(A) Generally. All permit submittals shall include the material listed in the sections noted in Table 2 for the applicable type of development, unless the submittal requirements are specifically modified by the procedure in division (B) below.
Table 2: Permit Submittal Requirements | |||||||
Required Submittals (refer to Sections listed for specific material) Section No./Description | |||||||
151.082(C) | 151.082 (D) | 151.082(E) | 151.082 (F) | 151.083(A) | 151.083(B) | ||
Application and Project Overview | Plan Set Submittal | Stormwater Submittal | Floodplain Submittal | Performance Security | Maintenance Schedule and Funding | Record Drawings | |
All requiring a permit | X | X | X | X | X | ||
151.082( C) | 151.082 (D) | 151.082( E) | 151.082 (F) | 151.083(A) | 151.083(B) | ||
Application and Project Overview | Plan Set Submittal | Stormwater Submittal | Floodplain Submittal | Performance Security | Maintenance Schedule and Funding | Record Drawings | |
All developments on sites with floodplains | X | X | X | X | X | X | |
All developments on sites with or adjacent to waters of the United States | X | X | X | X | X | ||
All applications requesting variances | X | X | X | If on site | X | X | X |
All requiring detention/retent ion | X | X | X | X | X | X | |
Note: Corporations with a bond rating of “A” of higher from a major investment firm, (i.e. Standard and Poor, Moody or equivalent), would be judged to have met the long-term maintenance funding requirement | |||||||
(B) Modification of submittal requirements. 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 a development will affect the discharge of stormwater. The modifications shall be requested and answered in writing. The Administrator's response shall note the relevant findings and be specific as to what submittal requirements are changed. The Director shall be copied on all related correspondence. The Administrator may not modify submittal requirements for any aspect of the development requiring state or federal permits or approvals, nor for any application in which any variance of the permitting authority's ordinance is requested.
(C) Application and project overview. The applicant shall provide the following information as a minimum, on forms or in a format approved by the Administrator:
(1) The name and legal address of the owner(s) of the site and the permit applicant;
(2) The common address, legal description, property identification number (PIN) of the site;
(3) The name of the project, area of the site in acres, type of development;
(4) A general narrative description of the development, existing and proposed conditions, and project planning principles considered, including best management practices used;
(5) Affidavits signed by the owner or the applicant's authorized representative attesting to their understanding of the requirements of this chapter or the applicable certified community ordinance and their intent to comply therewith;
(6) A statement of opinion by a qualified person either denying or acknowledging the presence of floodplain on the development site;
(7) Copies of other stormwater related permits or permit applications as required;
(8) A subsurface drainage investigation report; and
(9) An engineer's estimate of probable construction cost of the stormwater facilities.
(D) Plan set submittal. All applicants for a stormwater permit shall provide the following basic plan exhibits: site topographic map, general plan view drawing, sediment/erosion control plan and a vicinity topographic map. Each exhibit may be on more than one drawing for clarity. The specific information to be included on each exhibit shall be as noted below.
(1) Site topographic map meeting the following requirements shall be submitted:
(a) Map scales as one inch equals 100 feet (or less) and accurate to +/- 0.5 feet;
(b) Existing and proposed contours on-site and within 100 feet of site;
(c) Existing and proposed drainage patterns and watershed boundaries;
(d) Delineation of pre-development regulatory floodplain/floodway limits;
(e) Delineation of post-development regulatory floodplain/floodway limits;
(f) Location of cross-sections and any other hydrologic/hydraulic computer modeled features;
(g) Location of all on-site drain tiles;
(h) Boundary of all wetlands, lakes, ponds and the like with normal water elevation noted;
(i) Location of all existing buildings and those to remain on the site noted;
(j) Nearest base flood elevations;
(k) FEMA and any site-specific benchmarks (tied to county benchmarks) used; and
(l) Highlight all contours used in the calculation of depressional storage.
(2) General plan view drawing meeting the following requirements shall be submitted:
(a) Drawing at the same scale as the site topographic map;
(b) Existing major and minor stormwater systems;
(c) Proposed major and minor stormwater systems;
(d) Design details for stormwater facilities (i.e. structure and outlet work detail drawings and the like);
(e) Scheduled maintenance program for permanent stormwater facilities including BMP measures;
(f) Planned maintenance tasks and schedule;
(g) Identification of entities responsible for maintenance;
(h) Permanent public access maintenance easements granted or dedicated to, and accepted by, a government entity;
(i) Proposed regulatory floodplain and floodway location (with the base flood and flood protection elevations noted); and
(j) Highlight all plan areas at elevations below the 100-year high water elevation of site runoff storage facilities.
