City Fire Chief Mark Ashworth said the person overcome by fumes, who was identified as a worker, was taken to a hospital suffering from injuries that were not life threatening.
Ashworth said the worker opened the rear doors of a trailer and was overcome by the vapors.
The chemical was not identified.
The chief praised officials at Veolia, which transports chemical waster, for their response and cooperation.
A explosion in 2009 at the Veolia Environmental Services plant in West Carrollton left four employees injured and caused $50 million in damage.
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