[Adopted by the Township Council of the Township of Franklin
as indicated in article histories. Amendments noted where applicable.]
[Adopted 3-14-2023 by Ord. No. O-5-23[1]]
[1]
Editor's Note: This ordinance also repealed former Article
I, Stormwater Control Within the Pinelands, adopted 3-12-2019 by Ord. No. O-1-19.
A.
Policy statement. Flood control, groundwater recharge, erosion control
and pollutant reduction shall be achieved using stormwater management
measures, including green infrastructure best management practices
(BMPs) and nonstructural stormwater management strategies. Green infrastructure
BMPs and low-impact development should be utilized to meet the goal
of maintaining natural hydrology to reduce stormwater runoff volume,
reduce erosion, encourage infiltration and groundwater recharge, and
reduce pollution. Green infrastructure BMPs and low-impact development
should be developed based upon physical site conditions and the origin,
nature and the anticipated quantity, or amount, of potential pollutants.
Multiple stormwater management BMPs may be necessary to achieve the
established performance standards for water quality, quantity, and
groundwater recharge contained in this article.
B.
Purpose. The purpose of this article is to establish, within the
Pinelands Area portion of Franklin Township, minimum stormwater management
requirements and controls as authorized by the Pinelands Protection
Act (N.J.S.A. 13:18A-1, et seq.), and consistent with the Pinelands
Comprehensive Management Plan (CMP) (N.J.A.C. 7:50-1.1, et seq.) and
the New Jersey Department of Environmental Protection (NJDEP) Stormwater
Management Regulations (N.J.A.C. 7:8-1.1, et seq.). The standards
in this article are intended to minimize the adverse impact of stormwater
runoff on water quality and water quantity, to facilitate groundwater
recharge, and to control and minimize soil erosion, stream channel
erosion, sedimentation and pollution associated with stormwater runoff.
Moreover, Pinelands Area resources are to be protected in accordance
with the antidegradation policies contained in the New Jersey Surface
Water Quality Standards (N.J.A.C. 7:9B-1.1, et seq.). Additionally,
this article is intended to ensure the adequacy of existing and proposed
culverts and bridges and to protect public safety through the proper
design and operation of stormwater BMPs. If there are any conflicts
between a provision required by the Pinelands CMP and a provision
required by the NJDEP, the Pinelands CMP provision shall apply.
C.
Applicability.
(1)
The terms "development," "major development," and "minor development" are defined in § 335-2 in accordance with the Pinelands CMP (N.J.A.C. 7:50-2.11) and differ from the definitions of "development" and "major development" contained in the NJDEP Stormwater Management Regulations (N.J.A.C. 7:8-1.2).
(2)
This article shall apply within the Pinelands Area to all major development,
and to minor development meeting the following criteria:
(a)
Development involving the construction of four or fewer dwelling
units;
(b)
Development involving any non-residential use and resulting
in an increase of greater than 1,000 square feet of regulated motor
vehicle surfaces; and
(c)
Development involving the grading, clearing, or disturbance
of an area in excess of 5,000 square feet within any five-year period.
For development meeting this criterion, the stormwater management
standards for major development set forth in this article shall apply.
D.
Compatibility with other permit and ordinance requirements.
(1)
Development approvals issued pursuant to this article are to be considered
an integral part of development approvals and do not relieve the applicant
of the responsibility to secure required permits or approvals for
activities regulated by any other applicable code, rule, act, or ordinance.
In their interpretation and application, the provisions of this article
shall be held to be the minimum requirements for the promotion of
the public health, safety, and general welfare.
(2)
This article is not intended to interfere with, abrogate, or annul
any other ordinances, rule or regulation, statute, or other provision
of law except that, where any provision of this article imposes restrictions
different from those imposed by any other ordinance, rule or regulation,
or other provision of law, the more restrictive provisions or higher
standards shall control.
(3)
In the event that a regional stormwater management plan(s) is prepared
and formally adopted pursuant to N.J.A.C. 7:8-1.1, et seq., for any
drainage area(s) or watershed(s) of which Franklin Township is a part,
the stormwater provisions of such a plan(s) shall be adopted by Franklin
Township within one year of the adoption of a Regional Stormwater
Management Plan (RSWMP) as an amendment to an Areawide Water Quality
Management Plan. Local ordinances proposed to implement the RSWMP
shall be submitted to the Pinelands Commission for certification within
six months of the adoption of the RSWMP per N.J.A.C. 7:8 and the Pinelands
CMP.
For the purpose of this article, the following terms, phrases,
words and their derivations shall have the meanings stated herein
unless their use in the text of this article clearly demonstrates
a different meaning. When not inconsistent with the context, words
used in the present tense include the future, words used in the plural
number include the singular number, and words used in the singular
number include the plural number. The word "shall" is always mandatory
and not merely directory. The definitions below are the same as or
based on the corresponding definitions in the NJDEP Stormwater Management
Rules at N.J.A.C. 7:8-1.2, unless otherwise defined in the Pinelands
CMP at N.J.A.C. 7:50-2.11, in which case the definition corresponds
to the CMP definition.
The increase in soil bulk density.
The area from which stormwater runoff drains to a stormwater
management measure, not including the area of the stormwater management
measure itself.
An agency designated by the County Commissioners to review
municipal stormwater management plans and implementing ordinance(s).
The county review agency may either be:
A person professionally qualified and duly licensed in New
Jersey to perform engineering services that may include, but not necessarily
be limited to, development of project requirements, creation and development
of project design and preparation of drawings and specifications.
The change of or enlargement of any use or disturbance of
any land, the performance of any building or mining operation, the
division of land into two or more parcels, and the creation or termination
of rights of access or riparian rights including, but not limited
to:
A change in type of use of a structure or land;
A reconstruction, alteration of the size, or material change
in the external appearance of a structure or land;
A material increase in the intensity of use of land, such as
an increase in the number of businesses, manufacturing establishments,
offices or dwelling units in a structure or on land;
Commencement of resource extraction or drilling or excavation
on a parcel of land;
Demolition of a structure or removal of trees;
Commencement of forestry activities;
Deposit of refuse, solid or liquid waste or fill on a parcel
of land;
In connection with the use of land, the making of any material
change in noise levels, thermal conditions, or emissions of waste
material; and
Alteration, either physically or chemically, of a shore, bank,
or floodplain, seacoast, river, stream, lake, pond, wetlands or artificial
body of water.
|
In the case of development on agricultural land, i.e. lands
used for an agricultural use or purpose as defined at N.J.A.C. 7:50-2.11,
development means: any activity that requires a state permit; any
activity reviewed by the County Agricultural Board (CAB) and the State
Agricultural Development Committee (SADC); and municipal review of
any activity not exempted by the Right to Farm Act, N.J.S.A. 4:1C-1,
et seq.
