2. For purposes of TSS reduction calculations, Table 2 below presents the presumed removal rates for certain Stormwater Best Management Practices (BMP) designed in accordance with the New Jersey Stormwater Best Management P ractices M anual. TSS reduction shall be calculated based on the removal rates for the BMPs in Table 2 below. Alternative removal rates and methods of calculating removal rates may be used if the design engineer provides documentation demonstrating the capability of these alternative rates and methods to the review agency. A copy of any approved alternative rate or method of calculating the removal rate shall be provided to the following address: Division of Watershed Management, NJDEP , PO Box 418 Trenton, New Jersey, 086250418.
3. If more than one BMP in series is necessary to achieve the required 80 percent TSS reduction for a site, the applicant shall utilize the following formula to calculate TSS reduction:
R.= A + B (AXB)/100
Where
R.= total TSS percent load removal from application of both BMPs, and
A.= the TSS percent removal rate applicable to the first BMP
B.= the TSS percent removal rate applicable to the second BMP
4. If there is more than one onsite drainage area, the 80 percent TSS removal rate shall apply to each drainage area, unless the runoff from the subareas converge on site in which case the removal rate can be demonstrated through a calculation using a weighted average.
5. Stormwater management measures shall also be designed to reduce, to the maximum extent feasible, the post-construction nutrient load of the anticipated load from the developed site in stormwater runoff generated from the water quality design storm. In achieving reduction of nutrients to the maximum extent feasible, the design of the site shall include nonstructural strategies and structural measures that optimize nutrient removal while still achieving the Design and Performance standards listed herein.
6. Additional information and examples are contained in the New Jersey Stormwater Best Management Practices Manual.
7. In accordance with the definition of FW1 at N.J.A.C. 7:9B-1.4, stormwater management measures shall be designed to p revent any increase in stormwater runoff to waters classified as FW1.
H. Safety Standards for Stormwater Management Basins
1. This section sets forth requirements to protect public safety through the proper design and operation o f stormwater m anagement basins. This section applies to any new stormwater management basin.
2. Requirements for Trash Racks, Overflow Grates and Escape Provisions
(a) 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 basin to ensure proper functioning of the basin outlets in accordance with the following:
(1) The trash rack shall have parallel bars, with no greater than six inch spacing between the bars. Trash racks shall be installed at the intake to the outlet structure as appropriate, and shall have parallel bars with one-inch (1") spacing between the bars to the elevation of the water quality design storm. For elevations higher than the water quality design storm, the parallel bars at the outlet structure shall be spaced no greater than one-third (1/3) the width of the diameter of the orifice or one-third (1/3) the width of the weir, with a minimum spacing between bars of one-inch and a maximum spacing between bars of six inches.
(2) The trash rack shall be designed so as not to adversely affect the hydraulic performance of the outlet pipe or structure.
(3) 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.
(4) The trash rack shall be constructed and installed to be rigid, durable, and corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 lbs/ft. sq.
(b) 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:
(1) The overflow grate shall be secured to the outlet structure but removable for emergencies and maintenance.
(2) The overflow grate spacing shall be no less than two inches across the smallest dimension.
(3) 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 lbs./ft sq.
(c) For purposes of this paragraph, escape provisions mean the permanent installation of ladders, steps, rungs, or other features that provide easily accessible means of egress from stormwater management basins. Stormwater management basins shall include escape provisions as follows:
(1) If a stormwater management basin has an outlet structure, escape provisions shall be incorporated in or on the structure.
(2) Safety ledges shall be constructed on the slopes of all new stormwater management basins having a permanent pool of water deeper than two and one-half feet. Such 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 Standard Detail on file in the Department of Planning and Engineering.
(3) In new stormwater management basins, the maximum interior slope for an earthen dam, embankment, or berm shall not be steeper than 3 horizontal to 1 vertical.
3. Waiver from Safety Standards
a. A waiver from the safety standards for stormwater management basins may be granted only upon a written finding by the appropriate municipal reviewing agency that the waiver will not constitute a threat to public safety.
I. Maintenance and Repair
1. General Maintenance- The design engineer shall prepare a maintenance plan for the stormwater management measures incorporated into the design of a major development. Maintenance guidelines for stormwater management measures are available in the New Jersey Stormwater Best Management Practices Manual.
2. The maintenance plan shall contain:
a. Specific preventative maintenance tasks and schedules
(1) Preventative and corrective maintenance shall be performed to maintain the function of the stormwater management measure, including repairs or replacement to the structure; removal of sediment, debris, or trash; restoration of eroded areas; snow and ice removal; fence repair or replacement; restoration of vegetation; and repair or replacement of nonvegetated linings.
