Company: TVC
Filing Date: 2025-11-13
Form Type: 10-K
Source: 0001376986-25-000056
Chunk: 37

Company: Tennessee Valley Authority
Filing Date: 2025-11-13
Form: 10-K
Item: Item 6
Chunk 37
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 to implement a comprehensive groundwater monitoring program at units subject to the rule.  As a result of this groundwater monitoring program, TVA reported to TDEC in 2017 elevated levels of arsenic, lead, and fluoride in groundwater samples collected from two shallow-aquifer groundwater monitoring wells around the Allen East Ash Disposal Area.  TVA, under the oversight of TDEC, conducted a remedial investigation into the nature and extent of the contamination.  

The remedial investigation confirmed that the high arsenic, fluoride, and lead concentrations are limited to the shallow alluvial aquifer in the north and south areas of the Allen East Ash Disposal Area.  These areas are not adversely impacting the Memphis aquifer, which is the source of the public drinking water supply.  All samples taken from the Memphis aquifer through TVA production wells were within the EPA drinking water standards.  As the result of a pumping test conducted on TVA production wells at the nearby Allen Combined Cycle Plant ("Allen CC") by the United States Geological Survey and the University of Memphis, TVA has committed to not using these production wells until additional data is generated that supports safe use.  TVA constructed water tanks on site and is purchasing cooling water from MLGW in lieu of utilizing the production wells.  Purchasing cooling water in combination with the use of water tanks, rather than wells, could impose some operational limitations, such as limitations on capacity, on the Allen CC due to lower availability of cooling water.

Pursuant to a remedial action plan that has been approved by TDEC, TVA has installed a groundwater pump and treat system at the Allen East Ash Disposal Area.  In addition, TVA is taking steps to close both the East Ash Disposal Area and the nearby West Ash Disposal Area at Allen.  On November 29, 2021, after obtaining the necessary approvals from TDEC, TVA began removing CCR materials to an offsite, lined landfill, and removal and closure activities are expected to continue through 2031.

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Real Property Portfolio 

TVA engages in ongoing Tennessee Valley-wide real property portfolio evaluations of buildings, structures, and land as part of the strategic real estate program, which focuses on reducing cost, right-sizing the portfolio, and aligning real estate holdings with TVA's strategic direction.  TVA is evaluating its use of the Chattanooga Office Complex.  In February 2025, the TVA Board voted to surplus the Missionary Ridge and Blue Ridge buildings at the Chattanooga Office Complex