2025 3 18 Packet 2

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ORDINANCE NO. 1138 
Page 8 of 19 
 
(iii.) TDEC Erosion and Sediment Control Handbook as amended 
(b) The City of Athens has adopted the following design storm events for EPSC 
measures to be used for Construction Stormwater Control Measures. 
Depth/Intensity values shall align with NOAA Atlas data for Athens (Station 40-
0284). The EPSC and sediment BMP construction design storm events are as 
follows: 
(i.) A 2-year 24-hour design storm shall be used for sizing project EPSC and 
BMPs discharging into waters not identified as having unavailable 
parameters or Exceptional Tennessee Waters 
(ii.) A 5-year 24-hour design storm shall be used for sizing project EPSC and 
BMPs discharging into waters with unavailable parameters due to 
siltation or Exceptional Tennessee Waters 
(c) Construction requirements for design storm for all waters as well as special 
conditions for unavailable parameters waters or exceptional Tennessee waters 
shall be consistent with those of the current Tennessee Construction General 
Permit (TNR100000) as amended. 
(2) The City has adopted, for use in design of construction EPSC measures, the design storm 
requirements from the current Tennessee Construction General Permit for all waters as 
well as special conditions for unavailable parameters or Exceptional Tennessee Waters. 
(3) Waste Control Construction site operators are required to minimize the exposure of 
building materials, building products, construction wastes, trash, landscape materials, 
fertilizers, pesticides, herbicides, detergents, sanitary waste and other materials present on 
the site to precipitation and to stormwater. 
(4) Priority Construction  
(a) Priority in construction shall be, at a minimum, construction activities discharging 
directly into, or immediately upstream of, waters the state recognizes as having an 
unavailable condition for siltation or Exceptional Tennessee Waters. 
(b) All priority construction activities must include preconstruction meetings with 
construction site operators for priority construction activities. 
(c) The status of any waters within the City’s jurisdiction shall be determined by 
referencing TDEC’s “EPA Approved List of Impaired and Threatened Waters” 
required by Section 303(d) of the Clean Water Act, as amended. 
(5) Land development permit 
(a) This section shall be applicable to all land development, including, but not limited 
to, site plan applications, subdivision applications, land disturbance applications 
and grading applications. These standards apply to qualifying new development 
or redevelopment site(s). A developer will be required to obtain a land disturbance 
permit from the City in the following cases: 
(i.) New development that involves land development or disturbance 
activities of one (1) acre or more; or, 
(b) Projects of less than one acre of total land disturbance may also be required to 
obtain authorization under this ordinance if: 
(i.) The City has determined that the stormwater discharge from a site is 
causing, contributing to, or is likely to contribute to a violation of a state 
water quality standard; or is likely to be a significant contributor of 
pollutants to water of the state; or, 
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