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Mr Forbes said work on the pipe installation, beginning this week, would take about two months to complete.
The pipes would be lifted into place by a Downer excavator operator.
The cycleway project was progressing well and remained on track for completion before the end of 2022, he said.
Within the next two weeks, the team also planned to realign the Roseneath water supply pipeline, place the Roseneath wall precast panels and back-fill them and make a start on the reclamation of the northern end of Blanket Bay, which requires the temporary closure of District Rd.