Linh Ta

lta@dmreg.com

An investigation is ongoing on how a pipeline leaked 138,600 gallons of diesel fuel in Worth County early Wednesday morning, according to Magellan Midstream Partners L.P., the pipeline company.

The 3,300 barrels of diesel leaked out of Magellan's 12-inch pipeline system near Hanlontown around 390th Street and Wheelerwood Road, said Bruce Heine, spokesman for Magellan. A portion of Wheelerwood Road will be closed for two days, according to the Worth County Sheriff's Office.

UPDATE: Cleanup underway; cause still unknown

"It’s a big one — it’s significant," said Jeff Vansteenburg, a field office supervisor for the Iowa Department of Natural Resources. "The responsible party is Magellan, so they’ll have to bear the cost of clean up."

The pipeline leaked on private agricultural land, said Karen Grimes, spokeswoman for the Iowa DNR. There is a small stream near the leak, but Grimes said no surface water has been contaminated. The Iowa DNR has not uncovered any underground water contamination.

The leak occurred when the pipeline ruptured and diesel sprayed out, Grimes said. Magellan reported the leak around 8 a.m. It was initially reported that 63,000 gallons leaked out, Grimes said.

"They found that it’s basically pooled into a farm field that’s near the break and has not reached the water in the state," Grimes said. "There’s a little creek, but it has not reached any surface waters at this time."

Heine said it's unknown what caused the leak at this time. Vansteenburg said nothing struck the pipe that would cause it to leak. He said there are sensors in the pipeline that notify Magellan when a problem occurs.

Since the leak, the pipeline has been contained, Heine said. No evacuations or injuries have been reported and there is no public health risk, according to the Worth County Sheriff's Office. Officials from the Environmental Protection Agency and the Iowa Department of Natural Resources responded to the scene.

Gas stations typically have a diesel-fuel tank underground that can hold between 10,000 to 15,000 gallons, Vansteenburg said. He said enough diesel spilled in Worth County to supply around 10 stations.

"The product is under pressure, so as soon as a leak develops, it starts coming out pretty fast," Vansteenburg said.

The last significant pipeline leak that occurred in the state was in 2001 when a pipeline owned by the Koch Pipeline Co. leaked 312,000 pounds of fertilizer near Algona, Vansteenburg said. 1.3 million fish, turtles, frogs and other aquatic life were killed from the incident, according to Register archives.

Magellan has been responsive to the leak, Vansteenburg said. He said the company brought vacuum and frack trucks to handle the diesel, which will be brought to the company's terminal in Clear Lake. Once all of the free-liquid diesel is recovered, he said the company will remove the contaminated soil.

Vansteenburg said the Iowa DNR will also see if any Iowa Administrative Codes were violated.

​Magellan’s pipeline system transports refined petroleum products from refineries in the Gulf Coast and midcontinent to petroleum distribution terminals throughout the Midwest, Heine said.

On Oct. 20, a Magellan pipeline holding anyhdrous ammonia leaked near Decatur, Neb., according to an article by the Omaha World-Herald. The paper reports that one person was killed due to the leak, while 40 other people were evacuated.