Rock cracked Cotter pipeline; contaminants contained at mill site — The Pueblo Chieftain

Lincoln Park/Cotter Mill superfund site via the Environmental Protection Agency
Lincoln Park/Cotter Mill superfund site via the Environmental Protection Agency

From The Pueblo Chieftain (Tracy Harmon):

Cotter Corp. Uranium mill officials say a leak that dumped about 7,200 gallons of contaminated water on the mill property was caused by a rock that punctured a hole in a feeder line.

The feeder line connects to the main pumpback pipeline above a Soil Conservation Service dam that helps prevent rainwater runoff from leaving the mill site. The pipeline carries contaminated water that seeps past the earthen dam and returns it to an impoundment.

“When Cotter personnel excavated the area of the leak, a large rock was discovered above the feeder line. The rock had punctured the pipe, causing the leak,” said Stephen Cohen, Cotter Mill manager.

“Because the puncture and associated crack were small, only a relatively minor percentage of the total actually leaked. Most of the flow continued into the pumpback pipeline,” he explained.

Cotter maintains a pressure monitoring system on the pumpback pipeline that deactivates pumps in the event of a sudden, large pressure drop. However, the feeder is isolated from the main pressure monitoring system, Cohen said. The leak could have occurred on Saturday and continued for 48 hours until workers discovered it on Monday.

It is believed that none of the contaminated water seeped off the mill site, according to Warren Smith, a state health department spokesman.

Cotter officials are replacing the broken section of pipe and the feeder line should be reactivated today, Cohen said. The main pumpback system continues to operate, Smith said.

Because leaks formed in the main pipeline on two separate occasions late last year, Cotter and state health officials are working to finalize a proposal to build a new pipeline.

“Cotter’s original plan does not include replacing any feeder lines. Because this line has broken, however, company (officials) plan to replace this entire section of feeder line when they replace the main pipeline,” Smith said.

Federal and state health officials also are working with Cotter representatives to come up with a plan to clean up and decommission the now-defunct uranium mill site.

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