A. Submission of site development stormwater plan.
(1) Any application for major development approval shall include a Site Development Stormwater Plan containing all information required in § 175-177C.
(2) Any application for minor development approval that is subject to this article shall include a Site Development Stormwater Plan containing all information required in § 175-177D.
(3) The Site Development Stormwater Plan shall demonstrate that the proposed development meets the standards of this article.
(4) The Site Development Stormwater Plan shall contain comprehensive hydrologic and hydraulic design calculations for the pre-development and post-development conditions for the design storms specified in § 175-172P.(4). The standards for groundwater recharge and stormwater runoff rate, volume and quality required by § 175-172O., P., and Q. and shall be met using the methods, calculations and assumptions provided in § 175-173.
(5) The application submission requirements of (1) and (2) above shall be in addition to all other applicable application submission requirements of the municipality's land development regulations.
(6) The applicant shall submit 12 copies of the Site Development Stormwater Plan. All required engineering plans shall be in CAD Format 15 or higher, registered and rectified to NAD 1983 State Plane New Jersey FIPS 2900 US Feet or Shape Format NAD 1983 State Plane New Jersey FIPS 2900 US Feet. All other required documents shall be submitted in both paper and commonly used electronic file formats such as .pdf, word processing, database or spreadsheet files.
B. Site development stormwater plan approval. The Site Development Stormwater Plan shall be reviewed as a part of the development review process by the municipal board or official from whom municipal approval is sought. That municipal board or official shall consult the engineer retained by the Planning and/or Zoning Board (as appropriate) to determine if all the checklist requirements have been satisfied and to determine if the project meets the standards set forth in this article.
C. Checklist requirements for major development. Any application for major development approval shall include a Site Development Stormwater Plan containing, at minimum, the following information.
(1) Topographic base map. The Site Development Stormwater Plan shall contain a topographic base map of the site that extends a minimum of 300 feet beyond the limits of the proposed development, at a scale of one inch = 200 feet or greater, showing one-foot contour intervals. The map shall indicate the following: existing surface water drainage, shorelines, steep slopes, soils, highly erodible soils, perennial or intermittent streams that drain into or upstream of any Category One or Pinelands Waters, wetlands and floodplains along with any required wetlands transition areas, marshlands and other wetlands, pervious or vegetative surfaces, existing surface and subsurface human-made structures, roads, bearing and distances of property lines, and significant natural and manmade features not otherwise shown. Hammonton Town or the Pinelands Commission may require upstream tributary drainage system information as necessary.
(2) Environmental site analysis. The Site Development Stormwater Plan shall contain a written description along with the drawings of the natural and human-made features of the site and its environs. This description shall include:
(a) A discussion of environmentally critical areas, soil conditions, slopes, wetlands, waterways and vegetation on the site. Particular attention shall be given to unique, unusual or environmentally sensitive features and to those features that provide particular opportunities for or constraints on development; and
(b) Detailed soil and other environmental conditions on the portion of the site proposed for installation of any stormwater management measures, including, at a minimum:
[1] A soils report based on onsite soil tests;
[2] Location and spot elevations in plan view of all test pits and permeability tests;
[3] Permeability test data and calculations;
[4] Any other required soil or hydrogeologic data (e.g., mounding analyses results) correlated with location and elevation of each test site;
[5] A cross-section of all proposed stormwater management measures with side-by-side depiction of soil profile drawn to scale and seasonal high water table elevation identified; and
[6] Any other information necessary to demonstrate the suitability of the specific proposed stormwater management measures relative to the environmental conditions on the portion(s) of the site proposed for implementation of those measures.
(3) Project description and site plan(s). The Site Development Stormwater Plan shall contain a map (or maps), at the same scale as the topographical base map, indicating the location of existing and proposed buildings, roads, parking areas, utilities, structural facilities for stormwater management and sediment control, and other permanent structures. The map(s) shall also clearly show areas where alterations will occur in the natural terrain and cover, including lawns and other landscaping, and seasonal high groundwater elevations. A written description of the site plan and justification for proposed changes in natural conditions shall also be provided.
(4) Land use planning and source control plan. The Site Development Stormwater Plan shall contain a Land Use Planning and Source Control Plan demonstrating compliance with the erosion control, groundwater recharge, stormwater runoff quantity control and stormwater quality treatment required by this article. This shall include, but is not limited to:
(a) Information demonstrating that the proposed stormwater management measures are able to achieve a minimum 65 percent reduction of the post-construction total nitrogen load, in accordance with § 175-172P.(7).
(b) Where any stormwater generated from high pollutant loading areas or where stormwater will be exposed to source material, information demonstrating that the proposed stormwater management measures are consistent with § 175-172P.(8).
(5) Stormwater management facilities map. The Site Development Stormwater Plan shall contain a Stormwater Management Facilities Map, at the same scale as the topographic base map, depicting the following information:
(a) The total area to be disturbed, paved and/or built upon, proposed surface contours, land area to be occupied by the stormwater management facilities and the type of vegetation thereon, and details of the proposed plan to manage and recharge stormwater; and
(b) Details of all stormwater management facility designs, during and after construction, including discharge provisions, discharge capacity for each outlet at different levels of detention (if applicable) and emergency spillway provisions with maximum discharge capacity of each spillway.
(6) Groundwater mounding analysis. The Site Development Stormwater Plan shall contain a groundwater mounding analysis in accordance with § 175-172G.(1).
(7) Inspection, maintenance and repair plan. The Site Development Stormwater Plan shall contain an Inspection, Maintenance and Repair Plan containing information meeting the requirements of § 175-178B. of this article.
D. Checklist requirements for minor development. Any application for minor development approval that is subject to this article shall include a Site Development Stormwater Plan, certified by a design engineer, containing, at minimum, the following information:
(1) All existing and proposed development, including limits of clearing and land disturbance.
(2) All existing and proposed lot lines.
(3) All wetlands and required wetland transition areas.
(4) The type and location of each green infrastructure stormwater management measure.
(5) A cross sectional drawing of each stormwater management measure showing the associated:
(a) Soil profile;
(b) Soil permeability test elevation;
(c) Soil permeability rate; and
(d) The elevation of, and vertical separation to, the seasonal high water table.
(6) A design engineer's certification that each green infrastructure stormwater management measure will not adversely impact basements or septic systems of the proposed development, in accordance with § 175-172G.(2).
(7) A maintenance plan containing information meeting the requirements of § 175-178B. of this article.
E. Exception from submission requirements. With the exception of C.(7) and D.(7) above, the municipality may modify or waive any required element of the Site Development Stormwater Plan, provided that sufficient information can be provided to demonstrate compliance with the standards of this article. However, application information required in accordance with the Pinelands CMP (N.J.A.C. 7:50-4.2(b)) shall be submitted to the Pinelands Commission, unless the Executive Director of the Pinelands Commission waives or modifies the application requirements.
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