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The placement or reconstruction of impervious surface or
motor vehicle surface, or exposure and/or movement of soil or bedrock
or clearing, cutting, or removing of vegetation. Milling and repaving
is not considered disturbance for the purposes of this definition.
A geographic area within which stormwater runoff, sediments,
or dissolved materials drain to a particular receiving waterbody or
to a particular point along a receiving water body.
An area or feature which is of significant environmental
value, including but not limited to: stream corridors, natural heritage
priority sites, habitats of endangered or threatened species, large
areas of contiguous open space or upland forest, steep slopes, and
well head protection and groundwater recharge areas. Habitats of endangered
or threatened species are identified using the NJDEP Landscape Project
as approved by the NJDEP Endangered and Nongame Species Program.
The detachment and movement of soil or rock fragments by
water, wind, ice, or gravity.
A stormwater management measure that manages stormwater close
to its source by:
Areas in industrial and commercial developments where solvents
and/or petroleum products are loaded/unloaded, stored, or applied;
areas where pesticides are loaded/unloaded or stored; areas where
hazardous materials are expected to be present in greater than "reportable
quantities" as defined by the United States Environmental Protection
Agency (EPA) at 40 CFR 302.4; areas where recharge would be inconsistent
with NJDEP approved remedial action work plan or landfill closure
plan and areas with high risks for spills of toxic materials, such
as gas stations and vehicle maintenance facilities.
An area within which water drains to a particular receiving
surface water body, also known as a subwatershed, which is identified
by an eleven-digit hydrologic unit boundary designation, delineated
within New Jersey by the United States Geological Survey.
An area within which water drains to a particular receiving
surface water body, also known as a subwatershed, which is identified
by a fourteen-digit hydrologic unit boundary designation, delineated
within New Jersey by the United States Geological Survey.
Small Watershed Hydrology (WINTR-55) Version 1.0, incorporated
herein by reference, as amended and supplemented, available with user
guide and tutorials at http://www.wsi.nrcs.usda.gov/products/W2Q/H&H/Tools_Models/WinTr55.html
or at Natural Resources Conservation Service, 220 Davidson Avenue,
Somerset, NJ 08873. Such surfaces may have varying degrees of permeability.
Is the process by which water seeps into the soil from precipitation.
Any division of land into five or more lots; any construction
or expansion of any housing development of five or more dwelling units;
any construction or expansion of any commercial or industrial use
or structure on a site of more than three acres; or any grading, clearing
or disturbance of an area in excess of 5,000 square feet.
All development other than major development.
Land vehicles propelled other than by muscular power, such
as automobiles, motorcycles, autocycles, and low-speed vehicles. For
the purposes of this definition, motor vehicle does not include farm
equipment, snowmobiles, all-terrain vehicles, motorized wheelchairs,
go-carts, gas buggies, golf carts, ski-slope grooming machines, or
vehicles that run only on rails or tracks.
Any pervious or impervious surface that is intended to be
used by "motor vehicles" and/or aircraft, and is directly exposed
to precipitation including, but not limited to, driveways, parking
areas, parking garages, roads, racetracks, and runways.
The manual maintained by the NJDEP providing, in part, design specifications, removal rates, calculation methods, and soil testing procedures approved by the NJDEP as being capable of contributing to the achievement of the stormwater management standards specified in this article. The BMP Manual is periodically amended by the NJDEP as necessary to provide design specifications on additional best management practices and new information on already included practices reflecting the best available current information regarding the particular practice and the NJDEP's determination as to the ability of that best management practice to contribute to compliance with the standards contained in this article. Alternative stormwater management measures, removal rates, or calculation methods may be utilized, subject to any limitations specified in this article, provided the design engineer demonstrates to the municipality, in accordance with § 335-3F and N.J.A.C. 7:8-5.2(g), that the proposed measure and its design will contribute to achievement of the design and performance standards established by this article.
A chemical element or compound, such as nitrogen or phosphorus,
which is essential to and promotes the development of organisms.
The rate at which water moves through a unit area of soil,
rock, or other material at hydraulic gradient of one.
An individual, corporation, public agency, business trust,
partnership, association, two or more persons having a joint or common
interest, or any other legal entity.
Any dredged spoil, solid waste, incinerator residue, filter
backwash, sewage, garbage, refuse, oil, grease, sewage sludge, munitions,
chemical wastes, biological materials, medical wastes, radioactive
substance [except those regulated under the Atomic Energy Act of 1954,
as amended (42 U.S.C. §§ 2011, et seq.)], thermal waste,
wrecked or discarded equipment, rock, sand, cellar dirt, industrial,
municipal, agricultural, and construction waste or runoff, or other
residue discharged directly or indirectly to the land, ground waters
or surface waters of the state, or to a domestic treatment works.
"Pollutant" includes both hazardous and nonhazardous pollutants.
The amount of water from precipitation that infiltrates into
the ground and is not evapotranspired.
Any of the following, alone or in combination:
A net increase in motor vehicle surface; and/or
The total area of motor vehicle surface that is currently receiving
water quality treatment either by vegetation or soil, by an existing
stormwater management measure, or by treatment at a wastewater treatment
plant, where the water quality treatment will be modified or removed.
The level below the natural surface of the ground to which
water seasonally rises in the soil in most years.
Solid material, mineral or organic, that is in suspension,
is being transported, or has been moved from its site of origin by
air, water or gravity as a product of erosion.
The lot or lots upon which development is to occur or has
occurred.
All unconsolidated mineral and organic material of any origin.
Any material(s) or machinery, located at an industrial facility,
that is directly or indirectly related to process, manufacturing or
other industrial activities, which could be a source of pollutants
in any industrial stormwater discharge to groundwater. Source materials
include, but are not limited to, raw materials; intermediate products;
final products; waste materials; by-products; industrial machinery
and fuels, and lubricants, solvents, and detergents that are related
to process, manufacturing, or other industrial activities that are
exposed to stormwater.
Water resulting from precipitation (including rain and snow)
that runs off the land's surface, is transmitted to the subsurface,
or is captured by separate storm sewers or other sewage or drainage
facilities or conveyed by snow removal equipment.