(2) The party responsible for maintenance shall maintain a detailed log of all preventative and corrective maintenance for the structural stormwater management measures incorporated into the design of the development, including a record of all inspections and copies of all maintenance-related work orders.
(3) The party responsible for maintenance shall evaluate the effectiveness of the maintenance plan at least once per year and adjust the plan and the deed as needed.
(4) The party responsible for maintenance shall retain and make available, upon request by any public entity with administrative, health, environmental, or safety authority over the site, the maintenance plan and the documentation required herein.
b. Cost estimates, including estimated cost of sediment, debris, or trash removal;
c. Name, address, and telephone number of the party or parties responsible for preventative and corrective maintenance (including replacement).
(1) If the maintenance plan identifies a party other than the developer (for example, a public agency or homeowners' association) as having the responsibility for maintenance, the plan shall include documentation of such party's agreement to assume this responsibility, or of the developer's obligation to dedicate a stormwater management facility to such party under an applicable ordinance or regulation.
(2) Responsibility for maintenance shall not be assigned or transferred to the owner or tenant of an individual property in a residential development or project, unless such owner or tenant owns or leases the entire residential development or project.
(3) If maintenance is not the responsibility of a public agency, the maintenance plan and any future revisions shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan must be undertaken.
3. A two year maintenance guarantee in accordance with N.J.S.A 40:55D-53 shall be required to be posted for all stormwater management facilities that are not dedicated to East Brunswick Township or another governmental agency.
4. In the event that the stormwater management facility becomes a danger to public safety or public health, or if it is in need of maintenance or repair, the municipality shall so notify the responsible party in writing. Upon receipt of that notice, the responsible party shall have fourteen (14) days to effect maintenance and repair of the facility in a manner that is approved by the municipal engineer or designee. The municipality, in its discretion, may extend the time allowed for effecting maintenance and repair for good cause. If the responsible party fails or refuses to perform such maintenance and repair, the municipality or County may immediately proceed to do so and shall bill the cost thereof to the responsible party.
J. Private Storm Drain Inlet Retrofitting Required
1. Private Storm Drain Inlets-Existing storm drain inlets which are in direct contact with repaving, repairing, reconstruction, or resurfacing or alterations of facilities on private property shall be required to be retrofitted to prevent the discharge of solids and floatables (such as plastic bottles cans food wrappers and other litter) to the municipal separate storm sewer system so as to protect public health safe and welfare and to prescribe penalties for the failure to comply.
2. Applicability-For the purpose of this retrofitting requirement "Storm Drain Inlets" means an opening in a storm drain used to collect stormwater runoff and includes but not limited to, a grate inlet, curb-opening inlet, slotted inlet, and combination inlet.
3. Prohibited Conduct- No person in control of private property (except a residential lot with one single family house) shall authorize the repaving, repairing (excluding the repair of individual potholes), resurfacing (including top coating or chip sealing with asphalt emulsion or a thin base of hot bitumen), reconstructing or altering any surface that is in direct contact with an existing storm drain inlet on that property unless the storm drain inlet:
a. Already meets the private storm drain inlet design standards cited in Section 4 below to control passage of solid and floatable materials; or
b. Is retrofitted or replaced to meet the standard cited in Section 4 below prior to the completion of the project.
4. Design Standards-Private storm drain inlets which are in direct contact with repaving, repairing, reconstruction, or resurfacing or alterations of facilities on private property shall comply with the following standards. For purposes of this paragraph, "solid and floatable materials" means sediment, debris, trash, and other floating. suspended, or settleable solids.
a. The following grates shall be used whenever a grate in pavement or another ground surface is used to collect stormwater from that surface into a storm drain or surface water body under that grate:
1) 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 (April 1996); or
2) A different grate, if each individual clear space in that grate has an area of no more than seven CD 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 areas bikeways plazas sidewalks, lawns, fields, open channels, and stormwater basin floors.
b.Whenever a curb-opening inlet is used, 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.
5. Exemptions- This standard does not apply:
a. Where the Manager of Engineering Services or designee agrees that this standard would cause inadequate hydraulic performance that could not practicably be overcome by using additional or larger storm drain inlets that meet these standards;
b. Where flows 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:
1) A rectangular space four and five-eighths inches long and one and one-half inches wide (this option does not apply for outfall netting facilities); or
c. Where flows are conveyed through a trash rack that has parallel bars with one-inch (1") spacing between the bars; or
d. 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.
**Webmasters Note: The previous subsection, J., has been added and the following subsections relettered as per Ordinance No. 09-16.
