(A) Concept plan and consultation meeting.
(1) Before a stormwater management permit application is deemed complete, the Stormwater Administrator or developer may request a consultation on a concept plan for the post-construction stormwater management system to be utilized in the proposed development. This consultation meeting should take place at the time of the preliminary plan of subdivision or other early step in the development process. The purpose of this meeting is to discuss the post-construction stormwater management measures necessary for the proposed project, as well as to discuss and assess constraints, opportunities and potential approaches to stormwater management designs before formal site design engineering is commenced. Local watershed plans, the Zebulon and Wendell Open Space and Greenway Master Plan, the Framework Plan (as described in the Town of Zebulon Comprehensive Plan), and other relevant resource protection plans should be consulted in the discussion of the concept plan.
(2) To accomplish this goal, the following information should be included in the concept plan, which should be submitted in advance of the meeting:
(a) Existing conditions/proposed site plans. Existing conditions and proposed site layout sketch plans, which illustrate at a minimum: existing and proposed topography; perennial and intermittent streams; mapping of predominant soils from soil surveys (if available); boundaries of existing predominant vegetation; proposed limits of clearing and grading; and location of existing and proposed roads, buildings, parking areas and other impervious surfaces.
(b) Natural resources inventory. A written and graphic inventory of natural resources at the site and surrounding area as it exists prior to the commencement of the project. This description should include a discussion of soil conditions, forest cover, geologic features, topography, wetlands, and native vegetative areas on the site, as well as the location and boundaries of other natural feature protection and conservation areas such as lakes, ponds, floodplains, stream buffers, flood protection zones, and other setbacks (e.g., drinking water well setbacks, septic setbacks, and the like). Particular attention should be paid to environmentally sensitive features that provide particular opportunities or constraints for development and stormwater management.
(c) Stormwater management system concept plan. A written and graphic concept plan of the proposed post-development stormwater management system including: preliminary selection and location of proposed structural stormwater controls; low-impact design elements; location of existing and proposed conveyance systems such as grass channels, swales, and storm drains; flow paths; location of floodplain/floodway limits; relationship of site to upstream and downstream properties and drainages; and preliminary location of any proposed stream channel modifications, such as bridge or culvert crossings.
(B) Stormwater management permit application.
(a) Downstream impact analysis. As part of the permit application, all development and redevelopment shall perform a downstream impact analysis as specified in § 151.36(A).
(b) Plan certification. All such plans shall be prepared by a qualified registered North Carolina professional engineer, surveyor, soil scientist or landscape architect, and the engineer, surveyor, soil scientist or landscape architect shall perform services only in their area(s) of competence, and shall verify that the design of all stormwater management facilities and practices meets the submittal requirements for complete applications, that the designs and plans are sufficient to comply with applicable standards and policies found in the Design Manual, and that the designs and plans ensure compliance with this chapter.
(2) The submittal shall include all of the information required in the submittal checklist established by the Stormwater Administrator. Incomplete submittals shall be treated pursuant to SECTION 3.B.4.
(Ord. 2010-27, passed 1-6-2010)