Summary
It remains unclear what caused a large cloud of chemical gas to be released at the Leetsdale Industrial Park Thursday morning, leaving one man with minor injuries and 500 workers evacuated for several hours.
About 8:30 a.m., a worker at Weatherford International's Engineered Chemistry division was transferring ammonium persulfate - - a dry, crystalline chemical used in the oil and gas industry to thin out liquids -- from 5-gallon pails into a large mixer when a violent reaction started in one or more of the pails, said Allegheny County Chief of Emergency Services Robert Full.See the full content of this document
Extract
Chemical Reaction Causes 500 People to Evacuate Leetsdale Industrial Park
More than 300 emergency responders including hazmat crews from Allegheny and Beaver counties were dispatched ...
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