K. Sources for Technical Guidance
1. Technical guidance for stormwater management measures can be found in the following documents which are available from Maps and Publications, NJDEP, 428 East State Street, P.O. Box 420, Trenton, New Jersey, 08625; telephone (609) 777-1038.
a. Guidelines for stormwater management measures are contained in the New Jersey Stormwater Best Management Practices Manual, as amended. Information is provided on stormwater management measures such as: bioretention systems, constructed stormwater wetlands, dry wells, extended detention basins, infiltration structures, manufactured treatment devices, pervious paving, sand filters, vegetative filter strips, and wet ponds.
b. The NJDEP Stormwater Management Facilities Maintenance Manual, as amended.
c. The NJDEP website at www.njstormwater.org.
2.Additional technical guidance for stormwater management measures can be obtained from the following:
a. The "Standards for Soil Erosion and Sediment Control in New Jersey" promulgated by the State Soil Conservation Committee and incorporated into N.J.A.C. 2:90. Copies of these standards may be obtained by contacting the State Soil Conservation Committee or any of the Soil Conservation Districts listed in N.J.A.C. 2:90-1.3(a)4. The location, address, and telephone number of each Soil Conservation District may be obtained from the State Soil Conservation Committee, P.O. Box 330, Trenton, New Jersey 08625; (609) 292-5540;
b. The Rutgers Cooperative Extension Service, 732-932-9306; and
c. The Soil Conservation Districts listed in N.J.A.C. 2:90-1.3(a)4. The location, address, and telephone number of each Soil Conservation District may be obtained from the State Soil Conservation Committee, P.O. Box 330, Trenton, New Jersey, 08625, (609) 292-5540.
L. Penalties
Any party who erects, constructs, alters, repairs, converts, maintains, or uses any building, structure or land in violation of this ordinance shall be subject to the penalty provisions of the Zoning Chapter of the East Brunswick Township Code.
All streetlights shall be installed on ornamental standards with underground wiring. They shall be of a style and design compatible with the nature and design of the subdivision and shall be approved by the Planning Board. Street lighting shall conform to the current standards prescribed by the Illuminating Engineers Society, with respect to type and number of light stanchions, spacing intervals, location, wattage, shielding and design and shall be installed so as to provide adequate lighting without spillage and to prevent hazard to drivers or nuisance to adjoining property owners.
[Amended 8-25-97 by Ord. No. 97-251
For residential development these standards are superseded by Residential Site Improvement Standards (N.J.A.C., Title 5, Chapter 21).
The number and location of all street signs and other signs needed to regulate and control traffic or for warning purposes shall be determined by the Planning Board in cooperation with the Director of Public Safety. However, there shall', be at least two (2) street signs furnished at each four-way intersection and one (1) street sign at each T-intersection. Prior to the issuance of a construction permit the applicant shall pay to the township the current rate including installation for each sign, as it has been determined by the Director of Public Safety and filed with the Township Clerk. The Township shall provide and install the signs.
[Amended 8-25-97 by Ord. No. 97-25]
For residential development these standards are superseded by Residential Site Improvement Standards (N.J.A.C., Title 5, Chapter 21).
A. Required.
All developments shall be served by paved streets with an all-weather base and pavement with an adequate crown.
B. Utilities Installed.
No streets shall be accepted unless all the utilities for each prospective building lot have been installed to the edge of the right-of-way. All utilities, drains and other facilities located under the road paving shall be installed prior to the placing of any road surfacing material.
C. County Roads.
Wherever a county road passes through or borders a subdivision, the developer shall provide and dedicate to the county such additional land as may be necessary for the widening of the right-of-way to accommodate anticipated traffic in the reasonably foreseeable future, as projected by the County Planning Board.
D. Major Arterials.
Subdivisions abutting major arterials or controlled access highways shall provide a marginal service street or shall have lots backing on to such streets and highways, with a buffer strip for planting or some other means of separation of through and local traffic as the Board may determine appropriate.
E. Minor Arterial Streets.
On minor arterial streets the right-of-way width shall be measured from lot line to lot line and shall be determined by the Planning Board, but in no event shall the right-of-way be less than seventy (70) feet or the paved portion less than fifty (50) feet.
F. Major Collector Streets.
On major collector streets the right-of-way width shall be measured from lot line to lot line and shall be determined by the Planning Board, but in no event shall the right-of-way be less than seventy (70) feet or the paved portion less than fifty (50) feet.
G. Minor Collector Streets.
On minor collector streets the right-of-way width shall be measured from lot line to lot line and shall be determined by the Planning Board, but in no event shall the right-of-way be less than sixty (60) feet or the paved portion less than thirty-six (36) feet.
