UPDATE: The prime-mover and first trailer have been removed from the scene of a chemical spill about 35km south of Millmerran on the Gore Hwy.

Millmerran police officer Senior Constable Hans van Kempen said herbicide had spilled on the road and into a table drain after the second trailer of the B Double combination rolled onto its side about 1.30pm yesterday.

He said a nearby resident had this morning voiced contamination concerns over the spill.

Emergency crews as well as Department of Environmental Heritage Protection staff and Toowoomba Regional

Council workers have spent the day managing a clean up.

The truck was carrying chemicals 2, 4-D and glysophate from Melbourne to Toowoomba when the incident occurred.

About 10,000 litres of herbicide spilled after this truck crashed on the Gore Hwy south of Toowoomba.
About 10,000 litres of herbicide spilled after this truck crashed on the Gore Hwy south of Toowoomba. Stuart Cumming

Queensland Fire and Emergency Service Dalby officer Acting Inspector Peter Bradow said the table drain was dammed last night to stop the chemicals from spreading into the watercourse or neighbouring dams.

"This has been successful and contained the product," Act. Insp. Bradow said.

"We will now have the operators of this trailer clean up the waste and have it removed."

He said an accurate measurement of how much chemical had been spilled was today being ascertained.

"Estimates are around 9000 to 10,000 litres."

Tests are being done to establish how much contaminated soil will need to be taken from the site.

"At this stage, estimates are about 300mm of earth to be removed."

Authorities inspect the chemical spill.
Authorities inspect the chemical spill. Stuart Cumming

The highway is expected to be reduced to one lane at the site for the rest of today.

The 59-year-old driver of the truck, from Highfields, was uninjured.

EARLIER: Emergency services have returned to the Gore Hwy south of Toowoomba this morning where a truck crash has caused a major chemical spill.

A truck carrying a dangerous herbicide crashed near Captains Mountain about 4pm.

About 9000 litres of the poisonous chemical spilled on to the highway.

A sand bund has been put in place to contain the chemical.

The highway is currently open to one lane, but will close completely later this morning to allow authorities to continue the clean-up.

The driver of the truck was not injured.

The scene of the truck crash on the Gore Hwy south of Toowoomba that caused a major chemical spill.
The scene of the truck crash on the Gore Hwy south of Toowoomba that caused a major chemical spill.

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