Further testing for a range of contaminants at three locations where soil was delivered from the Herons Creek to Stills Road Pacific Highway upgrade are continuing.
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Workers on site were sent for medical tests after experiencing headaches and nausea earlier this month.
All were cleared and are back at work.
An exclusion zone was set up around the area where workers were affected and will remain closed while investigations continue.
Testing to date has indicated the soil is negative for radioactive material, pesticide, hydrocarbon, biphenyl or other metals above health investigation levels.
During excavation, excess top soil from the site was given to some nearby properties upon their request.
Roads and Maritime Services (RMS) will have this soil tested as a precautionary measure in the interests of safety.
RMS has been in contact with the affected property owners and has discussed the processes and next steps involved.
Arrangements have been made with property owners to establish exclusion zones around the soil until test results become available.
An RMS spokesperson said in addition to the main site being cleared of serious contaminants, the top soil from the upgrade which is what was provided to the three sites sits about five metres above the clay level where material which made workers feel ill was recently discovered reducing the risk of contamination further.
“Results from the investigation have been progressively coming in since testing began on 4 April 2012 and more investigations and testing are continuing.
“RMS and independent specialists are working hard to get the results finalised for the upgrade and external sites as soon as possible,” the spokesperson said.
