Requirements for a Site Development Stormwater Plan.
1. Submission of Site Development Stormwater Plan.
a. Whenever an applicant seeks municipal approval of a site development that is subject to this section, the applicant shall submit all of the required components of the Checklist for the Site Development Stormwater Plan at Subsection 3 below as part of the applicant's application for subdivision or site plan approval. These required components are in addition to any other information required under any provisions of Medford Township's Land Use Ordinance or by the Pinelands Commission pursuant to N.J.A.C. 7:50-1.1 et seq.
b. The applicant shall demonstrate that the site development project meets the standards set forth in this section.
c. The applicant shall submit three copies of the materials listed in the checklist for site development stormwater plans in
accordance with Subsection 3 of this section.
2. Site Development Stormwater Plan Approval.
a. The applicant's site development stormwater plan shall be reviewed as a part of the subdivision or site plan 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 of the checklist requirements have been satisfied and to determine if the project meets the standards set forth in this section.
3. Checklist Requirements. Any application for approval of a major development shall include at least the following information. All required final engineering plans shall be submitted to Medford Township and the Pinelands Commission in CAD format if available, registered and rectified to NJ State Plane Feet NAD 83 or Shape Format NJ State Plane Feet NAD 83, and all other documents shall be submitted in both paper and commonly used electronic file formats such as pdf, word processing, database or spreadsheet files if available. Three copies of each item shall be submitted.
a. Topographic Base Map. The applicant shall submit a topographic base map of the site which extends a minimum of 300 feet beyond the limits of the proposed development, at a scale of one inch equals 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 1 or Pinelands waters, wetlands and floodplains along with their appropriate buffer strips, 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 man-made features not otherwise shown. Medford Township or the Pinelands Commission may require upstream tributary drainage system information as necessary.
b. Environmental Site Analysis. The applicant shall submit a written description along with the drawings of the natural and human-made features of the site and its environs. This description should include:
(1) A discussion of environmentally critical areas, soil conditions, slopes, wetlands, waterways and vegetation on the site. Particular attention should be given to unique, unusual or environmentally sensitive features and to those that provide particular opportunities for or constraints on development; and
(2) Detailed soil and other environmental conditions on the portion of the site proposed for installation of any stormwater BMPs, including, at a minimum: a soils report based on on-site soil tests; locations and spot elevations in plan view of test pits and permeability tests; permeability test data and calculations; and any other required soil data (e.g., mounding analysis results) correlated with location and elevation of each test site; cross-section of proposed stormwater BMP with side-by-side depiction of soil profile drawn to scale and seasonal high-water table elevation identified; and any other information necessary to demonstrate the suitability of the specific proposed structural and nonstructural stormwater management measures relative to the environmental conditions on the portion(s) of the site proposed for implementation of those measures.
c. Project Description and Site Plan(s). The applicant shall submit a map (or maps) at the scale of 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.
d. Land Use Planning and Source Control Plan.
(1) The applicant shall submit a detailed land use planning and source control plan which provides a description of how the site will be developed to meet the erosion control, groundwater recharge and stormwater runoff quantity and quality standards at
§ DR-509E through use of nonstructural or low-impact development techniques and source controls to the maximum extent practicable before relying on structural BMPs. The land use planning and source control plan shall include a detailed narrative and associated illustrative maps and/or plans that specifically address how each of the following nine nonstructural strategies identified in Subchapter 5 of the NJDEP Stormwater Management Rules (N.J.A.C. 7:8-5) and set forth below [Subsection 3.d(1)(a) through (i)] will be implemented to the maximum extent practicable to meet the standards at
§ DR-509E of this section on the site. If one or more of the nine nonstructural strategies will not be implemented on the site, the applicant shall provide a detailed rationale establishing a basis for the contention that use of the strategy is not practicable on the site.
