Aug. 1, 2022, GRAHAM COUNTY, ARIZONA – The Graham County Sheriff’s Office is investigating an early Sunday morning rollover of a semi-truck reportedly hauling sulfuric acid to Freeport McMoRan’s Safford Operations mine.
According to Graham County Dispatch notes, the rollover occurred in the area of Norton Road and Reay Lane. The Sheriff’s Office was contacted about the crash at about 3:33 a.m.
Semi-trucks often loaded with sulphuric acid frequently utilize Norton Road – which has a residential neighborhood – as a bit of a shortcut from their trip from the Miami, Arizona area east to the Safford site. Truckers advise the turn onto Norton Road from Highway 70 is an easier one to make, however, there is a traffic light at the intersection of Highway 70 and Reay Lane and not one at the Norton Road intersection.
According to the Centers for Disease Control and Prevention, sulfuric acid is a clear, colorless, oily liquid that is very corrosive. If you are exposed to concentrated sulfuric acid in the air, your nose will be irritated and it may seem like sulfuric acid has a pungent odor. When concentrated sulfuric acid is mixed with water, the solution gets very hot. Concentrated sulfuric acid can catch fire or explode when it comes into contact with many chemicals including acetone, alcohols, and some finely divided metals. When heated it emits highly toxic fumes, which include sulfur trioxide.
The crash is still under investigation by the Sheriff’s Office, but preliminary notes from County Dispatch advised that no sulfuric acid leaked. However, diesel fuel from the truck is believed to have leaked onto a cotton farm where the truck landed. The Thatcher Fire Department also responded to the scene.
The road was closed for a time period as a heavy wrecker and crane uprighted the truck and towed it from the area. The roadway was then cleared by 10:06 a.m.