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The Coast Guard said on Sunday that miles-long patch of discolored goop floating in the Gulf of Mexico appears to be caused by river sediment.
The Coast Guard collected and tested samples of a dark substance after receiving varying reports on Saturday of possible pollution floating on and beneath the water's surface.
The largest sighting described the substance as stretching 100 miles into the Gulf, south of Grand Isle, Louisiana.
An analysis found only trace amounts of petroleum hydrocarbons, oil and grease — all at levels well within the Louisiana Department of Environmental Quality's