An excavation or embankment and related areas designed to
retain stormwater runoff. A stormwater management BMP may either be
normally dry (that is, a detention basin or infiltration system);
retain water in a permanent pool (a retention basin); or be planted
mainly with wetland vegetation (most constructed stormwater wetlands).
Any practice, technology, process, program, or other method
intended to control or reduce stormwater runoff and associated pollutants,
or to induce or control the infiltration or groundwater recharge of
stormwater or to eliminate illicit or illegal non-stormwater discharges
into stormwater conveyances.
Water flow on the surface of the ground or in storm sewers,
resulting from precipitation.
The ocean and its estuaries, all springs, streams, wetlands,
and bodies of surface or groundwater, whether natural or artificial,
within the boundaries of the State of New Jersey or subject to its
jurisdiction.
An area within 300 feet of any wetland.
Lands which are inundated or saturated by water at a magnitude,
duration and frequency sufficient to support the growth of hydrophytes.
Wetlands include lands with poorly drained or very poorly drained
soils as designated by the National Cooperative Soils Survey of the
Soil Conservation Service of the United States Department of Agriculture.
Wetlands include coastal wetlands and inland wetlands, including submerged
lands. The "New Jersey Pinelands Commission Manual for Identifying
and Delineating Pinelands Area Wetlands - A Pinelands Supplement to
the Federal Manual for Identifying and Delineating Jurisdictional
Wetlands," dated January 1991, as amended, may be utilized in delineating
the extent of wetlands based on the definitions of wetlands and wetlands
soils contained in N.J.A.C. 7:50-2.11, 6.3, 6.4, and 6.5.
A.
Stormwater management measures for development regulated under this
article shall be designed to provide erosion control, groundwater
recharge, stormwater runoff quantity control and stormwater runoff
quality treatment in accordance with this article.
(1)
Major development shall meet the minimum design and performance standards
for erosion control established under the Soil Erosion and Sediment
Control Act, N.J.S.A. 4:24-39, et seq., and implementing rules at
N.J.A.C. 2:90 and 16:25A.
B.
All development regulated under this article shall incorporate a maintenance plan for the stormwater management measures in accordance with § 335-9.
C.
Stormwater management measures shall avoid adverse impacts of concentrated
flow on habitat for threatened and endangered species in accordance
with N.J.A.C. 7:8-5.2(c) and N.J.A.C. 7:50-6.27 and 6.33.
D.
Tables 1, 2, and 3 below summarize the ability of stormwater best management practices identified and described in the New Jersey Stormwater BMP Manual to satisfy the green infrastructure, groundwater recharge, stormwater runoff quality and stormwater runoff quantity standards specified in § 335-3N, O, P, and Q. When designed in accordance with the most current version of the New Jersey Stormwater BMP Manual and this article, the stormwater management measures found in Tables 1, 2, and 3 are presumed to be capable of providing stormwater controls for the design and performance standards as outlined in the tables below. Upon amendments of the New Jersey Stormwater BMP Manual to reflect additions or deletions of BMPs meeting these standards, or changes in the presumed performance of BMPs designed in accordance with the New Jersey Stormwater BMP Manual, the NJDEP shall publish in the New Jersey Registers a notice of administrative change revising the applicable table. The most current version of the BMP Manual can be found on the NJDEP website at: https://njstormwater.org/bmp manual2.htm.
E.
Where the BMP tables at N.J.A.C. 7:8-5.2(f) differ with Tables 1, 2, and 3 below due to amendment, the BMP Tables at N.J.A.C. 7:8-5.2(f) shall take precedence, except that in all cases the lowest point of infiltration must maintain a minimum separation of two feet to seasonal high water table as required by § 335-3H(2) unless otherwise noted.
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Table 1
Green Infrastructure BMPs for Groundwater Recharge, Stormwater
Runoff Quality, and/or Stormwater Runoff Quantity
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|---|---|---|---|---|
|
Best Management Practice
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Stormwater Runoff Quality TSS Removal Rate
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Stormwater Runoff Quantity
|
Groundwater Recharge
|
Minimum Separation from Seasonal High Water Table
(Feet)
|
|
Cistern
|
0%
|
Yes
|
No
|
—
|
|
Dry well(a)
|
0%
|
No
|
Yes
|
2
|
|
Grass swale
|
50% or less
|
No
|
No
|
2(e)
1(f)
|
|
Green roof
|
0%
|
Yes
|
No
|
—
|
|
Manufactured treatment device(a), (g)
|
50% or 80%
|
No
|
No
|
Dependent upon the device
|
|
Pervious paving system(a)
|
80%
|
Yes
|
Yes(b)
|
2(b)
|
|
No(c)
|
2(c)
| |||
|
Small-scale bioretention basin(a)
|
80% or 90%
|
Yes
|
Yes(b)
|
2(b)
|
|
No(c)
|
1(c)
| |||
|
Small-scale infiltration basin(a)
|
80%
|
Yes
|
Yes
|
2
|
|
Small-scale sand filter(a)
|
80%
|
Yes
|
Yes
|
2
|
|
Vegetative filter strip
|
60% to 80%
|
No
|
No
|
—
|
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Table 2
Green Infrastructure BMPs for Stormwater Runoff Quantity (or
for Groundwater Recharge and/or Stormwater Runoff Quality with a Variance
from N.J.A.C. 7:8-5.3)
| ||||
|---|---|---|---|---|
|
Best Management Practice
|
Stormwater Runoff Quality TSS Removal Rate
|
Stormwater Runoff Quantity
|
Groundwater Recharge
|
Minimum Separation from Seasonal High Water Table
(Feet)
|
|
Bioretention system
|
80% or 90%
|
Yes
|
Yes(b)
|
2(b)
|
|
No(c)
|
1(c)
| |||
|
Infiltration basin
|
80%
|
Yes
|
Yes
|
2
|
|
Sand filter(b)
|
80%
|
Yes
|
Yes
|
2
|
|
Standard constructed wetland
|
90%
|
Yes
|
No
|
2(i)
|
|
Wet pond(d)
|
50% to 90%
|
Yes
|
No
|
2(i)
|
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Table 3
BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or
Stormwater Runoff Quantity only with a Variance from N.J.A.C. 7:8-5.3
| ||||
|---|---|---|---|---|
|
Best Management Practice
|
Stormwater Runoff Quality TSS Removal Rate
|
Stormwater Runoff Quantity
|
Groundwater Recharge
|
Minimum Separation from Seasonal High Water Table
(Feet)
|
|
Blue roof
|
0%
|
Yes
|
No
|
N/A
|
|
Extended detention basin
|
40% to 60%
|
Yes
|
No
|
2
|
|
Manufactured treatment device(h)
|
50% or 80%
|
No
|
No
|
Dependent upon the device
|
|
Sand filter(c)
|
80%
|
Yes
|
No
|
2
|
|
Subsurface gravel wetland
|
90%
|
No
|
No
|
2
|
|
Wet pond
|
50% to 90%
|
Yes
|
No
|
2(i)
|
|
Footnotes to Tables 1, 2, and 3:
| |
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(a)
|
Subject to the applicable contributory drainage area limitation specified at § 335-3N(2).
