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News » US » JV picked for massive cut-off wall at Tennessee dam » published 23 Aug 2018

JV picked for massive cut-off wall at Tennessee dam

The Treviicos-Nicholson Joint Venture has been named as foundation contractor for a massive cut-off wall as part of the project to stem seepage at the Boone Dam in Tennessee.

The JV will build the underground cut-off wall for the Tennessee Valley Authority (TVA). The wall will be the final major underground piece of the seepage remediation project before the reservoir refill phase begins. It is part of a composite seepage barrier being built to stop internal erosion of the dam’s earthen embankment. The overall project, which involves an estimated investment of US$450m, is expected to be completed in 2022.

After seepage was discovered below the earthen embankment in October 2014, an investigation discovered an internal erosion issue that could eventually lead to the failure of the dam. Plans to repair the dam were presented to the public at a July 2015 meeting. Since that time the dam has been widened, hundreds of holes drilled and grouted, more than 200 monitoring instruments installed and 220,000t of rock placed on both sides of the dam to add stability to the earthen embankment. Workers are currently building a new laydown yard and employee parking lot in preparation for this next phase of construction.

 “This project is about protecting the businesses, families and communities downstream and we look forward to working with Treviicos-Nicholson to maintain the safety of the downstream public and our workers while producing a quality repair,” said Sam Vinson, TVA principal project manager.

Nicholson has been working at the dam periodically since 2015.

 

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This article was published on 23 Aug 2018 (last updated on 23 Aug 2018).

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