2870 24 Amending and Supplementing Chapter 25 Section 29 of the Township of West Orange Municipal Code Stormwater Mgmt RedLined 2

24 Ocean 1.18 1.19 1.24 Passaic 1.21 1.27 1.50 Salem 1.20 1.23 1.32 Somerset 1.19 1.24 1.48 Sussex 1.24 1.29 1.50 Union 1.20 1.23 1.35 Warren 1.20 1.25 1.37 § 25-29.6—Sources for Technical Guidance: A. Technical guidance for stormwater management measures can be found in the documents listed below, which are available to download from the Department’s website at: https://dep.nj.gov/stormwater/bmp-manual/. 1. Guidelines for stormwater management measures are contained in the New Jersey Stormwater Best Management Practices Manual, as amended and supplemented. Information is provided on stormwater management measures such as, but not limited to, those listed in Tables 1, 2, and 3. 2. Additional maintenance guidance is available on the Department’s website at: https://dep.nj.gov/stormwater/maintenance-guidance/. B. Submissions required for review by the Department should be mailed to: The Division of Watershed Protection and Restoration, New Jersey Department of Environmental Protection, Mail Code 501-02A, PO Box 420, Trenton, New Jersey 08625-0420. § 25-29.7—Solids and Floatable Materials Control Standards: A. Site design features identified under § 25-29.4f above, or alternative designs in accordance with § 25-29.4g above, to prevent discharge of trash and debris from drainage systems shall comply with the following standard to control passage of solid and floatable materials through storm drain inlets. For purposes of this paragraph, “solid and floatable materials” means sediment, debris, trash, and other floating, suspended, or settleable solids. For exemptions to this standard see § 25-29.7a2 below. 1. Design engineers shall use one of the following grates whenever they use a grate in pavement or another ground surface to collect stormwater from that surface into a storm drain or surface water body under that grate: i. The New Jersey Department of Transportation (NJDOT) bicycle safe grate, which is described in Chapter 2.4 of the NJDOT Bicycle Compatible Roadways and Bikeways Planning and Design Guidelines; or Deleted: Section IV.F Deleted: Section IV.G Deleted: Deleted: Section VII.A.2 Deleted:

25 ii. A different grate, if each individual clear space in that grate has an area of no more than seven (7.0) square inches, or is no greater than 0.5 inches across the smallest dimension. Examples of grates subject to this standard include grates in grate inlets, the grate portion (non-curb-opening portion) of combination inlets, grates on storm sewer manholes, ditch grates, trench grates, and grates of spacer bars in slotted drains. Examples of ground surfaces include surfaces of roads (including bridges), driveways, parking areas, bikeways, plazas, sidewalks, lawns, fields, open channels, and stormwater system floors used to collect stormwater from the surface into a storm drain or surface water body. iii. For curb-opening inlets, including curb-opening inlets in combination inlets, the clear space in that curb opening, or each individual clear space if the curb opening has two or more clear spaces, shall have an area of no more than seven (7.0) square inches, or be no greater than two (2.0) inches across the smallest dimension. 2. The standard in A.1. above does not apply: i. Where each individual clear space in the curb opening in existing curb- opening inlet does not have an area of more than nine (9.0) square inches; ii. Where the municipality agrees that the standards would cause inadequate hydraulic performance that could not practicably be overcome by using additional or larger storm drain inlets; iii. Where flows from the water quality design storm as specified in N.J.A.C. 7:8 are conveyed through any device (e.g., end of pipe netting facility, manufactured treatment device, or a catch basin hood) that is designed, at a minimum, to prevent delivery of all solid and floatable materials that could not pass through one of the following: a. A rectangular space four and five-eighths (4.625) inches long and one and one-half (1.5) inches wide (this option does not apply for outfall netting facilities); or b. A bar screen having a bar spacing of 0.5 inches. Note that these exemptions do not authorize any infringement of requirements in the Residential Site Improvement Standards for bicycle safe grates in new residential development (N.J.A.C. 5:21-4.18(b)2 and 7.4(b)1). iv. Where flows are conveyed through a trash rack that has parallel bars with one-inch (1 inch) spacing between the bars, to the elevation of the Water Quality Design Storm as specified in

