Upper East Fork Poplar Creek is pictured above at the Y-12 National Security Complex in Oak Ridge on Friday, May 22, 2020. (Photo by John Huotari/Oak Ridge Today)

More than 4,000 fish and crayfish were killed by chlorinated water and mercury at the Y-12 National Security Complex in two series of incidents in 2018 and 2021. 

The first series of incidents was likely caused by the release of mercury while crews were cleaning up and removing equipment at the Alpha-4 Building on the west side of Y-12, according to scientists and officials. Alpha-4 is the most contaminated of the four major mercury-contaminated buildings at Y-12. Millions of pounds of mercury were used at Y-12 decades ago to produce nuclear weapons parts. Removing mercury-contaminated buildings, equipment, and soil remains one of the top challenges of cleaning up the Oak Ridge Reservation.

Upper East Fork Poplar Creek is pictured above at the Y-12 National Security Complex in Oak Ridge on Friday, May 22, 2020. (Photo by John Huotari/Oak Ridge Today)

 

More than 4,000 fish and crayfish were killed by chlorinated water and mercury at the Y-12 National Security Complex in two series of incidents in 2018 and 2021.

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Water line rupture at Y-12 kills small fish, salamanders

East Fork Poplar Creek

East Fork Poplar Creek starts at a spring at the Y-12 National Security Complex and flows through Oak Ridge. It has been listed on a state list of impaired waterways due to mercury and polychlorinated biphenyls, among other things.

About six million gallons of chlorinated water spilled into East Fork Poplar Creek from a ruptured drinking water line at the Y-12 National Security Complex, and an estimated 8,500 minnow-sized fish and almost 30 salamanders were killed in the area of the incoming chlorinated water, a media advisory said. It said the rupture in the potable water line was found Saturday. The numbers of dead fish and salamanders were determined by workers from the Oak Ridge National Laboratory Biological Monitoring and Abatement Program. [Read more…]