Proposed Section 26A Approval to Knoxville Utilities Board for Sewer Line and Water Main Crossing Fort Loudoun Reservoir, Tennessee River Mile 646.6. Tennessee Valley Authority. Final Environmental Assessment

摘要

The Knoxville Utilities Board (KUB) proposes to replace a section of an existing sewer line originally installed in 1947. The proposed sewer line crosses Fort Loudoun Reservoir at Tennessee River Mile (TRM) 646.6 in Knox County, Tennessee, at a point slightly upstream of the existing line's location. The new sewer line would consist of two ductile iron pipes (DIP) that would be installed using a conventional cut-and-cover method in a 3.5-footdeep trench below the riverbed. A temporary emergency bypass line would be anchored on the river bottom to prevent overflow during rain events. In addition, due to planned rehabilitation of the nearby Henley Street Bridge in 2010, KUB proposes to remove the existing 16-inch water main currently affixed to the bridge and install the water main within the same trench as the proposed new sewer line. Other components of the project include the installation of two concrete manhole junction boxes on either side of the proposed crossing route and associated sewer pipes and manholes as shown in the conceptual layout. The decision before Tennessee Valley Authority (TVA) is whether to issue approval under Section 26a of the TVA Act for the installation of the sewer line and water main crossing beneath the marked navigation channel of the Tennessee River. The proposed project involves a small area of TVA property currently under easement along Neyland Drive and would affect land over which TVA has flowage easement rights on the opposite shore. TVA is not proposing to convey any property rights to KUB. As a result, no land action is associated with the request.