Alcoa has successfully demolished the old Anglesea power station in Victoria despite concerns about asbestos in the building.

Former Anglesea workers have told reporters that gaskets and flanges which contained asbestos were still inside the building before it came down.

“My concern is the flanges being torn apart during the explosive collapse, creating friable fibres,” a former worker has told the ABC.

Alcoa successfully brought the building down company after its first attempt in May failed.

Before the demolitions, the company said it undertook a year-long asbestos removal program regulated by WorkSafe.

Victoria’s Environment Protection Authority (EPA) ordered Alcoa to release air monitoring results from seven sites surrounding the station after the first attempt.

Alcoa says air monitoring did not detect asbestos fibres above health and safety exposure standards after the first demolition attempt.

“The safety of all site personnel and the community is Alcoa's priority,” the company said.

“We remain very confident that [the] demolition and subsequent clean-up activities do not pose a risk to employees, contractors, the community or the environment.”

Executive director of assessments at the EPA, Tim Eaton, said there had been meticulous planning in the lead-up to the demolition.

“We're not just relying on what we see, we can actually validate that through technical instrumentation,” he said.

“What you should see is no change to those levels when the dust cloud passes over, so we expect to see that.

“When the previous explosion took place, we saw exactly that. There was no elevation.”