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Two oil field services firms have been fined a combined $14,800 for violations tied to the 2014 death of an oil field worker.

According to the Denver Post, Colorado-based DJ Basin Transport will pay a $5,000 fine and Texas-based Gibson Energy LLC will pay a $14,800 fine after the Occupational Safety and Health Administration cited both firms for failing to provide a safe working environment.

The citations were related to an incident of fatal exposure to toxic vapors that killed 57 year old John McNulty in 2014.

According to a forensic pathology report seen by the Denver Post, McNulty was working on catwalk between tanks at an oil site in Weld County, Colorado when he become unresponsive for “unknown reason.”

Federal health officials determined that McNulty likely died after he inhaled toxic vapors as he was measuring storage tanks.

OSHA cited both firms for failing to develop and use gauging and sampling procedures that did not expose employees to an oxygen deficient atmosphere or to hydrocarbon gases and vapors, the Denver Post added.

Neither firm has commented on the matter.