WORKERS dressed in anti-asbestos gear spent last week digging at Ropes Crossing.
Asbestos Diseases Foundation of Australia president Barry Robson, a Blackett resident, contacted the Star after driving past the workers near the Forrester Road entrance.
He believed the land was being prepared to be built on.
"I know anti-asbestos gear when I see it," Mr Robson said.
"I've never seen them there before. It vindicates what people have been saying for years. Potential buyers should be made aware and not consider moving there until they can be given a 100 per cent guarantee that there's no more asbestos there."
It was revealed the site, now a housing estate managed by Lend Lease, was contaminated with toxic waste and asbestos in 2003.
An independent site auditor issued the Ropes Crossing precinct with a site audit statement declaring the site suitable for residential land uses before the start of any development, a Lend Lease spokesman said.
"As a condition of the site audit statement we assess each stage prior to completing bulk earthworks," he said.
"Health and safety is our No. 1 priority and consistent with WorkCover requirements all contractors working in the area are required to wear appropriate clothing as a precaution."
Shalvey environmentalist Brent Robertson has renewed calls in recent years for records showing the former ADI site had toxic waste and asbestos cleared before it was developed.
"I'm still not convinced stuff isn't still buried there, including asbestos," he said yesterday.
"I wouldn't risk moving there. Independent auditors have got it wrong before. They're not gods. The site should have been left undisturbed as a park."