Washington County Service Authority Water Intake
South Holston Reservoir, Washington County, Virginia
On December 1, 2006, TVA issued a final environmental assessment and finding of no significant impact (FONSI) for the Washington County Service Authority’s (WCSA) proposed new water intake. The new water intake requires TVA Section 26a approval. TVA issued this approval on December 12, 2006.
The WCSA proposal involves the construction and operation of 12 million gallon per day raw water intake and pump station at South Fork Holston River Mile 72.5 (right bank), about 150 feet upstream of the confluence of the Middle Fork Holston River, in southwest Virginia. The purpose of the proposed intake is to provide increased withdrawal capacity for the Washington County Water Treatment Plant in order to meet future municipal water supply demands. TVA’s environmental assessment focuses on potential impacts to water quality and quantity, aquatic ecology, and historic properties.
Since 2006, WCSA has submitted two requests to TVA for approval of modifications to the original design of the raw water intake structure. In the first request, WCSA proposed to install a single water intake structure below the low water level instead of the above-ground, wet well type structure. On August 3, 2010, TVA issued a revised FONSI for the modifications. In the second request, WCSA proposed to install three water intake structures below the low water level and construct a valve vault on the shoreline. Additionally, under the current proposal, raw water intake pipes would be installed using a horizontal directional drilling technique rather than by surface excavation. On October 28, 2010, TVA issued a second revised FONSI for these modifications.
PDF files require Adobe Acrobat Reader.
Environmental Assessment (PDF, 1 mb)
Finding of No Significant Impact (PDF, 92 kb)
First Revised Finding of No Significant Impact (PDF, 4.2 mb)
Second Revised Finding of No Significant Impact (PDF, 290 kb)
For additional information contact:
James F. Williamson, Senior NEPA Specialist
Tennessee Valley Authority
400 West Summit Hill Drive, WT 11D
Knoxville, Tennessee 37902