Duluth UDC § 1022

Management Plan Requirements 1. Before a land development permit application is submitted, an applicant may request a pre-submittal meeting with the City of Duluth. The pre-submittal meeting should take place based on an early step in the development process such as before site analysis and inventory (GSMM Section 2.4.2.4) or the stormwater concept plan (GSMM Section 2.4.2.5). The purpose of the pre-submittal meeting is to discuss opportunities, constraints, and ideas for the stormwater management system before formal site design engineering. To the extent applicable, local and regional watershed plans, greenspace plans, trails and greenway plans, and other resource protection plans should be consulted in the pre-submittal meeting. 284 | P a g e Article Ten. Erosion Control and Stormwater Management Applicants must request a pre-submittal meeting with the City of Duluth when applying for a Determination of Infeasibility through the Practicability Policy. 2. The stormwater concept plan shall be prepared using the minimum following steps: a. Develop the site layout using better site design techniques, as applicable (GSMM Section 2.3). b. Calculate preliminary estimates of the unified stormwater sizing criteria requirements for stormwater runoff quality/reduction, channel protection, overbank flooding protection and extreme flood protection (GSMM Section 2.2). c. Perform screening and preliminary selection of appropriate best management practices and identification of potential siting locations (GSMM Section 4.1). 3. The stormwater concept plan shall contain: a. Common address and legal description of the site, b. Vicinity map, and c. Existing conditions and proposed site layout mapping and plans (recommended scale of 1” = 50’), which illustrate at a minimum: i. Existing and proposed topography (minimum of 2-foot contours), ii. Perennial and intermittent streams, iii. Mapping of predominant soils from USDA soil surveys, iv. Boundaries of existing predominant vegetation and proposed limits of clearing and grading, v. Location and boundaries of other natural feature protection and conservation areas such as wetlands, lakes, ponds, floodplains, stream buffers and other setbacks (e.g., drinking water well setbacks, septic setbacks, etc.), vi. Location of existing and proposed roads, buildings, parking areas and other impervious surfaces, vii. Existing and proposed utilities (e.g., water, sewer, gas, electric) and easements, viii. Preliminary estimates of unified stormwater sizing criteria requirements, ix. Preliminary selection and location, size, and limits of disturbance of proposed BMPs, x. Location of existing and proposed conveyance systems such as grass channels, swales, and storm drains, xi. Flow paths, xii. Location of the boundaries of the base flood floodplain, future-conditions floodplain, and the floodway (as applicable) and relationship of site to upstream and downstream properties and drainage, and xiii. Preliminary location and dimensions of proposed channel modifications, such as bridge or culvert crossings. 4. The stormwater management plan shall contain the items listed in this part and be prepared under the direct supervisory control of either a registered Professional Engineer or a registered Landscape Architect licensed in the state of Georgia. Items (iii), (iv), (v), and (vi) shall be sealed and signed by a registered Professional Engineer licensed in the state of Georgia. The overall site plan must be stamped by a design professional licensed in the State of Georgia for such purpose. (GSMM Section 2.4.2.7) a. Natural Resources Inventory b. Stormwater Concept Plan c. Existing Conditions Hydrologic Analysis d. Post-Development Hydrologic Analysis e. Stormwater Management System f. Downstream Analysis g. Erosion and Sedimentation Control Plan h. BMP Landscaping Plan 285 | P a g e Article Ten. Erosion Control and Stormwater Management i. Inspection and Maintenance Agreement j. Evidence of Acquisition of Applicable Local and Non-Local Permits k. Determination of Infeasibility (if applicable) l. Construction Sequencing Plan 5. For redevelopment and to the extent existing stormwater management structures are being used to meet stormwater management standards, the following must also be included in the stormwater management plan for existing stormwater management structures a. As-built Drawings b. Hydrology Reports c. Current inspection of existing stormwater management structures with deficiencies noted d. BMP Landscaping Plans