Transport for NSW confirms more Sydney sites contaminated with asbestos mulch

Traces of asbestos have been found in mulch at more Sydney sites, a top New South Wales government official confirmed to 2GB's Ben Fordham this morning.

The revelation comes amid a government investigation into asbestos contamination in Rozelle Parklands in the city's Inner West.

Josh Murray, secretary of Transport for NSW, spoke with Ben Fordham on 2GB after a listener reported more potentially contaminated sites.

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"We've been continuing to test and retest so we can be very clear with the public about this contamination and we have identified some sites overnight," he said.

The contaminated mulch was discovered at electrical substations in Dulwich Hill in the Inner West and Canterbury and Campsie in south-west Sydney by contractors.

There is no public access to the affected sites.

Asbestos contamination was also found in landscaping work at the Prospect Highway in western Sydney, between Prospect and Blacktown.

Murray said officials were still working through details and would be forwarding lab samples from the sites to the Environment Protection Agency.

"Clearly there is a problem in the supply chain we need to address," he said.

News about further contaminated sites comes after work began yesterday to clean up Rozelle Parklands in Sydney's Inner West after asbestos was found there earlier this month.

Contractor John Holland CPB Joint Venture is removing garden beds before being taken from the site.

Over coming weeks, it will work through the park to ensure full compliance with the EPA's February 29 deadline to remove affected material at the parklands site.