(A) Stormwater management and other permits required.
(1) A stormwater management permit shall be required if:
(a) The development or a substantial improvement is located in the regulatory floodplain or there is regulatory floodplain within the property boundary; or
(b) The development disturbs more than one acre (43,560 square feet) of ground cover, unless the development solely involves one or more of the following:
1. Installation, renovation or replacement of a septic system, potable water service line or other utility to serve an existing structure;
2. Excavation or removal of vegetation in rights-of-way or public utility easements for the purpose of installing or maintaining utilities not including storm sewers;
3. Maintenance, repair or at grade replacement of existing lawn areas not otherwise requiring a stormwater permit under this chapter; or
4. Maintenance of an existing stormwater facility, not requiring other state or Federal permits or approvals.
(2) All development shall secure all appropriate stormwater management related approvals, including, without limitation, an IDNR-OWR floodway/floodplain construction permit, a USACOE 404 permit and an IDNR-OWR dam safety permit if required, from all Federal, state and regional authorities and other appropriate Federal, state and regional approvals prior to the issuance of a stormwater management permit for areas of a site requiring other approvals.
(B) Permit review fees. All permit fees shall be paid at the time of application. Permit fees shall be established by separate resolution of the permitting authorities. Fees may include, but are not limited to, the cost of permit administration, review and inspections prior to construction, during construction and within the permanent cover establishment period following construction.
(C) Professional seals and certifications required.
(1) The design of stormwater facilities, calculations for the determination of the regulatory floodplain or calculations of the impacts of development shall meet the standards of this chapter and shall be prepared, signed and sealed by a professional engineer. The professional engineer shall provide an opinion that the technical submittal meets the criteria required by this chapter or the applicable certified community ordinance.
(2) (a) For structures (not including earth embankments) that are subject to a differential water pressure greater than three feet, the submittal shall include evidence that the subject design has been reviewed by a qualified professional who shall, as a minimum, have registration as a professional engineer. The reviews shall include stability of the structure under design conditions considering the protection of downstream life and property in the event of a failure. When directed by the Administrator, the calculations submitted for the structures shall be reviewed, signed and sealed by a registered structural engineer.
(b) For projects which include earth embankments which are subjected to a differential water pressure, the submittal shall include evidence that the embankment design and construction specifications are adequate for the design conditions. This review shall include consideration of the existing foundation soils for the embankment, the materials from which the embankment is to be constructed, compaction requirements for the embankment and protection of the embankment from failure due to overtopping. Construction and materials specifications for all embankments shall be included with the plan set submittal. When directed by the Administrator, or when the impounded water pressure differential exceeds three feet, or when appropriate considering the volume impounded and water surface elevation differential to which the embankment is subjected, these calculations may be required to be reviewed, signed and sealed by a qualified geotechnical or structural engineer.
(3) A topographical map of the site, record drawings and other required drawings shall be prepared, signed and sealed by a professional land surveyor or professional engineer and tied to NAVD88 and any FEMA benchmarks.
(Ord. 18-08, passed 1-14-19)