In 2004, the Tennessee Valley Authority (TVA) commissioned a new regional seismic hazard analysis. This study developed probabilistic-based, uniform seismic hazard spectra for TVA dam sites, including Blue Ridge Dam. The intake tower and embankment dam at Blue Ridge were evaluated, and it was concluded that remedial measures were required for the intake tower and both the upstream and downstream slopes of the embankment to ensure stability during and after the design seismic event. In addition, the penstock required remediation to address a number of deficiencies. Garney was selected by TVA to stabilize the dam and install new penstock liner. This project includes the installation of 1,000 LF of 147″ diameter steel pipe liner inside 14′ diameter existing penstock, grouting of the annular space, installation of intake tower anchors, electrical duct bank relocation, the placement of 426,000 tons of filter material, rock and rip rap on the upstream and downstream embankments, and an extensive dewatering system. Significant challenges of this project are a compressed construction schedule, working within extremely limited space with large diameter penstock, and coordinating deliveries of all materials.
“Garney made sure the project was successful, while simultaneously adapting to the constant changes. Garney began the process of implementing TVA’s safety culture early in the project, resulting in continuous improvement of the safety culture at Blue Ridge Dam. There were over 250,000 man hours worked on this difficult, potentially dangerous construction project, and not one lost time incident.”
Jeff Brown, Tennessee Valley Authority