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…]