H. Local Streets.
On local streets the right-of-way width shall be measured from lot line to lot line and shall be determined by the Planning Board, but in no event shall the right-of-way be less than fifty (50) feet or the paved portion less than thirty (30) feet.
I. Streets not on Master Plan.
The arrangements and right-of-way widths of streets not shown on the Master Plan or Official Map shall be such as to provide for the appropriate extension of existing streets.
J. Reserve Strips.
No subdivision showing reserve strips controlling access to streets shall be approved except where the control and disposal of land comprising such strips has been given to the governing body under conditions approved by the Board.
K. Existing Streets.
Subdivisions which adjoin or include existing streets that do not conform to widths as shown on the Master Plan or Official Map or the street width requirements of this subsection shall dedicate additional width along either one (1) or both sides of the street. If the subdivision is along one (1) side only, one-half () of the required extra width shall be dedicated.
L. Grade.
The grade of any street shall not exceed eight percent (8%) except where the Municipal Engineer determines that a steeper grade would help preserve trees or other worthwhile natural features, in which case the grade shall not exceed ten percent (10%). The minimum grade shall be 0.75%.
M. Vertical Grade.
All changes in vertical grade shall be connected by vertical curves of sufficient radius to provide a smooth transition and proper sight distance in accordance with AASHTO Standards.
N. Intersections.
No street or road shall be located within two hundred (200') feet of any existing street or road intersection. Street intersections shall be as nearly at right angles as is possible and in no case shall be at an angle of less than sixty degrees (60)
The block corners at intersections shall be rounded at the curbline with a curve having a radius of not less than fifty (50), except in the case of minor streets where the radius shall not be less than twenty-five (25) feet.
All street jogs at intersections shall provide for at least one hundred fifty (1 50) feet between the nearest right-of-way lines.
A.tangent at least one hundred (1 00) feet long shall be introduced between reverse curves.
When connecting street lines deflect from each other at any one point by more than ten degrees (10 ) and not more than forty-five degrees (45 ), they shall be connected by a curve with a center-line radius of not less than one hundred fifty (150) feet for minor streets, three hundred (300) feet for collector streets and five hundred (500) feet for major arterials and controlled access highways. When connecting street lines deflect from each other at any one point by more than forty-five degrees (45 ), they shall be connected by a curve with a center-line radius of not less than two hundred fifty (250) feet for minor streets, one hundred (100) feet for collector streets and six hundred (600) feet for major arterials and controlled access highways.
O. Cul-de-sac.
Dead-end streets (culs-de-sac) shall not be longer than one thousand (1,000) feet measured from the centerline of the intersection to the centerline of the bulb and shall not have more than twenty (20) lots. Culs-de-sac shall provide a turnaround at the end with a curb radius of not less than forty-five (45) feet in residential subdivisions and eighty (80) feet in industrial subdivisions. A R.O.W. radius of ten (10) additional feet shall be provided in both cases. If a dead-end street is of a temporary nature, a similar turnaround shall be provided, together with appropriate performance guaranties for its removal and reversion of the excess right-of-way to the adjoining properties.
P. Street Names.
No street shall have a name which will duplicate or so nearly duplicate as to be confused with the names of existing streets. The continuation of an existing street shall have the same name. All street names must be approved by the Planning Board.
Q. Driveway Access.
In all residential zones, development bounded by any arterial or collector street shall control access to said streets by having all driveways intersect minor streets. Where the size, shape, location or some other unique circumstance may dictate no other alternative than to have a driveway enter an arterial or collector street, the lot shall provide on-site turnaround facilities so it is not necessary to back any vehicle onto an arterial or collector street.
R. Adjoining Property.
When a development adjoins land capable of being developed or subdivided further, suitable provisions shall be made for access from the adjoining tract to existing or proposed streets.
S. Pavement.
Street pavement shall be constructed in accordance with the Standard Specifications of the New Jersey Department of Transportation. Pavement thickness shall be not less than the following:
1. Major arterial and major collector streets; bituminous stabilized base course, six (6) inches compacted thickness; FABC, two-surface course, two (2) inches compacted thickness.
2. Minor collector and local streets: bituminous stabilized base course, five (5) inches compacted thickness; FABC, one surface course, two (2) inches compacted thickness.
T. Curbs.
The curb return radii for minor streets from collector and arterial streets shall be thirty-five (35) feet. Curbs shall be constructed of Class "B" concrete with dimensions of 6" x 8" x 20" and 6" curbface.
