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TDEC accepts model for expanded permit; board hails milestone as state precedent
Summary
Board staff said Tennessee Department of Environment and Conservation reviewed and accepted the water-quality model used to support an expanded permit, a milestone staff said could set a standard for future permits in the state.
The Water Resources Board discussed a milestone in its permit process after staff reported that the Tennessee Department of Environment and Conservation (TDEC) completed its final approval of a water-quality model used to support an expanded permit application. Staff identified a letter from TDEC permit writer Dennis Border in the agenda and cautioned the letter does not constitute an actual permitting decision.
“This letter does not constitute a permitting decision,” a staff member said while presenting the item, but noted that TDEC’s acceptance of the model and recommended contingencies was an important step. Staff described the TDEC commentary as both accepting the model and already discussing post-construction monitoring and other contingencies the agency expects for eventual permit conditions.
Board members and staff characterized the development as a potentially influential precedent. A presenter said the model is likely to “set the standard for the state” and that permit writers are increasingly expecting such modeling with permit applications. Staff traced the effort back to work beginning in 2017 and described it as an eight-year process to develop the modeling approach.
Board members said the model shows, in their view, that additional treated discharge can improve in-stream conditions when the plant’s effluent is cleaner than existing receiving waters. A staff member described the outcome as a ‘‘big milestone’’ and said TDEC’s acceptance could inform future permit reviews and post-construction monitoring expectations.
Why it matters: TDEC’s acceptance of a model used to support an expanded permit is a procedural milestone in the permit process. While the letter is not a permit decision, staff said it signals regulator acceptance of the modeling approach and lays groundwork for post-construction monitoring and permit conditions.
Caveats: Staff emphasized that the letter is not a permit; any final permit would include specific permit conditions set by TDEC and could require additional studies or monitoring. The transcript records no formal board vote on permitting at this meeting.
