PITTSBURGH (KDKA) – Pennsylvania Department of Environmental Protection officials are looking into a “light sheen” spotted on the Monongahela River Sunday.

Officials say the sheen, about a mile in length, was spotted near Dravosburg.

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“It’s a sizable sheen that stretches from shoreline to shoreline and approximately one mile down the river,” Allegheny County Department of Emergency Services Chief Alvin Henderson said.

The DEP said the material is likely petroleum and estimated the sheen spotted on the river was created by roughly 36 gallons worth.

It’s unclear where it came from.

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“Currently, we have the county’s Hazardous Materials Response Team along with our Swift Water Response Team actually doing recon in the river trying to determine if they could see where the oil sheen is starting from,” Henderson said.

The DEP says that the Monongahela River is a source of water for Pennsylvania-American Water Company, but does not believe that drinking water supplies have been affected.

The DEP also says there was likely no impact to fish or other wildlife.

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