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(b)
|
Designed to infiltrate into the subsoil.
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(c)
|
Designed with underdrains, where stormwater percolates into
the underdrain through the soils and is not directed to the underdrain
by an outlet control structure.
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|
(d)
|
Designed to maintain at least a ten-foot-wide area of native
vegetation along at least 50% of the shoreline and to include a stormwater
runoff retention component designed to capture stormwater runoff for
beneficial reuse, such as irrigation.
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(e)
|
Designed with a slope of less than 2%.
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(f)
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Designed with a slope of equal to or greater than 2%.
|
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(g)
|
Manufactured treatment devices that meet the definition of green infrastructure at § 335-2.
|
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(h)
|
Manufactured treatment devices that do not meet the definition of green infrastructure at § 335-2.
|
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(i)
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The top elevation of the impermeable layer or liner must maintain
this two-foot minimum separation to the seasonal high-water table.
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F.
An alternative stormwater management measure, alternative removal rate, and/or alternative method to calculate the removal rate may be used if the design engineer demonstrates the capability of the proposed alternative stormwater management measure and/or the validity of the alternative rate or method to the municipality. A copy of any approved alternative stormwater management measure, alternative removal rate, and/or alternative method to calculate the removal rate shall be provided to the NJDEP and the Pinelands Commission in accordance with § 335-5B. Alternative stormwater management measures may be used to satisfy the requirements at § 335-3N only if the measures meet the definition of green infrastructure at § 335-2. Alternative stormwater management measures that function in a similar manner to a BMP listed at § 335-3N(2) are subject to the contributory drainage area limitation specified at § 335-3N(2) for that similarly functioning BMP. Alternative stormwater management measures approved in accordance with this subsection that do not function in a similar manner to any BMP listed at § 335-3N(2) shall have a contributory drainage area less than or equal to 2.5 acres, except for alternative stormwater management measures that function similarly to cisterns, grass swales, green roofs, standard constructed wetlands, vegetative filter strips, and wet ponds, which are not subject to a contributory drainage area limitation. Alternative measures that function similarly to standard constructed wetlands or wet ponds shall not be used for compliance with the stormwater runoff quality standard unless a variance in accordance with § 335-10 is granted from § 335-3N.
G.
Hydraulic impacts.
(1)
For all major development, groundwater mounding analysis shall be
required for purposes of assessing the hydraulic impacts of mounding
of the water table resulting from infiltration of stormwater runoff
from the maximum storm designed for infiltration. The mounding analysis
shall provide details and supporting documentation on the methodology
used. Groundwater mounds shall not cause stormwater or groundwater
to breakout to the land surface or cause adverse impacts to adjacent
water bodies, wetlands, or subsurface structures, including, but not
limited to, basements and septic systems. Where the mounding analysis
identifies adverse impacts, the stormwater management measure shall
be redesigned or relocated, as appropriate.
(2)
For all applicable minor development, a design engineer's certification
that each green infrastructure stormwater management measure will
not adversely impact basements or septic systems of the proposed development
shall be required.
H.
Design standards for stormwater management measures are as follows:
(1)
Stormwater management measures shall be designed to take into account
the existing site conditions, including, but not limited to, environmentally
critical areas; wetlands; wetland transition areas; flood-prone areas;
slopes; depth to seasonal high-water table; soil type, permeability,
and texture; drainage area and drainage patterns; and the presence
of solution-prone carbonate rocks (limestone);
(2)
Stormwater management measures designed to infiltrate stormwater
shall be designed, constructed, and maintained to provide a minimum
separation of at least two feet between the elevation of the lowest
point of infiltration and the seasonal high water table;
(3)
Stormwater management measures designed to infiltrate stormwater
shall be sited in suitable soils verified by testing to have permeability
rates between one and 20 inches per hour. A factor of safety of two
shall be applied to the soil's permeability rate in determining
the infiltration measure's design permeability rate. If such
soils do not exist on the parcel proposed for development or if it
is demonstrated that it is not practical for engineering, environmental,
or safety reasons to site the stormwater infiltration measure(s) in
such soils, the stormwater infiltration measure(s) may be sited in
soils verified by testing to have permeability rates in excess of
20 inches per hour, provided that stormwater is routed through a bioretention
system prior to infiltration. Said bioretention system shall be designed,
installed, and maintained in accordance with the New Jersey Stormwater
BMP Manual;
(4)
The use of stormwater management measures that are smaller in size
and distributed spatially throughout a parcel, rather than the use
of a single, larger stormwater management measure shall be required;
(5)
Methods of treating stormwater prior to entering any stormwater management
measure shall be incorporated into the design of the stormwater management
measure to the maximum extent practical;
(6)
To avoid sedimentation that may result in clogging and reduction
of infiltration capability and to maintain maximum soil infiltration
capacity, the construction of stormwater management measures that
rely upon infiltration shall be managed in accordance with the following
standards:
(a)
No stormwater management measure shall be placed into operation
until its drainage area has been completely stabilized. Instead, upstream
runoff shall be diverted around the measure and into separate, temporary
stormwater management facilities and sediment basins. Such temporary
facilities and basins shall be installed and utilized for stormwater
management and sediment control until stabilization is achieved in
accordance with N.J.A.C. 2:90;
(b)
If, for engineering, environmental, or safety reasons, temporary stormwater management facilities and sediment basins cannot be constructed on the parcel in accordance with Subsection H(6)(a) above, the stormwater management measure may be placed into operation prior to the complete stabilization of its drainage area provided that the measure's bottom during this period is constructed at a depth at least two feet higher than its final design elevation. When the drainage area has been completely stabilized, all accumulated sediment shall be removed from the stormwater management measure, which shall then be excavated to its final design elevation; and
(c)
To avoid compacting the soils below a stormwater management
measure designed to infiltrate stormwater, no heavy equipment, such
as backhoes, dump trucks, or bulldozers shall be permitted to operate
within the footprint of the stormwater management measure. All excavation
required to construct a stormwater management measure that relies
on infiltration shall be performed by equipment placed outside the
footprint of the stormwater management measure. If this is not possible,
the soils within the excavated area shall be renovated and tilled
after construction is completed. Earthwork associated with stormwater
management measure construction, including excavation, grading, cutting,
or filling, shall not be performed when soil moisture content is above
the lower plastic limit;
(7)
Dry wells shall be designed to prevent access by amphibian and reptiles;
(8)
Stormwater management measures shall be designed to minimize maintenance, facilitate maintenance and repairs, and ensure proper functioning. Trash racks shall be installed at the intake to the outlet structure, as appropriate, and shall have parallel bars with one-inch spacing between the bars to the elevation of the water quality design storm established at § 335-3P(4). For elevations higher than the water quality design storm, the parallel bars at the outlet structure shall be spaced no greater than one-third the width of the diameter of the orifice or one-third the width of the weir, with a minimum spacing between bars of one inch and a maximum spacing between bars of six inches. In addition, the design of trash racks must comply with the requirements of § 335-7C(1);
(9)
Stormwater management measures shall be designed, constructed, and
installed to be strong, durable, and corrosion resistant. Measures
that are consistent with the relevant portions of the Residential
Site Improvement Standards at N.J.A.C. 5:21-7.3, 7.4, and 7.5 shall
be deemed to meet this requirement;
(10)
Stormwater management BMPs shall be designed to meet the minimum safety standards for stormwater management BMPs at § 335-7; and
(11)
The size of the orifice at the intake to the outlet from the
stormwater management BMP shall be a minimum of 2 1/2 inches
in diameter.