d 7.4(b)1). iv. Where flows are conveyed through a trash rack that has parallel bars with one-inch (1 inch) spacing between the bars, to the elevation of the Water Quality Design Storm as specified in N.J.A.C. 7:8; or v. Where the New Jersey Department of Environmental Protection determines, pursuant to the New Jersey Register of Historic Places Rules at N.J.A.C. 7:4- 7.2(c), that action to meet this standard is an undertaking that constitutes an encroachment or will damage or destroy the New Jersey Register listed historic property.

26 § 25-29.8—Safety Standards for Stormwater Management Basins: A. This section sets forth requirements to protect public safety through the proper design and operation of stormwater management BMPs. This section applies to any new stormwater management BMP. B. The provisions of this section are not intended to preempt more stringent municipal or county safety requirements for new or existing stormwater management BMPs. Municipal and county stormwater management plans and ordinances may, pursuant to their authority, require existing stormwater management BMPs to be retrofitted to meet one or more of the safety standards in § 25-29.8c1, c2, and c3 for trash racks, overflow grates, and escape provisions at outlet structures. C. Requirements for Trash Racks, Overflow Grates and Escape Provisions 1. A trash rack is a device designed to catch trash and debris and prevent the clogging of outlet structures. Trash racks shall be installed at the intake to the outlet from the Stormwater management BMP to ensure proper functioning of the BMP outlets in accordance with the following: i. The trash rack shall have parallel bars, with no greater than six-inch spacing between the bars; ii. The trash rack shall be designed so as not to adversely affect the hydraulic performance of the outlet pipe or structure; iii. The average velocity of flow through a clean trash rack is not to exceed 2.5 feet per second under the full range of stage and discharge. Velocity is to be computed on the basis of the net area of opening through the rack; and iv. The trash rack shall be constructed of rigid, durable, and corrosion resistant material and designed to withstand a perpendicular live loading of 300 pounds per square foot. 2. An overflow grate is designed to prevent obstruction of the overflow structure. If an outlet structure has an overflow grate, such grate shall meet the following requirements: i. The overflow grate shall be secured to the outlet structure but removable for emergencies and maintenance. ii. The overflow grate spacing shall be no greater than two inches across the smallest dimension iii. The overflow grate shall be constructed and installed to be rigid, durable, and corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 pounds per square foot. 3. Stormwater management BMPs shall include escape provisions as follows: i. If a

nd corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 pounds per square foot. 3. Stormwater management BMPs shall include escape provisions as follows: i. If a stormwater management BMP has an outlet structure, escape provisions shall be incorporated in or on the structure. Escape provisions include the installation of permanent ladders, steps, rungs, or other features that provide easily accessible means of egress from stormwater management BMPs. With Deleted: Section VIII.C.1, VIII.C.2, and VIII.C.3 Deleted: Deleted: less

27 the prior approval of the municipality pursuant to § 25-29.8c , a free- standing outlet structure may be exempted from this requirement; ii. Safety ledges shall be constructed on the slopes of all new stormwater management BMPs having a permanent pool of water deeper than two and one-half feet. Safety ledges shall be comprised of two steps. Each step shall be four to six feet in width. One step shall be located approximately two and one-half feet below the permanent water surface, and the second step shall be located one to one and one-half feet above the permanent water surface. See § 25-29.8e for an illustration of safety ledges in a stormwater management BMP; and iii. In new stormwater management BMPs, the maximum interior slope for an earthen dam, embankment, or berm shall not be steeper than three horizontal to one vertical. D. Variance or Exemption from Safety Standard A variance or exemption from the safety standards for stormwater management BMPs may be granted only upon a written finding by the municipality that the variance or exemption will not constitute a threat to public safety. E. Safety Ledge Illustration Elevation View –Basin Safety Ledge Configuration § 25-29.9—Requirements for a Site Development Stormwater Plan: A. Submission of Site Development Stormwater Plan 1. Whenever an applicant seeks municipal approval of a development subject to this ordinance, the applicant shall submit all of the required components of the Checklist for the Site Development Stormwater Plan at § 25-29.9c below as part of the submission of the application for approval. 2. The applicant shall demonstrate that the project meets the standards set forth in this ordinance. Deleted: Deleted: VIII.C Deleted: VIII.E Deleted: Deleted: Section IX.C

