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The Administrator may, at his or her discretion, modify the submittal requirements on a case-by-case basis, considering the size, complexity and likelihood that the development will affect the discharge of stormwater.
(Ord. 2019-03, passed 4-15-2019)
(A) The applicant shall, at a minimum, provide the following information on forms or in a format approved by the Administrator:
(1) The names and legal addresses of all owners of the site;
(2) The names and legal addresses of the developer or developers responsible for completing the development according to the plans submitted, the terms and conditions of the permit, and the requirements of this subchapter;
(3) The common address, legal description and parcel identification number (PIN) of all parcels that comprise the site;
(4) The name of the project, the area of the site in acres, and the type of development;
(5) A general narrative description of the development, existing and proposed conditions, and project planning principles considered, including best management practices used;
(6) Copies of all other permits or permit applications as required; and
(7) An engineer’s estimate of the probable construction cost of the stormwater facilities and the installation and maintenance of soil erosion and sediment control measures.
(B) The application shall be signed by all owners and developers identified in division (A)(1) and (2) above, and shall contain their attestation that they have read and understand the provisions of this subchapter, and agree to bind themselves to the permitting authority to comply therewith. If at any time prior to completion, final inspection and approval of the development, the identity of the persons required to be disclosed in division (A)(1) and (2) above changes, an amended application containing the current information shall be filed and the permit shall be amended accordingly.
(Ord. 2019-03, passed 4-15-2019)
All applicants for a stormwater permit shall provide the following basic plan exhibits. Each exhibit may be no more than one drawing for clarity. The specific information to be included on each exhibit shall be as noted below.
(A) All elevations shall be referenced to NAVD-88.
(B) Site topographical map.
(1) Map scales as 1 inch = 50 feet (or less) and accurate to +/- 0.5 feet;
(2) Existing and proposed contours onsite (one-foot-maximum contour interval) and within 100 feet of the site;
(3) Existing and proposed drainage patterns and watershed boundaries;
(4) Delineation of pre-development regulatory floodplain and floodway limits;
(5) Delineation of post-development regulatory floodplain and floodway limits;
(6) Location of cross sections and any other hydrologic or hydraulic computer-modeled features;
(7) Location of all onsite drain tiles;
(8) Boundaries of all wetlands, lakes, ponds, and the like, with normal water elevation noted, showing all areas of wetlands to be impacted, regardless of whether under a permit or if a permit is not required;
(9) Location of all existing buildings and those to remain on the site noted;
(10) Nearest base flood elevations;
(11) FEMA and/or reference benchmarks used; and
(12) All contours used in the calculation of depressional storage highlighted.
(C) General plan view drawing.
(1) Drawing at the same scale as the site topographical map;
(2) Existing major and minor stormwater systems;
(3) Proposed major and minor stormwater systems;
(4) Design details for stormwater facilities (i.e., structure and outlet work detail drawings, and the like);
(5) Scheduled maintenance program for permanent stormwater facilities, including BMPs;
(6) Planned maintenance tasks and schedule for those tasks;
(7) Identification of persons who will be responsible for maintenance;
(8) Permanent government access maintenance easements granted or dedicated to, and accepted by, a government entity;
(9) Proposed regulatory floodplain and floodway location, with the base flood and flood protection elevations noted;
(10) Existing waters of the U.S. including wetlands, a certified wetland determination obtained from NRCS if the development occurs on agricultural land, wetlands and aquatic resources identified in ADID, and required buffers
(11) Directly-connected impervious areas and any offsetting landscaped areas;
(12) All plan areas at elevations below the 100-year, high-water elevation of site runoff storage facilities highlighted; and
(13) Where a critical facility is proposed, the plan shall include the limits of the 500-year floodplain.
(D) Sediment and erosion control plan.
(1) Drawings at the same scale as the site topographical map;
(2) Sediment and erosion control installation measures and schedule;
(3) Existing and proposed roadways, structures, parking lots, driveways, sidewalks and other impervious surfaces;
(4) Limits of clearing and grading;
(5) Special management areas located;
(6) Proposed buffer locations, existing soil types, vegetation, and land cover conditions;
(7) List of maintenance tasks and schedule for sediment and erosion control measures;
(8) The name, address and phone number at which the person responsible for erosion and sediment control may be reached on a 24-hour basis;
(9) The expected two-year and ten-year runoff rates from all offsite areas draining into the site;
(10) Methods for conveying flows through the site during construction. These methods shall include the temporary and permanent stabilization measures to be used to reduce velocity and erosion from flow through the construction zone.
