CAMPBELL — A man is dead after a possible caustic chemical exposure at a Wilson Avenue industrial waste disposal facility.

A police report and a statement by a local company confirm that Shawn Bennear, 61, of Edinburg, Pa., died Friday. While the Mahoning County Coroner’s Office has not yet released a cause of death, the police report and a statement from Belmont Solids Control LLC, an affiliate of Bass Environmental, suggest that toxic chemicals may have been responsible.

Campbell police reported they were called to Belmont Solids, 2415 Wilson Ave., for a possible overdose. When they arrived, they found a manager attempting CPR on an unconscious Bennear, who was foaming at the mouth.

The police report states that there was a noticeable odor of chemicals and rotten eggs.

Police immediately administered two doses of naloxone (Narcan) to counter a possible opioid overdose, but the drug had no effect. Campbell Fire and EMS arrived and took over lifesaving efforts.

At the same time, police and fire personnel were notified that another person had passed out, possibly from fumes, and was sitting behind the building. That man received treatment from Campbell EMS while Bennear was transported to St. Elizabeth Youngstown Hospital, where he was pronounced dead, the Campbell police report states.

The Campbell Fire Department attempted to test the air, only to find their sensor was damaged. When another air sensor was retrieved, it registered 5 ppm of hydrogen sulfide gas. An online search suggests that the safe level for the gas — which causes a rotten egg odor — is less than 0.03 ppm.

Campbell firefighters called in the Mahoning County HazMat team and evacuated the buildings.

When police spoke with the surviving man at the hospital, he told them that he was behind Bennear’s truck, managing the pumping of cut sulfuric acid into the tanker.

The report states he told police that when Bennear stopped responding to him, he went to the truck’s cab to check on him and found Bennear unconscious on the ground. The man told police he quickly lost his breath too and began to lose consciousness.

He said he started to run toward an open door in the building and only remembers being awoken by other company employees.

The man told police that when he went to the cab to check on Bennear and the gauges, he smelled an odor he had never smelled before. He told police it was possible that some glycol could have been mixed with the cut sulfuric acid.

An online search shows that when glycol and sulfuric acid — even cut acid — mix, the result is an exothermic reaction that usually releases several different types of toxic gases, including 1,4-dioxane, a “highly volatile compound.” Another compound produced by the reaction, sulfur dioxide, is known to cause severe respiratory trauma.

The report states that medical professionals told police Bennear had several chemical burns around his face and hands.

A news release from Belmont Solids Control states that the company operates an industrial waste processing facility that reclaims water from waste streams, with the intention of keeping wastewater out of injection wells and landfills.

“As with any operation of this kind, sulfur-based compounds normally produce rotten egg type odors on site,” the release states. “The Campbell Fire Department tested the air at the scene and confirmed that hydrogen sulfide levels measured approximately half of the exposure limit established by OSHA. No other employees in the immediate area — including the employee who performed CPR on Mr. Bennear in the same location — experienced any adverse health effects.”

The police report does not indicate what the other man’s medical condition may be as a result of exposure to the fumes, except that he was awake and able to speak with police at the hospital.

Bennear’s Facebook profile states that he works as a dump-truck driver for Top Shelf Trucking of Wilmington, Pa. Belmont Solids Control’s news release states that company is one of its subcontractors.

“We want to acknowledge the tragic loss of Shawn Bennear. While the circumstances surrounding his death are still being investigated, our first thoughts are with his family, friends and coworkers who are grieving,” the statement reads. “We’re reaching out to Mr. Bennear’s family to offer our support during this difficult time. We’re also cooperating fully with investigators and will share confirmed information with the public as it becomes available.”

The company also said OSHA is investigating the incident.