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)