2025 3 10 Work Session Packet 1

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Stormwater Management Program Changes Enacted By Ordinance

February 5, 2025

Changes Due to General Updates in the TDEC MS4 Permit Update

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8.

Changes for post-construction stormwater quality designs.

Improved flood protection for developments near sinkholes.

Streamlining design and construction processes.

There will be no “community waters” designation.

Revised rules for buffer vegetation and allowed entry/uses within buffer.

Updated design guidance on infiltration practices.

Updates requirements for as-built plans post construction for permanent stormwater
infrastructure.

Minor changes to FEMA Floodplain Sections 26-196 and 26-197.

Changes to Address TDEC Program Audit Comments for Athens

1.

Revise the Enforcement Response Plan to include an escalation of enforcement to address
persistent non-compliance, repeat or escalating violations, or incidents of major
environmental harm.

Update program to define priority construction activity.

Clarify Construction General Permit requirements related to activities that result in land
disturbance less than one acre when part of a common plan of development.

Changes to Address TDEC MS4 Permit Update Statewide

1.
2.

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Revises rainfall data and methods for calculating Water Quality Volume (WQV).

Adds new policies for the use of Manufactured Treatment Devices and treatment train
approaches.

Enhances channel protection standards.

Requires mapping of known outfalls.

Requires regular system inspections to detect and address illicit discharges.
Establishes new procedures for public education and involvement.

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