28 3. The applicant shall submit [specify number] copies of the materials listed in the checklist for site development stormwater plans in accordance with § 25-29.9c of this ordinance. B. Site Development Stormwater Plan Approval The applicant's Site Development project shall be reviewed as a part of the review process by the municipal board or official from which municipal approval is sought. That municipal board or official shall consult the municipality’s review engineer to determine if all of the checklist requirements have been satisfied and to determine if the project meets the standards set forth in this ordinance. C. Submission of Site Development Stormwater Plan The following information shall be required: 1. Topographic Base Map The reviewing engineer may require upstream tributary drainage system information as necessary. It is recommended that the topographic base map of the site be submitted which extends a minimum of 200 feet beyond the limits of the proposed development, at a scale of 1"=200' or greater, showing 2-foot contour intervals. The map as appropriate may indicate the following: existing surface water drainage, shorelines, steep slopes, soils, erodible soils, perennial or intermittent streams that drain into or upstream of the Category One waters, wetlands and flood plains along with their appropriate buffer strips, marshlands and other wetlands, pervious or vegetative surfaces, existing man-made structures, roads, bearing and distances of property lines, and significant natural and manmade features not otherwise shown. 2. Environmental Site Analysis A written and graphic description of the natural and man-made features of the site and its surroundings should be submitted. This description should include a discussion of 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 or constraints for development. 3. Project Description and Site Plans 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

s, 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 Deleted: Section IX.C

29 This plan shall provide a demonstration of how the goals and standards of § 25- 29.3 through § 25-29.5 are being met. The focus of this plan shall be to describe how the site is being developed to meet the objective of controlling groundwater recharge, stormwater quality and stormwater quantity problems at the source by land management and source controls whenever possible. 5. Stormwater Management Facilities Map The following information, illustrated on a map of the same scale as the topographic base map, shall be included: i. Total area to be disturbed, paved 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 control and dispose of stormwater. ii. Details of all stormwater management facility designs, during and after construction, including discharge provisions, discharge capacity for each outlet at different levels of detention and emergency spillway provisions with maximum discharge capacity of each spillway. 6. Calculations i. Comprehensive hydrologic and hydraulic design calculations for the pre- development and post-development conditions for the design storms specified in § 25-29.4 of this ordinance. ii. When the proposed stormwater management control measures depend on the hydrologic properties of soils or require certain separation from the seasonal high-water table, then a soils report shall be submitted. The soils report shall be based on onsite boring logs or soil pit profiles. The number and location of required soil borings or soil pits shall be determined based on what is needed to determine the suitability and distribution of soils present at the location of the control measure. 7. Maintenance and Repair Plan The design and planning of the stormwater management facility shall meet the maintenance requirements of § 25-29.10. 8. Waiver from Submission Requirements The municipal official or board reviewing an application under this ordinance may, in consultation with the municipality’s review engineer, waive submission of any of the requirements in § 25-29.9c1 through § 25-29.9c6 of this ordinance when it can be demonstrated that the information requested is impossible to obtain or it would create a hardship on the applicant to obtain and its absence will not materially affect the review process. §

it can be demonstrated that the information requested is impossible to obtain or it would create a hardship on the applicant to obtain and its absence will not materially affect the review process. § 25-10—Maintenance and Repair: A. Applicability Deleted: Sections III through V Deleted: Section IV Deleted: Section X Deleted: Section IX.C.1 through IX.C.6