(E) Wetland mitigation plan, if applicable, in accordance with this subchapter.
(Ord. 2019-03, passed 4-15-2019)
The stormwater submittal shall include a narrative discussion and calculations to support a finding by the qualified review specialist that the proposed development complies with the technical requirements of this subchapter. The submittal shall consist, at a minimum, of the following material.
(A) Narrative description of the existing and proposed site drainage patterns and conditions, including description of offsite conditions that help to identify stormwater issues considered in the design.
(B) Schedule for implementation of the site stormwater plan.
(C) Onsite and offsite runoff calculations that address the following:
(1) Documentation of the procedures and assumptions used to calculate hydrologic and hydraulic conditions for sizing major and minor systems;
(2) Cross-section data for open channels;
(3) Hydraulic grade line and water surface elevations under design flow conditions; and
(4) Hydraulic grade line and water surface elevations under base-flood-flow conditions.
(D) Site runoff storage calculations that address the following:
(1) Calculation of hydraulically connected impervious area and corresponding retention volume;
(2) Documentation of the procedures and assumptions used to calculate hydrologic and hydraulic conditions for determining the allowable release rate;
(3) Documentation of the procedures and assumptions used to calculate hydrologic and hydraulic conditions for determining the storage volume;
(4) Elevation-area-storage data and calculations for site runoff storage; and
(5) Elevation-discharge data and calculations specifically related to the outlet control structure depicted in the plan exhibits.
(Ord. 2019-03, passed 4-15-2019)
The applicant shall obtain approval from IDNR-OWR and FEMA, when required, for all new base flood and floodway determinations or as required in this subchapter. Documentation supporting a finding by the qualified review specialist that the proposed development is in compliance with this subchapter, and shall be submitted with the application. At a minimum, the following material shall be submitted for approval with the application.
(A) Regulatory floodplain boundary determina-tion.
(1) Provide source of flood profile information; and
(2) Provide all hydrologic and hydraulic study information for site-specific floodplain studies, unnumbered Zone A area elevation determinations, and floodplain map revisions.
(B) Floodplain fill and compensatory storage calculations. Floodplain fill and compensatory storage calculations for below and above ten-year flood elevation, up to the base flood elevation.
(1) Tabular summary for below and above ten-year flood elevation of fill, compensatory storage and compensatory storage ratios provided in proposed plan; and
(2) Cross sections used for the above calculations.
(C) Floodproofing measures.
(1) Narrative discussion of floodproofing measures including material specifications, calculations, design details and operation summary; and
(2) Flood easements, when required by this subchapter.
(D) Current statewide permits. Current statewide permits and such information that indicates that the development qualifies for the particular permits in question under the regulations established for such permit(s) by IDNR-OWR.
(Ord. 2019-03, passed 4-15-2019)
(A) The applicant shall obtain a permit for all federally regulated activities involving waters of the U.S. from the appropriate federal authorities. The applicant shall obtain a permit from the county (or the certified community) for all developments having a wetland impact. The applicant shall indicate on the plans the location of any onsite wetland mitigation required by a COE permit and, in narrative form, the location of all offsite mitigation.
(B) A wetland submittal in accordance with the detailed requirements of this subchapter shall be required. In general, the submittal will consist of the following material:
(1) Wetland delineation report (COE format);
(2) Calculation of required buffer (including the size and quality when calculated);
(3) Wetland delineation plan, plan view drawing:
(a) All existing and proposed impacted or undisturbed onsite wetlands;
(b) Location of the buffers; and
(c) Planting plan for buffers; and
(d) Identify all required wetland management activities;
(4) For all stream modifications, the following shall be submitted:
(a) A plan and profile of the existing and proposed channel; and
(b) Supporting calculations for channel width, depth, sinuosity, riffle locations and similar features.
(c) If the development will have a wetland impact, the requirements of this subchapter shall be met.
(Ord. 2019-03, passed 4-15-2019)
The permitee is required to submit record drawings of all permitted stormwater facilities. The record drawings shall be signed and sealed by a professional engineer, who shall state that the project as constructed is substantially in conformance with the development as permitted.
(Ord. 2019-03, passed 4-15-2019)
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