THE DER remains tight-lipped about dust samples collected from Beeliar in September.
The Department received two complaints from Beeliar residents about dust on cars on September 5, prompting an investigation.
One of those came from Paul Lange, who believed Cockburn Cement was to blame for films of dust continually building up on his car and home, 1.5km from the facility.
“It’s like I’ve been to the North Pole and the ice hasn’t melted,” he said at the time.
Mr Lange said he was told testing by Cockburn Cement had found just 7 per cent of the dust on his property could be attributed to them, with the surrounding environment blamed for the rest.
He was not able to look over the results himself.
A spokeswoman for Cockburn Cement said its plant is near other industries, market gardens, unsealed areas and new residential developments, meaning there could be any number of reasons for the spike.
At the time a DER spokesman said the samples would be analysed to find the source or sources of the powdery substance, with the results expected within a couple of weeks.
The Department was giving little away last week.
“The results from the dust samples taken by DER were analysed, showing they primarily consisted of calcium,” a spokeswoman said.
“As the matter remains under investigation, no further details can be provided at this time.”Beeliar resident Paul Lange