2025 2 10 Work Session PACKET 1

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ORDINANCE NO. 1138 
Page 14 of 26 
 
(a) Construction buffer zones shall include water quality buffers and buffer zones as 
defined in 14-502 above and shall meet the requirements in this ordinance and the 
TN CGP, as amended. The criteria for the width of the construction buffer zone 
can be established on an average width basis at a project, as long as the minimum 
width of the buffer zone is equal to or greater than the required minimum width at 
any measured location. 
 
(b) If the new development or redevelopment site encompasses both sides of a 
stream, buffer averaging can be applied to both sides but must be applied 
independently.  
 
(c) Water quality riparian buffer widths are measured from the top of bank also 
referred to as the “ordinary high-water mark.”  
 
(d) Construction buffers are not primary sediment control measures and shall not be 
relied on as such.  
(e) All stormwater discharges must enter the water quality riparian buffer zone as 
sheet flow, not as concentrated flow, where site conditions allow. The 
designer/operator must comply with the vegetation requirements and the 
permissible land uses set forth for buffers in the TN CGP.  
 
(f) Where it is not practicable to maintain a construction water quality riparian 
buffer, BMPs providing equivalent protection to a receiving stream as a natural 
water quality riparian buffer must be used. 
(13) Notice of Termination (NOT) - The operator shall provide the City with a copy of 
the NOT once it is issued by TDEC. 
14-504. Permanent stormwater management: D
 esign and Construction. 
(1) In order to comply with the City’s permanent stormwater standards for new development 
and redevelopment projects, operators shall design and install SCMs as established by 
Tennessee Rule 0400-40-10-.04 and comply with other requirements of Tennessee Rule 
0400-40-10-.04. 
(2) The Post Construction/Permanent water quality design storm is a 1-year, 24-hour storm 
event. Actual project WQTV requirements shall be based on the proposed permanent 
SCM treatment type as outlined in 4.2.5.2 of the Small MS4 General Permit NPDES 
Permit TNS000000.   
(3) SCMs must be designed to provide full treatment capacity within 72 hours following the 
end of the preceding rain event for the life of the new development or redevelopment 
project. The operator may use any design manuals approved as part of the City’s BMP 
Manual.  
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