Asbestos 'used as fill
"The National Parks and Wildlife Service (NPWS) closed Neilson Park's Shark Beach in the city's east known for its "sublime views and several spacious picnic areas" in early 2022, after its 100-year-old seawall was damaged in a 2016 storm."

"There was the need to remove 3,600 tonnes of asbestos contaminated building material and soil which had been used as fill under the old seawall."

https://www.abc.net.au/news/2023-10-17/sydney-nielsen-park-shark-beach-closed-ongoing-seawall-repair/102979078
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