Unless granted a waiver or judged by the County Planning and Zoning Department to be exempt, the following performance criteria shall be addressed for the stormwater pollution prevention plan to permanently reduce or minimize the negative aspects of stormwater runoff after land development activities at all sites.
(A) All site designs shall control the stormwater discharge in compliance with county requirements.
(B) The stormwater pollution prevention plan shall be designed, at a minimum, for a storm event equal to or greater than a 25-year, 24-hour rainfall event.
(C) The management practices, controls, and other provisions contained in the stormwater pollution prevention plan must be at least as protective as the requirement contained in the Illinois Urban Manual.
(D) Watercourses shall be protected from degradation through the application of recommended design and construction guidelines in the BMP manual.
(E) Prior to or during the site design process, applicants for land disturbance permits shall consult with the County Planning and Zoning Department to determine if they are subject to additional stormwater pollution prevention plan requirements which may include stormwater discharges:
(1) To waters for which there is a TMDL allocation for sediment or a parameter that addresses sediment (such as total suspended solids, turbidity, or siltation);
(2) To water bodies identified as impaired on the Illinois Section 303(d) list. This includes Lake Decatur and its tributaries, the Sangamon River below the Lake Decatur Dam and Stevens Creek;
(3) To critical areas with sensitive resources (i.e., swimming beaches, recharge areas, water supply reservoirs) that may be subject to additional performance criteria, or may need to utilize or restrict certain stormwater pollution prevention practices;
(4) From “hot spots” that may require the application of specific structural BMPs and pollution prevention practices.
(Res. O-62-9-06, passed 9-14-2006; Ord. O-134-12-19, passed 12-12-2019)