Between 2019 and 2021, TNJV, a Joint Venture formed by TREVIICOS and Nicholson, took part to the Boone Dam Internal Erosion Remediation Project.
Located upstream of Kingsport, TN (USA), is owned and managed by TVA, Tennessee Valley Authority (TVA). Built in 1953, the barrier has an 850-ft long concrete gravity dam section, and an 850-ft long earthen embankment dam. The resulting Boone Lake has a capacity of 75,800 acre-feet.
A sinkhole was discovered near the downstream toe of the dam in October 2014, and soon after TVA observed turbid discharge exiting from the riverbank downstream of the dam, indicating potential dam safety issues. In July 2015, TVA announced plans to construct the Boone Dam Internal Erosion Remediation Project, an erosion barrier through the dam and its foundation, consisting of works aimed to mitigate the risk of potential dam failure due to internal erosion and safely return the dam and reservoir to normal operations.