(3) Sediment and erosion control plan meeting the following requirements shall be submitted:
(a) Drawings at the same scale as the site topographic map;
(b) Sediment/erosion control installation measures and schedule;
(c) Existing and proposed roadways, structures, parking lots, driveways, sidewalks and other impervious surfaces;
(d) Limits of clearing and grading;
(e) Floodplain/floodway locations;
(f) Proposed buffer location, existing soil types, vegetation and land cover conditions; and
(g) List of maintenance tasks and schedule for sediment/erosion control measures.
(4) Vicinity topographic map meeting the following requirements shall be submitted:
(a) Vicinity topographic map identifying all off-site areas draining to the development and downstream to the receiving intermittent or perennial stream (a two-foot contour map is preferred at a scale readable by the reviewer but aUSGS quadrangle map is acceptable);
(b) Watershed boundaries for areas draining through or from the development;
(c) Soil types related to hydrologic soils group, vegetation and land cover affecting runoff upstream of the site for any area draining through the site;
(d) Location of development site within the major watershed(s); and
(e) Show the overland flow path from the downstream end of the development to the receiving intermittent or perennial stream.
(E) Stormwater submittal. The stormwater submittal shall include narrative discussion and calculations to support a finding that the proposed development complies with the technical requirements of the permitting authority's ordinance. The submittal shall consist of, at a minimum, the following material:
(1) A narrative description of the existing and proposed site drainage patterns and conditions. Include description of off-site conditions, which help to identify stormwater issues considered in the design;
(2) A schedule for implementation of the site stormwater plan;
(3) On-site and off-site runoff calculations which address the following:
(a) Documentation of the procedures/assumptions used to calculate hydrologic and hydraulic conditions for sizing major and minor systems;
(b) Cross-section data for open channels;
(c) Hydraulic grade line and water surface elevations under design flow conditions; and
(d) Hydraulic grade line and water surface elevations under base flood flow conditions.
(4) Site runoff storage calculations, which address the following:
(a) Calculation of hydraulically connected impervious area and corresponding retention volume;
(b) Documentation of the procedures/assumptions used to calculate hydrologic and hydraulic conditions for determining the allowable release rate;
(c) Documentation of the procedures/assumptions used to calculate on-site depressional storage;
(d) Documentation of the procedures/assumptions used to calculate hydrologic and hydraulic conditions for determining the storage volume;
(e) Elevation-area-storage data and calculations for site runoff storage;
(f) Elevation-discharge data and calculations specifically related to the outlet control structure depicted in the plan exhibits; and
(g) The general plan view drawing of division (C)(2) above shall indicate the areas of directly connected impervious areas and any offsetting landscaped areas as defined in § 151.022(E).
(F) Floodplain submittal. The applicant shall obtain approval from IDNR-OWR and FEMA for all new base flood and floodway determinations for those cases in which their permitting authority applies or as noted in § 151.061 of this chapter. The stormwater management permit will not be issued until approval is received, Documentation supporting a finding that the proposed development is in compliance with §§ 151.060 and 151.061 shall be submitted with the application. At a minimum, the following material shall be submitted for approval with the application:
(1) Regulatory floodplain boundary determination:
(a) Provide source of flood profile information; and
(b) Provide all hydrologic and hydraulic study information for site-specific floodplain studies, unnumbered Zone A area elevation determinations and floodplain map revisions.
(2) Floodway hydrologic and hydraulic analyses for the following conditions:
(a) Existing conditions (land used and stream systems);
(b) Proposed conditions (land used and stream systems);
(c) Tabular summary of 100-year flood elevations and discharges for existing and proposed conditions;
(d) Calculations used for model development; and
(e) Hydraulic/hydrologic computer model input/output.
(3) Floodplain fill and compensatory storage calculations for below and above ten-year flood elevation up to the base flood elevation:
(a) Tabular summary for below and above ten-year flood elevation of fill, compensatory storage and compensatory storage ratios provided in proposed plan; and
(b) Cross-sections used for the above calculations.
(4) Floodproofing measures: narrative discussion of floodproofing measures including material specifications, calculations and design details, operation summary; and
(5) Flood easements when required by this chapter or the applicable certified community ordinance.
(Ord. 18-08, passed 1-14-19)