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Queensland Laboratory (a division of the OCTIEF Consulting Group) was engaged by Seven Network Operations Limited to conduct monitoring of the air inside an asbestos work enclosure in order to determine an estimate of the concentration of asbestos fibres within the workers breathing zone. Air monitoring was conducted during a number of different simulated home renovation scenarios including cutting asbestos cement with a circular saw and sanding asbestos cement with an electric sander.
Following the monitoring process, the membrane filters were analysed using phase contrast microscopy in accordance with The National Guidance Note on the Membrane Filter Method for Estimating Airborne Asbestos Dust [NOHSC: 3003 (2005)].
The concentrations of asbestos fibres in the workers breathing zone during these two tasks were up to 32 times the national exposure standard of 0.1 fibres per ml.
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