Jackson County

Chevron: Air monitoring shows chemicals below detectable levels

JOHN FITZHUGH/SUN HERALD/2013 
 A storage lid failed at Chevron's Pascagoula refinery on Tuesday, Sept. 29, 2015
JOHN FITZHUGH/SUN HERALD/2013 A storage lid failed at Chevron's Pascagoula refinery on Tuesday, Sept. 29, 2015

PASCAGOULA - The Chevron Refinery Tuesday released a timeline of events and results of air monitoring data related to the Sept. 28 collapse of a storage tank roof.

The refinery, in a press release, said air monitoring was conducted in the community from Sept. 28 through Oct. 4, and all readings were below detectable levels.

Chevron posted several documents for public view on the city's website related to the summary of events and the air monitoring.

One of the documents stated the tank released about 49,000 barrels of a pentane-hexane hydrocarbon mixture. Both pentane and hexane, known as mercaptans, are chemicals commonly found in gasoline.

"Air analytical samples that were collected from the community and sent to a laboratory for analysis also showed no chemical concentrations at levels associated with adverse health effects," Chevron said. "The mercaptans have an unpleasant odor and based on the information we have to date, we are not aware of any adverse health effects associate with this incident, aside from short-term discomfort, such as nausea and headaches."

Read the summary of events, community fact sheet and air monitoring reports.

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