I.
Manufactured treatment devices may be used to meet the requirements of this Article, provided the pollutant removal rates are verified by the New Jersey Corporation for Advanced Technology and certified by the NJDEP. Manufactured treatment devices that do not meet the definition of green infrastructure at § 335-2 may be used only under the circumstances described at § 335-3N(4).
J.
Any application for a new agricultural development that meets the definition of major development at N.J.A.C. 7:8-1.2 shall be submitted to the Soil Conservation District for review and approval in accordance with the requirements at § 335-3N, O, P, and Q and any applicable Soil Conservation District guidelines for stormwater runoff quantity and erosion control. For purposes of this subsection, "agricultural development" means land uses normally associated with the production of food, fiber, and livestock for sale. Such uses do not include the development of land for the processing or sale of food and the manufacture of agriculturally related products.
K.
If there is more than one drainage area, the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 335-3O, P, and Q shall be met in each drainage area, unless the runoff from the drainage areas converge onsite and no adverse environmental impact would occur as a result of compliance with any one or more of the individual standards being determined utilizing a weighted average of the results achieved for that individual standard across the affected drainage areas.
L.
Any stormwater management measure authorized under the municipal stormwater management plan or this Article shall be reflected in a deed notice recorded in the Gloucester County Clerk's Office. A form of deed notice shall be submitted to the municipality for approval prior to filing. The deed notice shall contain a description of the stormwater management measure(s) used to meet the green infrastructure, groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 335-3N, O, P, and Q and shall identify the location of the stormwater management measure(s) in NAD 1983 State Plane New Jersey FIPS 2900 US Feet or Latitude and Longitude in decimal degrees. The deed notice shall also reference the maintenance plan required to be recorded upon the deed pursuant to § 335-9B(5). Prior to the commencement of construction, proof that the above required deed notice has been filed shall be submitted to the municipality. Proof that the required information has been recorded on the deed shall be in the form of either a copy of the complete recorded document or a receipt from the clerk or other proof of recordation provided by the recording office. However, if the initial proof provided to the municipality is not a copy of the complete recorded document, a copy of the complete recorded document shall be provided to the municipality within 180 calendar days of the authorization granted by the municipality.
M.
A stormwater management measure approved under the municipal stormwater management plan or this article may be altered or replaced with the approval of the municipality, if the municipality determines that the proposed alteration or replacement meets the design and performance standards contained in § 335-3N, O, P, and Q and provides the same level of stormwater management as the previously approved stormwater management measure that is being altered or replaced. If an alteration or replacement is approved, a revised deed notice shall be submitted to the municipality for approval and subsequently recorded with the Gloucester County Clerk's Office and shall contain a description and location of the stormwater management measure, as well as reference to the maintenance plan, in accordance with Subsection L above. Prior to the commencement of construction, proof that the above required deed notice has been filed shall be submitted to the municipality in accordance with Subsection L above.
N.
Green infrastructure standards.
(1)
This subsection specifies the types of green infrastructure BMPs
that may be used to satisfy the groundwater recharge, stormwater runoff
quality, and stormwater runoff quantity standards of this article.
(2)
To satisfy the groundwater recharge and stormwater runoff quality standards at § 335-3O and P, the design engineer shall utilize BMPs identified in Table 1 at § 335-3E and/or an alternative stormwater management measure approved in accordance with § 335-3F. The following green infrastructure BMPs are subject to the following maximum contributory drainage area limitations:
|
Best Management Practice
|
Maximum Contributory Drainage Area
|
|---|---|
|
Dry well
|
1 acre
|
|
Manufactured treatment device
|
2.5 acres
|
|
Pervious pavement system
|
Area of additional inflow cannot exceed three times the area
occupied by the BMP
|
|
Small-scale bioretention systems
|
2.5 acres
|
|
Small-scale infiltration basin
|
2.5 acres
|
|
Small-scale sand filter
|
2.5 acres
|
(4)
If a variance in accordance with § 335-10 is granted from the requirements of this subsection, then BMPs from Table 1, 2, or 3 at § 335-3E and/or an alternative stormwater management measure approved in accordance with § 335-3F may be used to meet the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 335-3O, P, and Q.
(5)
For separate or combined storm sewer improvement projects, such as sewer separation, undertaken by a government agency or public utility (for example, a sewerage company), the requirements of this subsection shall only apply to areas owned in fee simple by the government agency or utility, and areas within a right-of-way or easement held or controlled by the government agency or utility; the entity shall not be required to obtain additional property or property rights to fully satisfy the requirements of this subsection. Regardless of the amount of area of a separate or combined storm sewer improvement project subject to the green infrastructure requirements of this subsection, each project shall fully comply with the applicable groundwater recharge, stormwater runoff quality control, and stormwater runoff quantity standards at § 335-3O, P, and Q.
O.
Groundwater recharge standards.
(1)
This subsection contains the minimum design and performance standards
for groundwater recharge as follows:
(2)
For all major development, the total runoff volume generated from
the net increase in impervious surfaces by a ten-year, twenty-four-hour
storm shall be retained and infiltrated onsite.
