Oak Ridge Today

TVA completes retaining wall, the largest of its kind, at Kingston ash spill

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Kingston Ash Spill Retaining Wall

KINGSTON—The Tennessee Valley Authority has achieved a significant milestone in its cleanup of the ash spill at the Kingston Fossil Plant—the completion of an earthquake-resistant, underground retaining wall around the containment cell at the recovery site.

The wall, which completely surrounds the 240-acre containment cell where recovered ash will be permanently stored, was completed on Feb. 20, almost a month ahead of schedule.

“I’m extremely proud of the project team for accomplishing this major undertaking,” said Bob Deacy, TVA senior vice president of projects. “They kept safety at the forefront and completed this significant milestone ahead of schedule.”

Construction of the wall began in summer 2011. Two high-capacity, long-reach hydraulic excavators dug trenches that were 4 feet wide and reached depths between 40 and 70 feet. More than 200,000 tons of cement and other materials were used to construct the wall, which is embedded 70 feet into the bedrock.

It is the largest wall of its kind in the U.S. at nearly 64,000 linear feet, the equivalent of 12 miles, and is designed to withstand a magnitude 6.0 earthquake. [Read more…]

TVA finishes excavating spilled coal ash at Kingston plant, starts covering disposal area

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Kingston Fossil Plant Ash Spill Cleanup

Ash that spilled into the brown embayment pictured above has been removed, and workers are placing a black liner over an ash containment cell, pictured at center, preparing to close it late next year. More than 5.4 million cubic yards of coal ash spilled in December 2008 when a storage cell used by the Kingston Fossil Plant, back left, failed.

KINGSTON—It was the largest ash spill in U.S. history. A dike failed on a storage cell on a cold December night more than four years ago, and roughly 5.4 million cubic yards of coal ash surged out, covering about 300 acres of land and water near the Kingston Fossil Plant.

No one was injured, but 40 homes in the area were affected. The ash filled three embayments north of the coal-fired plant, covered Swan Pond Road, and flowed into the Emory River. Three homes became uninhabitable because of structural damage.

The work to clean up the gray sludge, which had been four to six feet deep, has been under way since the Dec. 22, 2008, spill. On Friday, officials paused to celebrate two milestones in the six-year, $1.2 billion project. [Read more…]

TVA, EPA update Roane County on ash cleanup efforts

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Information from WYSH Radio

On Thursday, officials from the U.S. Environmental Protection Agency and Tennessee Valley Authority updated Roane County residents on the ongoing cleanup efforts from the 2008 coal ash spill at the Kingston Fossil Plant.

The December 2008 spill dumped more than a billion gallons of coal ash sludge into the Clinch and Emory Rivers and into the surrounding community. What had been 5.4 million cubic yards of sludge is now down to about 70,000 cubic yards—or 14 million gallons—and officials expect to have the rest cleared by the end of June. [Read more…]