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Final stormwater management plans shall contain the following applicable items:

(a) A site plan map(s) in accordance with Section 17.09-5;

(b) Drafting date and contact information for the project engineer, with all other mapping elements and scale consistent with the site plan map;

(c) Location of existing and proposed stormwater discharge points;

(d) Delineation and labeling of all proposed impervious areas and accompanying area computations;

(e) Final design drawings of all proposed stormwater BMPs with unique references to support documentation, prepared in accordance with minimum P&D standards and of sufficient clarity for those responsible for site grading, including:

1. Plan views showing the location of proposed BMPs in combination with the site plan map at a scale of 1 inch equals no more than 100 feet;

2. Additional detail plan view drawings at a scale of 1 inch equals no more than 40 lineal feet, showing proposed 2 foot contours and all critical design features and elevations;

3. Detailed cross-sections and profiles of each BMP showing all critical design features, side slopes, structures, soil profiles and applicable elevations, including seasonal high water table;

4. Detailed drawings or material specifications for inlets or outlets.

(f) Type, size, location and cross-sections of all pipes, open channels, grade stabilization structures and other proposed stormwater conveyance systems, with unique references to support documentation;

(g) Location and size of drainage easements and other areas set aside for stormwater management, and the associated language describing use restrictions and dimensions of proposed drainage easements;

(h) Location of access drives and associated easements and use restrictions to ensure adequate access to stormwater management facilities for future maintenance;

(i) Utility easements as they may affect the grading and erosion control plans;

(j) Location, dimensions and surfacing material or soils data of proposed access lanes and delineation of easements needed to allow future maintenance of all stormwater BMPs in accordance with Section II.E. The minimum width of any access easement shall be 15 feet;

(k) Location of soil borings and soil profile evaluations with surface elevations and unique references to supplemental data sheets including a minimum of (2) two borings per pond footprint, as needed to determine feasibility of any proposed stormwater BMP and to comply with applicable technical standards;

(l) Detailed construction notes explaining all necessary procedures to be followed to properly implement the plan, including planting and landscaping specifications, timing and sequencing of construction and any temporary measures needed to protect BMPs during the construction phase;

Note: Some BMPs, such as infiltration and bioretention practices, are susceptible to sedimentation and may need to be protected during construction or planned for construction later in the project sequence.

(m) A detailed erosion control inspection plan, outlining the critical elements in the plan that need to be surveyed or inspected by a representative of the project engineer, P&D or the municipality, and the timing and notification requirements involved. A form such as DNR Form 3400-187 or other P&D approved form may be used for each inspection.

Note: Any inspections conducted by P&D or the municipality does not waive the permit holder’s responsibility for construction oversight and verification.

(n) A final stormwater BMP maintenance agreement with a cost estimate for annual maintenance activities in accordance with Section II.E.;

(o) Support documentation summarized in accordance with P&D standards, including but not limited to:

1. A narrative summary of the stormwater management plan, briefly explaining any unique information that led to the selection of BMPs, how the proposed plan meets the guiding principles under Section 17.09-2, and the specific stormwater planning requirements under Section 17.09-3.

2. Maps of existing and proposed watersheds, subwatersheds, Tc/Tt flow paths, soil types, hydrologic soil groups, land uses/cover type and accompanying runoff curve numbers within the site and draining into the site from adjacent properties, with unique references to hydrology data summaries and a description of the ultimate receiving water body(s) for off-site discharges;

3. Pre-development and post-development hydrology and pollutant loading (if applicable) data for each watershed, such as peak flows and runoff volumes, as needed to meet the requirements of this ordinance. All major assumptions used in developing input parameters shall be clearly stated and cross-referenced to the maps under Section 17.09-7(e)1.;

4. Impervious surface maps and calculations of runoff volumes and effective infiltration areas;

5. Hydraulic and hydrologic data summaries for all existing and proposed pipes, open channels, grade stabilization structures and other stormwater conveyance systems, and the necessary documentation to demonstrate compliance with the site drainage requirements under Section 17.09-3(f).;

6. BMP design data for each proposed BMP, showing how it complies with applicable technical standards and the requirements of this ordinance;

7. Soil evaluation reports, following the standards in Section 17.11-5, with matching references to map features showing their location and elevations;

8. A cover sheet stamped and signed by a professional engineer registered in the State of Wisconsin indicating that all plans and supporting documentation have been reviewed and approved by the engineer and certifying that they have read the requirements of this ordinance and that, to the best of their knowledge, the submitted plans comply with the requirements;

9. For sites where changes are proposed in stormwater flow paths, flow patterns, drainage basins, or where proposed stormwater discharges may otherwise have a significant negative impact on downstream property owner(s), P&D may require the applicant to submit written authorization or complete other legal arrangements with the affected property owner(s)

(p) Other items deemed necessary by P&D to ensure compliance with the requirements of this ordinance.

Note: A Stormwater Management Plan Requirements Checklist shall accompany all final stormwater management plan submittals. The checklist can be obtained on the Kenosha County website or by contacting P&D. [Code § 17.09-7.]