(3)
For minor development that involves the construction of four or fewer
dwelling units, the runoff generated from the total roof area of the
dwelling(s) by a ten-year, twenty-four-hour storm shall be retained
and infiltrated through installation of one or more green infrastructure
stormwater management measures designed in accordance with the New
Jersey Stormwater BMP Manual. Appropriate green infrastructure stormwater
management measures include, but are not limited to dry wells, pervious
pavement systems, and small scale bioretention systems, including
rain gardens.
(4)
For minor development that involves any nonresidential use and will
result in an increase of greater than 1,000 square feet of regulated
motor vehicle surfaces, the water quality design storm volume generated
from these surfaces shall be recharged onsite.
P.
Stormwater runoff quality standards.
(1)
This subsection contains the minimum design and performance standards
to control stormwater runoff quality impacts of:
(a)
Major development;
(b)
Minor development that involves any nonresidential use and will
result in an increase of greater than 1,000 square feet of regulated
motor vehicle surfaces; and
(c)
Any development involving the grading, clearing, or disturbance
of an area in excess of 5,000 square feet within any five-year period.
(2)
Stormwater management measures shall be designed to reduce the post-construction load of total suspended solids (TSS) in stormwater runoff generated from the water quality design storm established at § 335-3P(4) as follows:
(a)
Eighty percent TSS removal of the anticipated load, expressed
as an annual average shall be achieved for the stormwater runoff from
the net increase of motor vehicle surface.
(b)
If the surface is considered regulated motor vehicle surface
because the water quality treatment for an area of motor vehicle surface
that is currently receiving water quality treatment either by vegetation
or soil, by an existing stormwater management measure, or by treatment
at a wastewater treatment plant is to be modified or removed, the
project shall maintain or increase the existing TSS removal of the
anticipated load expressed as an annual average.
(3)
The requirement to reduce TSS does not apply to any stormwater runoff in a discharge regulated under a numeric effluent limitation for TSS imposed under the New Jersey Pollutant Discharge Elimination System (NJPDES) rules, N.J.A.C. 7:14A, or in a discharge specifically exempt under a NJPDES permit from this requirement. Every major development, including any that discharge into a combined sewer system, shall comply with Subsection P(2) above, unless the major development is itself subject to a NJPDES permit with a numeric effluent limitation for TSS or the NJPDES permit to which the major development is subject exempts the development from a numeric effluent limitation for TSS.
(4)
The water quality design storm is 1.25 inches of rainfall in two
hours. Water quality calculations shall take into account the distribution
of rain from the water quality design storm, as reflected in Table
4, below. The calculation of the volume of runoff may take into account
the implementation of stormwater management measures.
|
Table 4
Water Quality Design Storm Distribution
| |||||
|---|---|---|---|---|---|
|
Time
(Minutes)
|
Cumulative Rainfall
(Inches)
|
Time
(Minutes)
|
Cumulative Rainfall
(Inches)
|
Time
(Minutes)
|
Cumulative Rainfall
(Inches)
|
|
1
|
0.00166
|
41
|
0.1728
|
81
|
1.0906
|
|
2
|
0.00332
|
42
|
0.1796
|
82
|
1.0972
|
|
3
|
0.00498
|
43
|
0.1864
|
83
|
1.1038
|
|
4
|
0.00664
|
44
|
0.1932
|
84
|
1.1104
|
|
5
|
0.0083
|
45
|
0.2
|
85
|
1.117
|
|
6
|
0.00996
|
46
|
0.2117
|
86
|
1.1236
|
|
7
|
0.01162
|
47
|
0.2233
|
87
|
1.1302
|
|
8
|
0.01328
|
48
|
0.235
|
88
|
1.1368
|
|
9
|
0.01494
|
49
|
0.2466
|
89
|
1.1434
|
|
10
|
0.0166
|
50
|
0.2583
|
90
|
1.15
|
|
11
|
0.01828
|
51
|
0.2783
|
91
|
1.155
|
|
12
|
0.01996
|
52
|
0.2983
|
92
|
1.16
|
|
13
|
0.02164
|
53
|
0.3183
|
93
|
1.165
|
|
14
|
0.02332
|
54
|
0.3383
|
94
|
1.17
|
|
15
|
0.025
|
55
|
0.3583
|
95
|
1.175
|
|
16
|
0.03
|
56
|
0.4116
|
96
|
1.18
|
|
17
|
0.035
|
57
|
0.465
|
97
|
1.185
|
|
18
|
0.04
|
58
|
0.5183
|
98
|
1.19
|
|
19
|
0.045
|
59
|
0.5717
|
99
|
1.195
|
|
20
|
0.05
|
60
|
0.625
|
100
|
1.2
|
|
21
|
0.055
|
61
|
0.6783
|
101
|
1.205
|
|
22
|
0.06
|
62
|
0.7317
|
102
|
1.21
|
|
23
|
0.065
|
63
|
0.785
|
103
|
1.215
|
|
24
|
0.07
|
64
|
0.8384
|
104
|
1.22
|
|
25
|
0.075
|
65
|
0.8917
|
105
|
1.225
|
|
26
|
0.08
|
66
|
0.9117
|
106
|
1.2267
|
|
27
|
0.085
|
67
|
0.9317
|
107
|
1.2284
|
|
28
|
0.09
|
68
|
0.9517
|
108
|
1.23
|
|
29
|
0.095
|
69
|
0.9717
|
109
|
1.2317
|
|
30
|
0.1
|
70
|
0.9917
|
110
|
1.2334
|
|
31
|
0.1066
|
71
|
1.0034
|
111
|
1.2351
|
|
32
|
0.1132
|
72
|
1.015
|
112
|
1.2367
|
|
33
|
0.1198
|
73
|
1.0267
|
113
|
1.2384
|
|
34
|
0.1264
|
74
|
1.0383
|
114
|
1.24
|
|
35
|
0.133
|
75
|
1.05
|
115
|
1.2417
|
|
36
|
0.1396
|
76
|
1.0568
|
116
|
1.2434
|
|
37
|
0.1462
|
77
|
1.0636
|
117
|
1.245
|
|
38
|
0.1528
|
78
|
1.0704
|
118
|
1.2467
|
|
39
|
0.1594
|
79
|
1.0772
|
119
|
1.2483
|
|
40
|
0.166
|
80
|
1.084
|
120
|
1.25
|
(5)
If more than one BMP in series is necessary to achieve the required
80% TSS reduction for a site, the applicant shall utilize the following
formula to calculate TSS reduction:
|
R = A + B - (A x B)/100
| ||
|
Where:
| ||
|
R
|
=
|
total TSS percent load removal from application of both BMPs.
|
|
A
|
=
|
the TSS percent removal rate applicable to the first BMP.
|
|
B
|
=
|
the TSS percent removal rate applicable to the second BMP.
|
(6)
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 established at § 335-3P(4). In achieving reduction of nutrients to the maximum extent feasible, the design of the site shall include green infrastructure BMPs that optimize nutrient removal while still achieving the performance standards in § 335-3O, P, and Q.
