2025 3 10 Work Session Packet 1

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ORDINANCE NO. 1138 
Page 6 of 19 
 
(38) Soil or Topsoil means the unconsolidated mineral and organic material on the 
immediate surface of the earth that serves as a natural medium for the growth of plants. 
(39) Steep Slope or Steep Grade means a natural or created slope of 35% grade or 
greater.  
(40) Stormwater means rainfall runoff, snow melt runoff, and surface runoff and 
drainage. 
(41) Stormwater control measure or SCM means permanent practices and measures 
designed to attenuate peak stormwater runoff flow in addition to reducing the discharge 
of pollutants from new development projects or redevelopment projects. 
(42) Stream as defined by TCA 69-3-103(38) “stream” means a surface water that is 
not a wet weather conveyance.   
(43) Stormwater associated with industrial activity is defined in 40 C.F.R. 
122.26(b)(14) and incorporated here by reference. Most relevant to the City is 40 C.F.R. 
122.26(b)(14)(x), which relates to construction activity including clearing, grading, 
filling and excavation activities, including borrow pits containing erodible material. 
Disturbance of soil for the purpose of crop production is exempt from NPDES permit 
requirements, but stormwater discharges from agriculture-related activities that involve 
construction of structures (e.g., barn construction, road construction, pond construction) 
are considered associated with industrial (construction) activity. Maintenance to the 
original line and grade, hydraulic capacity; or to the original purpose of the facility (e.g., 
re-clearing, minor excavation performed around an existing structure necessary for 
maintenance or repair and repaving of an existing road) is not considered a construction 
activity. 
(44) Construction stormwater discharge-related activities mean activities that cause, 
contribute to or result in point source stormwater pollutant discharges. These activities 
may include excavation, site development, grading and other surface disturbance 
activities; and activities to control stormwater including the siting, construction and 
operation of best management practices (BMPs). 
(45) Stormwater Pollution Prevention Plan (SWPPP) is a written site-specific plan 
required by the Tennessee Construction General Permit (CGP) that includes a narrative 
pollution prevention plan and graphical erosion and sediment control plan. In its basic 
form, the plan contains a site map, a description of construction activities that could 
introduce pollutants to stormwater runoff, a description of measures or practices to 
control these pollutants, and erosion and sediment control plans and specifications.  The 
SWPPP should be prepared in accordance with the Tennessee Erosion and Sediment 
Control Handbook (latest edition). 
(46) Take of an endangered species means to harass, harm, pursue, hunt, shoot, wound, 
kill, trap, capture or collect, or attempt to engage in any such conduct. 
(47) Tennessee Erosion and Sediment Control (TDESC) Handbook is a guidance 
issued by the Division of Water Resources for the purpose of developing Stormwater 
Pollution Prevention Plans and Erosion and Sediment Control Plans required by the 
Construction General Permit. 
(48) Temporary stabilization is achieved when vegetation or non-erodible surface has 
been established on the area of disturbance and construction activity has temporarily 
ceased. Under certain conditions, temporary stabilization is required when construction 
activities temporarily cease.  
(49) Treatment chemicals are polymers, flocculants or other chemicals used to reduce 
turbidity in stormwater discharges by chemically bonding to suspended silts and other 
soil materials and causing them to bind together and settle out. Common examples of 
anionic treatment chemicals are polyacrylamide-chitosan (PAM–CS). 
(50) Turbidity is the cloudiness or haziness of a fluid caused by individual particles 
(suspended solids) that are generally invisible to the naked eye, similar to smoke in air. 
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