The right lane of the southbound Red Hill Expressway near Barton Street was closed through the evening commute.
Hamilton police Sergeant Terri-Lynn Collings said the truck rolled over at around 12:30 p.m. The truck is sitting on its side in shallow water.
An estimated 10 litres of diesel were leaked, but the spillage was contained by a nearby stormwater pond, according to John Beals, MOE district supervisor. The discharge valve in the pond has been closed to prevent the contaminant from spreading.
Quantum Murray, a company that specializes in hazardous materials cleanups, was on site in the afternoon preparing to clean up the spill. John Scales, a response technician, said they had an oil boom set up around the truck that will pick up any diesel that spills into the shallow water surrounding it.
Scales estimated the cleanup would take between 30 and 45 minutes, following a successful extraction of the truck from the ditch.
MOE spokesperson Jennifer Hall said environmental officers were on site in the afternoon, and would stay throughout the truck extraction and cleanup.
“A small amount of diesel fuel has leaked from the fuel tanks… It’s small, but not insignificant,” said Hall.