(7)
For all major development, stormwater management measures shall be designed to achieve a minimum of 65% reduction of the post-construction total nitrogen load from the developed site, including those permanent lawn or turf areas that are specifically intended for active human use as described at N.J.A.C. 7:50-6.24(c)3, in stormwater runoff generated from the water quality design storm established at § 335-3P(4). In achieving a minimum 65% reduction of total nitrogen, the design of the site shall include green infrastructure in accordance with the New Jersey Stormwater BMP Manual and shall optimize nutrient removal. The minimum 65% total nitrogen reduction may be achieved by using a singular stormwater management measure or multiple stormwater management measures in series.
(8)
In high pollutant loading areas (HPLAs) and/or areas where stormwater runoff is exposed to source material, as defined in § 335-2, the following additional water quality standards shall apply:
(a)
The areal extent and amount of precipitation falling directly
on or flowing over HPLAs and/or areas where stormwater is exposed
to source material shall be minimized through the use of roof covers,
canopies, curbing or other physical means to the maximum extent practical
in order to minimize the quantity of stormwater generated from HPLA
areas and areas where stormwater runoff is exposed to source material;
(b)
The stormwater runoff originating from HPLAs and/or areas where stormwater runoff is exposed to source material shall be segregated and prohibited from co-mingling with stormwater runoff originating from the remainder of the parcel unless it is first routed through one or more stormwater management measures required at Subsection P(8)(c) below;
(c)
The stormwater runoff from HPLAs and/or areas where stormwater runoff is exposed to source material shall incorporate stormwater management measures designed to reduce the post-construction load of TSS by at least 90% in stormwater runoff generated from the water quality design storm established at § 335-3P(4) using one or more of the measures identified at Subsection P(8)(c)[1] or [2] below. In meeting this requirement, the minimum 90% removal of total suspended solids may be achieved by utilizing multiple stormwater management measures in series:
[1]
Any measure designed in accordance with the New Jersey Stormwater
BMP Manual to remove total suspended solids. Any such measure must
be constructed to ensure that the lowest point of infiltration within
the measure maintains a minimum of two feet of vertical separation
from the seasonal high-water table; and
[2]
Other measures certified by the NJDEP, including a media filtration
system manufactured treatment device with a minimum 80% removal of
total suspended solids as verified by the New Jersey Corporation for
Advanced Technology; and
(d)
If the potential for contamination of stormwater runoff by petroleum products exists onsite, prior to being conveyed to the stormwater management measure required at Subsection P(8)(c) above, the stormwater runoff from the HPLAs and areas where stormwater runoff is exposed to source material shall be conveyed through an oil/grease separator or other equivalent manufactured filtering device providing for the removal of petroleum hydrocarbons. The applicant shall provide the review agency with sufficient data to demonstrate acceptable performance of the device.
(9)
The Flood Hazard Area Control Act Rules at N.J.A.C. 7:13-4.1(c) 1
establish 300-foot riparian zones along Category One waters, as designated
in the Surface Water Quality Standards at N.J.A.C. 7:9B, and certain
upstream tributaries to Category One waters. A person shall not undertake
a major development that is located within or discharges into a 300-foot
riparian zone without prior authorization from the Department under
N.J.A.C. 7:13.
(10)
Pursuant to the Flood Hazard Area Control Act Rules at N.J.A.C.
7:13-11.2(j)3.i, runoff from the water quality design storm that is
discharged within a 300-foot riparian zone shall be treated in accordance
with this subsection to reduce the post-construction load of total
suspended solids by 95% of the anticipated load from the developed
site, expressed as an annual average.
Q.
Stormwater runoff quantity standards.
(1)
This subsection contains the minimum design and performance standards
to control stormwater runoff quantity impacts related to applicable
major and minor development.
(2)
In order to control stormwater runoff quantity impacts, the design engineer shall, using the assumptions and factors for stormwater runoff calculations at § 335-4, complete one of the following:
(a)
Demonstrate through hydrologic and hydraulic analysis that for
stormwater leaving the site, post-construction runoff hydrographs
for the two-, ten-, and 100-year storm events do not exceed, at any
point in time, the pre-construction runoff hydrographs for the same
storm events;
(b)
Demonstrate through hydrologic and hydraulic analysis that there
is no increase, as compared to the pre-construction condition, in
the peak runoff rates of stormwater leaving the site for the two-,
ten- and 100-year storm events and that the increased volume or change
in timing of stormwater runoff will not increase flood damage at or
downstream of the site. This analysis shall include the analysis of
impacts of existing land uses and projected land uses assuming full
development under existing zoning and land use ordinances in the drainage
area;
(c)
Design stormwater management measures so that the post-construction
peak runoff rates for the two-, ten- and 100-year storm events are
50%, 75% and 80%, respectively, of the pre-construction peak runoff
rates. The percentages apply only to the post-construction stormwater
runoff that is attributable to the portion of the site on which the
proposed development or project is to be constructed; or
(d)
In tidal flood hazard areas, stormwater runoff quantity analysis in accordance with Subsection Q(2)(a), (b), and (c) above is required unless the design engineer demonstrates through hydrologic and hydraulic analysis that the increased volume, change in timing, or increased rate of the stormwater runoff, or any combination of the three will not result in additional flood damage below the point of discharge of the major development. No analysis is required if the stormwater is discharged directly into any ocean, bay, inlet, or the reach of any watercourse between its confluence with an ocean, bay, or inlet and downstream of the first water control structure.
(3)
The stormwater runoff quantity standards shall be applied at the
site's boundary to each abutting lot, roadway, watercourse, or
receiving storm sewer system.
(4)
There shall be no direct discharge of stormwater runoff from any
point or nonpoint source to any wetland, wetlands transition area,
or surface water body. In addition, stormwater runoff shall not be
directed in such a way as to increase the volume and rate of discharge
into any wetlands, wetlands transition area, or surface water body
from that which existed prior to development of the parcel.
