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The three were performing preventative maintenance on the plant's Ultraformer-3, which converts naphtha produced in oil refining to reformate, an octane booster for gasoline.

Reformate is colorless, flammable and toxic to touch, inhale or ingest.

Each barge was carrying an estimated 25,000 barrels of reformate, and the Coast Guard said in a statement that an unknown volume of the gasoline product spilled.

The Coast Guard says each barge was carrying an estimated 25,000 barrels of reformate and that an unknown volume of the gasoline product spilled.

Port Houston spokeswoman Lisa Ashley says reformate is colorless, flammable and toxic to aquatic life.