Lincoln Park/Cotter Mill superfund site update: Change in state molybdenum standards slated for February 2013


From the Cañon City Daily Record (Rachel Alexander):

In February 2013, the size and shape of the molybdenum plume in Lincoln Park ground water will shrink because of changes in state standards.
Previously, the Colorado Water Quality Control Commission had set the standard at 35 micrograms of molybdenum per liter of water. Effective Feb. 1, 2013, that will change to 210 micrograms per liter of water. The federal Nuclear Regulatory Commission’s enforcement level is 100 micrograms per liter of water.

In addition to Colorado Standard, the Cotter Mill, which is the original source of the Lincoln Park plume, also must comply with NRC standard. The levels must be at least as restrictive as the state standards. Because the NRC level is now more restrictive than the state standards the Hazardous Materials and Waste Management Division of the Colorado Department of Public Health and the Environment will require Cotter to meet the 100 micrograms per liter of water level.

From The Pueblo Chieftain (Tracy Harmon):

A new cleanup standard for molybdenum levels in groundwater has drastically reduced the size of a cleanup area contaminated by the Cotter Corp. Uranium Mill.

The mill and a portion of the neighboring Lincoln Park community became a part of a federal Environmental Protection Agency Superfund cleanup site in 1984 after molybdenum and uranium contamination seeped from unlined tailings ponds into the groundwater.

As of Feb. 1, the state Water Quality Control Commission standard for cleanup of molybdenum in water will be 210 micrograms per liter, up from the previous standard of 35 micrograms per liter, according to a fact sheet issued by state health officials Tuesday.

Despite the change, Cotter will be required to clean up groundwater at any reading above 100 micrograms per liter because that standard is required by the Nuclear Regulatory Commission. A map included with the fact sheet shows two small plumes targeted for cleanup.

“This means that 16 wells previously included in the more conservative standard are now outside the plume boundary. Only six wells are inside the Lincoln Park plume,” according to the fact sheet.
“I object to this change in the moly standard for groundwater as I believe from studies I’ve read that it will have an adverse impact on health (of people) through bones, gout and arthritis when drinking well water at this level,” said Sharyn Cunningham, co­chair of Colorado Citizens Against Toxic Waste. “This will allow Cotter to avoid protective cleanup.”

The fact sheet indicates the most common negative health effect from consuming too much molybdenum for a long period of time is gout.

Wells that are located within the contamination area are not being used for human consumption. Instead residents have been hooked up to the city water supply.

“Groundwater contaminate levels in most areas have been decreasing even though there is no active groundwater cleanup action in place in the area,” according to the fact sheet.

More nuclear coverage here and here.

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