The Los Angeles County Fire Department responded to a hazardous material incident at the Pitchess Detention Center in Castaic that sent an employee to the hospital with burns Monday morning, officials said.

Firefighters received the call around 9:45 a.m. in the 29300 block of The Old Road, where the North County Correctional Facility is located on the Pitchess Detention Center property.

“When units arrived on scene they reported 20 gallons of alkaline have spilled,” said Gustavo Medina, an inspector for the Los Angeles County Fire Department.

Related: Pitchess Detention Center Gets Money For Renovations Alongside L.A. County Jail Construction

Firefighters later downgraded that assessment to 2.5 gallons of alkaline spilled, according to the department’s Twitter account. Alkaline is a broad term that covers any basic substance dissolved in water.

The patient was transported to a local hospital with burns on 5 percent of his body, Fire officials said in a tweet.

Fire officials told KHTS that the injured man was an employee at the facility, not an inmate.

The incident is still under investigation, according to officials.

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