up;
• NWI repair;
• TBM recovery;
• project delay; and
• protection of the Main Street Interceptor (MSI).
The NWI clean-up includes removal of sewage and settled solids from the chambers, tunnels,
and TBM that were flooded in the initial NWI failure, and in the subsequent floods until the NWI
was repaired. The NWI repair includes design, procurement of materials, and construction
efforts to repair the failed NWI.
The TBM recovery includes repair of the TBM and its components to allow the resumption of
tunnelling operations. The project delay includes costs to extend the project schedule. The MSI
is an 88-year-old pipe that was to be exposed similar to the NWI. Additional inspection, design,
and construction effort is required to minimize the risk of the MSI failing in a similar fashion to
the NWI.