LABOR'S plan to build a port in Victoria's west carries grave environmental risks through rock demolition and large-scale dredging, the coalition government says.
But shadow treasurer Tim Pallas denies Labor's proposed port in Bay West, near Geelong, will result in blasting at Port Lonsdale to accommodate larger ships.
"Explosives have not been used in Port Phillip Bay since the '70s," Mr Pallas said on Thursday.
He said the freight and logistics industry had signalled it was unlikely that anything above 10,000 TEU (twenty-foot equivalent unit) would ever come to Australia and therefore dredged depths would not be required.
Ports Minister David Hodgett said Labor's Bay West option would affect the environment by demolishing rock at the Heads.
"For Labor to develop a Bay West-Point Wilson port option, they would have to blast the Heads," he said.
"Good luck to Labor's environment minister that wants to blow up Point Wilson or Point Lonsdale."
A document by the Department of Transport estimates that dredging at Bay West could cause further sea level rises in the bay of at least 2cm and potentially affect the Marine National Park at the Heads.
It also estimates that a site near Point Wilson would require between 66 and 84 million cubic metres of dredged material to be removed, three to four times the recent channel deepening project volume.
Both sides of politics have pledged to sell the Port of Melbourne, but Labor wants a second container port at Bay West while the coalition favours one at Hastings.
The transport department has estimated the cost of developing Bay West at $12.4 billion, and $9 billion for Hastings.
Mr Pallas said the estimates for the dredging material required for Hastings had not been released, but his advice was that the figures for Bay West and Hastings were broadly similar.
Mr Hodgett said Hastings was a natural deep-water port - at least 16 metres deep - and that any dredging required there would be "bare minimal".
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