Lincoln Park/Cotter Mill superfund cleanup: Cotter wants to reduce the frequency of groundwater monitoring

Lincoln Park/Cotter Mill Site via The Denver Post
Lincoln Park/Cotter Mill Site via The Denver Post

From The Pueblo Chieftain (Tracy Harmon):

Public comment is being sought on a Cotter Corp. uranium mill proposal seeking to reduce the frequency of groundwater monitoring on 11 new wells. The state health department has preliminarily approved the request and will take public input before making a final decision. Cotter Corp. Mill Manager John Hamrick indicated more than a year’s worth of sampling has been amassed on 11 new wells, which were dug in late 2011 to help establish the extent of groundwater contamination.

“Once we’ve established 12 months of measurements, we generally move to quarterly sampling as we do with all the other wells,” Hamrick explained.

The mill and a portion of the neighboring Lincoln Park community have been an EPA Superfund site since 1988 due to uranium and molybdenum contamination in groundwater and soils. Groundwater is not used by residents in the contaminated area of Lincoln Park as they all have been connected to the city water supply.

Hamrick said the average uranium value for each of the new monitoring wells is below the Colorado Groundwater Quality Standard. Only three wells have exceeded the standard for uranium — one six times, another twice and the third just once.

The average molybdenum concentration for most of the new wells also was below the state standard and only three wells have exceeded that standard out of 115 samples.

The state health department reviewed the request as did the Cotter Community Advisory Group. Regulators feel, “Significant baseline data” has been collected to allow for quarterly monitoring instead of monthly, said Jennifer Opila, unit leader for the state heath department’s radioactive materials division.

Public comment will be accepted Monday through Sept. 13. Comments can be sent to Warren Smith, community involvement manager, via email at or by calling 303-692-3373.

More Lincoln Park/Cotter Mill coverage here and here.

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