(KRON) — A big rig driver lost control at a sharp turn and went off the road in Sunol on Wednesday, according to the Alameda County Fire Department (ACFD). The big rig trailer was overturned on Calaveras and Geary roads in the census-designated place in Alameda County.

ACFD first received a call around 12:49 p.m. about the overturned big rig. It was reported the truck was leaking fluid, which was later determined to be aluminum sulfate. It was headed to the Sunol Water Treatment Plant.

The big rig is approximately 100 yards from the closest lake. officials said. However, the leaking fluid was deemed not a threat, according to hazmat officials.

Crews will be on scene to remove the fluids and the truck from the area. That will take “five to six hours at least,” according to an email sent by ACFD at 4:22 p.m. on Wednesday.

On Thursday at 9:31 a.m., however, CHP said crews are still working to remove the big rig and corrosive liquid.

The driver refused to be taken to the hospital, officials said. Photos of the overturned vehicle were posted by ACFD (below).

Calaveras Road at Geary in Sunol is located in Alameda County, roughly 15 miles east of Fremont.