A. Minimum Submittal: Unless one of the following is specifically waived with documentation by the director or the administrator, or the development is eligible for certification by a general certification or letter of permission, a minimum stormwater submittal shall be required for all developments requiring certification. The following constitutes a minimum stormwater submittal:
1. The name and legal address of the applicant and of the owner of the land; and
2. The common address and legal description of the site where the development will take place; and
3. Affidavits signed by the landowner and the developer attesting to their understanding of the requirements of this title and their intent to comply therewith, including the submittal of a record drawing in accordance with subsection B of this section; and
4. A listing of all other required stormwater related permits, a brief description of how the other permits apply to the development, and when requested by the director or the administrator, complete copies of the applications for the permits; and
6. A standard engineering scaled drawing depicting any proposed major stormwater facilities on a topographic map depicting any off site upstream drainage area and the characteristics of the downstream facilities receiving discharge from the development.
7. An exhibit at standard engineering scale is also required that is used as the basis to determine the extent of existing impervious area, proposed developed impervious area, and extent of area to be disturbed in the construction of the development.
8. A statement from the applicant acknowledging that all stormwater submittals shall be made available for inspection and copying by the county, notwithstanding any exemption from inspection and copying for such materials under the Illinois freedom of information act, upon the written request of either: a) the applicant; b) any subsequent owner of the subject property; or c) any governmental unit having planning or drainage jurisdiction within one and one-half (11/2) miles of the subject property.
B. Record Drawings: Upon completion of the stormwater facilities, a record drawing signed and sealed by either a professional engineer or a professional land surveyor depicting the as constructed size, rim and inverts elevations of pipes, stormwater structures and culverts, and contours and flood storage volumes of all required basins of the major stormwater systems and minor stormwater systems.
C. Noting Presence Of On Site Drainage Areas: An informational note acknowledging the presence of on site wetlands, buffers, floodplains and PCBMPs with drainage areas one acre or greater, shall be recorded against the title to alert all future owners and shall reference the stormwater management certification number.
D. Documentation Supporting Certification Compliance: The following items will be submitted to demonstrate and support that the application for certification is in compliance with this title. The administrator or director may approve, in writing, an application without some or all of these items based on the extent and complexity of the development. All plans and drawings shall be at standard engineering scale.
1. A scaled plan or plans illustrating the major and minor conveyance system, including:
a. Size, type, length and inverts of conveyance structures including drainage pipes, culverts, manholes, catch basins, inlets, and drain tiles.
2. A scaled exhibit illustrating the impervious area of the site prior to the certification along with a calculation of the percentage of the site that is impervious.
3. A scaled exhibit illustrating the proposed impervious surfaces of the development.
4. Calculations of the percentage of impervious surfaces after complete construction of the proposed development.
5. Scaled plans illustrating the location of and details for site runoff storage.
6. Calculations that establish the required site runoff storage volume along with calculations confirming that the proposed plan achieves either the site runoff storage or the modified site runoff storage.
7. When site runoff storage special is required, calculations that demonstrate the specified postdevelopment discharges have not exceeded the predevelopment values. (Ord. G-976, 7-24-2012; Ord. G-1003, 6-11-2013)