The asbestos on the Mt Stromlo bike path has been there for over 40 years. It is associated with the ruins of what is locally known as the Magnetic Hut (not to be confused with The Magnetic Hut on ANU Campus).
Back in 1973 it was situated in a pine forest. You could see many hand sized pieces of bonded sheet asbestos scattered around two concrete piers and steps.
The 2003 fire removed all the trees and shrubs around this place and it should have been seen by the trail builders who situated the trail 4 meters from the piers.
Mountain bikes have been grinding the asbestos pieces and breathing the dust for 10 years before someone noticed!
Attached find a photo I took on April 5th. The white paint at the base of the piers shows the place of flaking bonded sheet asbestos which the workmen removed earlier.
If you scratch the ground around the piers you can still find asbestos pieces. But it is out of sight.