A major chemical plant and two hazardous waste sites stood in the path of floodwaters streaming over two breached dams in central Michigan, authorities said Wednesday.

About 10,000 residents along the Tittabawassee River in Midland County, Michigan, began evacuating Tuesday night as flood waters reached “containment ponds” at Dow Chemical Co. by Wednesday morning.

Flood waters were expected to reach their highest points by late Wednesday night, but the river crested three hours earlier than predicted and under the forecast levels.

Dow officials said they’ve implemented their “flood preparedness plan” and are working in coordination with Midland County authorities and the U.S. Coast Guard.

“All operating units on site have been safely shut down, except for facilities needed for safely managing chemical containment, and all railcars are secured,” according to a company statement.

“Only essential staff are onsite to monitor and manage the situation with no reported employee injuries.”

Dow said Wednesday evening that flood waters commingled with an on-site pond used for storm water and groundwater remediation. The was no reported product release and no threat to residents.

The EPA said it’s closely monitoring two nearby Superfund sites, the Tittabawassee River itself and the Midland Soil Contamination sites. Superfund sites are environmentally contaminated areas that have been targeted by the EPA for cleanup.

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