Second Sydney primary school among four more sites testing positive for asbestos contamination

Single piece of bonded asbestos found in a garden bed at Allambie Heights public school

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• Map and full list of locations where asbestos mulch has been found

A second primary school in Sydney's north is among four additional sites that have returned positive results for asbestos contamination.

The NSW Environment Protection Authority on Saturday confirmed Allambie Heights public school in northern Sydney, two residential estates under construction in Sydney's south-west and Munn Park in Millers Point tested positive for traces of asbestos-laden mulch.

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