ST. CHARLES, Mo. (KMOV) -- Authorities were investigating after a worker was found at the bottom of a sewer pit in St. Charles on Tuesday.
Police said the victim, 50, was found at the Boschertown Sanitary Life Staion near the intersection of northbound Highway 94 and Joyce Drive.
Authorities said the man, who worked for KCI Construction Company, went into the sewer around 11:15 p.m. to work in the wet well, but never came back.
Officials said his co-workers went in about an hour and a half later and found the victim unconscious and nonresponsive about 30 feet down into the pipe.
Officials said the cause of the man’s death was unknown, but emergency responders said a monitor showed signs of “hazardous air environment.” That could mean there were low oxygen levels or some type of hazardous fumes.
Dan Casey with the St. Charles Fire Chief said the Occupational Safety and Health Administration was investigating the incident and looking into whether or not the sewer system where he was working was properly ventilated.
Casey said working there were no hazardous materials where he was working.
St. Charles Mayor Sally Faith expressed her condolences Tuesday evening.
“On behalf of the entire city, we are saddened to hear this news. Words are not enough to express the grief we feel at this moment,” Faith said.
The victim’s identity had not been released as of Tuesday evening.