(a) Protect areas that provide water quality benefits or areas particularly susceptible to erosion and sediment loss;
(b) Minimize impervious surfaces and break up or disconnect the flow of runoff over impervious surfaces;
(c) Maximize the protection of natural drainage features and vegetation;
(d) Minimize the decrease in the predevelopment "time of concentration";
(e) Minimize land disturbance, including clearing and grading;
(f) Minimize soil compaction and all other soil disturbance;
(g) Provide low-maintenance landscaping that provides for the retention and planting of native plants and minimizes the use of lawns, fertilizers and pesticides, in accordance with N.J.A.C. 7:50-6.24;
(h) Provide vegetated open-channel conveyance systems discharging into and through stable vegetated areas; and
(i) Provide other source controls to prevent or minimize the use or exposure of pollutants at the site in order to prevent or minimize the release of those pollutants into stormwater runoff. These source controls shall include, but are not limited to:
i. Site design features that help to prevent accumulation of trash and debris in drainage systems;
ii. Site design features that help to prevent discharge of trash and debris from drainage systems;
iii. Site design features that help to prevent and/or contain spills or other harmful accumulations of pollutants at industrial or commercial developments; and
iv. Applying fertilizer in accordance with the requirements established under the Soil Erosion and Sediment Control Act, N.J.S.A. 4:24-39 et seq., and implementing rules, when establishing vegetation after land disturbance.
(2) For sites where stormwater will be generated from "high-pollutant loading areas" or where stormwater will be exposed to "source material," as defined in
§ DR-509B of this section, the applicant shall also demonstrate in the land use planning and source control plan that the requirements of Subsection E have been met.
(3) The use of nonstructural strategies to meet the performance standards in
§ DR-509E of this section is not required for development sites creating less than one acre of disturbance. However, each application for major development and any other application where Medford Township otherwise requires a landscaping plan shall contain a landscaping or revegetation plan in accordance with the CMP standards at N.J.A.C. 7:50-6.24(c). In addition, the applicant shall demonstrate that, at a minimum, existing trees and vegetation on the development site will be preserved and protected according to the minimum standards established by provisions of the Medford Township Land Use Ordinance, Zoning Ordinance or by conditions of zoning or variance approval.
e. Stormwater Management Facilities Map. The applicant shall submit a map, at the same scale as the topographic base map, depicting the following information:
(1) 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 dispose of stormwater; and
(2) 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.
f. Calculations (Groundwater Recharge and Stormwater Runoff Rate, Volume and Quality). The applicant shall submit comprehensive hydrologic and hydraulic design calculations for the predevelopment and post-development conditions for the design storms specified in
§ DR-509D. The standards for groundwater recharge and stormwater runoff rate, volume and quality required by
§ DR-509E shall be met using the methods, calculations and assumptions provided in
§ DR-509D.
g. Inspection, Maintenance and Repair Plan. The applicant shall submit a detailed plan describing how the proposed stormwater management measure(s) shall meet the maintenance and repair requirements of Subsection
G of this section. Said plan shall include, at a minimum, the following elements:
(1) The frequency with which inspections will be made;
(2) The specific maintenance tasks and requirements for each proposed structural and nonstructural BMP;
(3) The name, address and telephone number for the entity responsible for implementation of the maintenance plan;
(4) The reporting requirements; and
(5) Copies of the inspection and maintenance reporting sheets.
h. Exception from Submission Requirements. An exception may be granted from submission of any of these required components (except Subsection 3.g above, Inspection, Maintenance, and Repair Plan) if its absence will not materially affect the review process. However, items required pursuant to the application requirements in the Pinelands CMP [N.J.A.C. 7:50-4.2(b)] shall be submitted to the New Jersey Pinelands Commission unless the Executive Director waives or modifies the application requirements.
Methodologies for the Calculation of Stormwater Runoff Rate and Volume, Stormwater Runoff Quality, and Groundwater Recharge. See
§ DR-509D for detailed information.
Stormwater Management Performance Standards for Major Development. See
§ DR-509E for detailed information.
Design, Construction, and Safety Standards for Structural Stormwater Management Measures. See
§ DR-509Ffor detailed information.
Penalties.
1. Any person who erects, constructs, alters, repairs, converts, maintains, or uses any building, structure or land in violation of this section shall be subject to the penalties of
SECTION 1000: Administration, Waivers, Enforcement, Violations and Penalties.
Appendixes. See
§ DR-509K for more information.
Additional Sources for Technical Guidance. See
§ DR-509L for more information.