(5)
To the maximum extent practical, there shall be no direct discharge
of stormwater runoff onto farm fields to protect farm crops from damage
due to flooding, erosion, and long-term saturation of cultivated crops
and cropland.
R.
As-built requirements for major development are as follows:
(1)
After all construction activities have been completed on the parcel
and finished grade has been established in each stormwater management
measure designed to infiltrate stormwater, replicate post-development
permeability tests shall be conducted to determine if as-built soil
permeability rates are consistent with design permeability rates.
The results of such tests shall be submitted to the municipal engineer
or other appropriate reviewing engineer. If the results of the post-
development permeability tests fail to achieve the minimum required
design permeability rate, utilizing a factor of safety of two, the
stormwater management measure shall be renovated and re-tested until
the required permeability rates are achieved; and
(2)
After all construction activities and required testing have been
completed on the parcel, as-built plans, including as-built elevations
of all stormwater management measures shall be submitted to the municipal
engineer or other appropriate reviewing engineer to serve as a document
of record. Based upon that engineer's review of the as-built
plans, all corrections or remedial actions deemed necessary due to
the failure to comply with design standards and/or for any reason
concerning public health or safety, shall be completed by the applicant.
In lieu of review by the municipal engineer, the municipality may
engage a licensed professional engineer to review the as-built plans
and charge the applicant for all costs associated with such review.
A.
Stormwater runoff shall be calculated by the design engineer using the USDA Natural Resources Conservation Service (NRCS) methodology, including the NRCS Runoff Equation and Dimensionless Unit Hydrograph, as described in Chapters 7, 9, 10, 15 and 16 Part 630, Hydrology National Engineering Handbook, incorporated herein by reference as amended and supplemented, except that the Rational Method for peak flow and the Modified Rational Method for hydrograph computations shall not be used. This methodology is additionally described in Technical Release 55 - Urban Hydrology for Small Watersheds (TR-55), dated June 1986, incorporated herein by reference as amended and supplemented. Information regarding the methodology is available from the Natural Resources Conservation Service website at: https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1044171.pdf, or at United States Department of Agriculture Natural Resources Conservation Service, 220 Davison Avenue, Somerset, New Jersey 08873.
B.
In calculating stormwater runoff using the NRCS methodology, the
appropriate twenty-four-hour rainfall depths as developed for the
parcel by the National Oceanic and Atmospheric Administration, https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=nj,
shall be utilized.
C.
For the purpose of calculating runoff coefficients and groundwater
recharge, there is a presumption that the pre-construction condition
of a site or portion thereof is a wooded land use with good hydrologic
condition. A runoff coefficient or a groundwater recharge land cover
for an existing condition may be used on all or a portion of the site
if the design engineer verifies that the hydrologic condition has
existed on the site or portion of the site for at least five years
without interruption prior to the time of application. If more than
one land cover has existed on the site during the five years immediately
prior to the time of application, the land cover with the lowest runoff
potential shall be used for the computations. In addition, there is
the presumption that the site is in good hydrologic condition (if
the land use type is pasture, lawn, or park), with good cover (if
the land use type is woods), or with good hydrologic condition and
conservation treatment (if the land use type is cultivation).
D.
In computing pre-construction stormwater runoff, the design engineer
shall account for all significant land features and structures, such
as ponds, wetlands, depressions, hedgerows, or culverts, that may
reduce pre-construction stormwater runoff rates and volumes.
E.
In computing stormwater runoff from all design storms, the design
engineer shall consider the relative stormwater runoff rates and/or
volumes of pervious and impervious surfaces separately to accurately
compute the rates and volume of stormwater runoff from the site. To
calculate runoff from unconnected impervious cover, urban impervious
area modifications as described in the NRCS Technical Release 55 -
Urban Hydrology for Small Watersheds or other methods may be employed.
F.
If the invert of the outlet structure of a stormwater management
measure is below the flood hazard design flood elevation as defined
at N.J.A.C. 7:13, the design engineer shall take into account the
effects of tailwater in the design of structural stormwater management
measures.
G.
Groundwater recharge may be calculated in accordance with the New
Jersey Geological Survey Report GSR-32, A Method for Evaluating Groundwater-Recharge
Areas in New Jersey, incorporated herein by reference as amended and
supplemented. Information regarding the methodology is available from
the New Jersey Stormwater Best Management Practices Manual; at the
New Jersey Geological Survey website at: https://www.nj.gov/dep/njgs/pricelst/gsreport/gsr32.pdf
or at New Jersey Geological and Water Survey, 29 Arctic Parkway, PO
Box 420 Mail Code 29-01, Trenton, New Jersey 08625-0420.
A.
Technical guidance for stormwater management measures can be found
in the documents listed below, which are available to download from
the NJDEP's website at: http://www.nj.gov/dep/stormwater/bmp_manual2.htm.
(1)
Guidelines for stormwater management measures are contained in the New Jersey Stormwater BMP 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 of § 335-3E. The New Jersey Stormwater BMP Manual may be utilized as a guide in determining the extent to which stormwater management activities and measures meet the standards of this article.
(2)
Additional maintenance guidance is available on the NJDEP's
website at: https://www.njstormwater.org/maintenance_guidance.htm.
B.
(1)
Submissions required for review by the NJDEP should be mailed to:
The Division of Water Quality, New Jersey Department of Environmental
Protection, Mail Code 401-02B, PO Box 420, Trenton, New Jersey 08625-0420.
(2)
Submissions required for review by the Pinelands Commission should
be emailed to appinfo@pinelands.nj.gov.
A.
Site design features identified under § 335-3E, or alternative designs in accordance with § 335-3F, 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 Subsection, "solid and floatable materials" means sediment, debris, trash, and other floating, suspended, or settleable solids. For exemptions to this standard see Subsection A(2) 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:
(a)
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
(b)
A different grate, if each individual clear space in that grate
has an area of no more than seven 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.
(c)
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 square inches, or be no greater than
two inches across the smallest dimension.
(2)
The standard in Subsection A(1) above does not apply:
(a)
Where each individual clear space in the curb opening in existing
curb-opening inlet does not have an area of more than nine square
inches;
(b)
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;
(c)
Where flows from the water quality design storm established at § 335-3P(4) 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 4.625 inches long and 1.5 inches wide (this
option does not apply for outfall netting facilities); or
[2]
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].
(d)
Where flows are conveyed through a trash rack that has parallel bars with one-inch spacing between the bars, to the elevation of the Water Quality Design Storm established at § 335-3P(4); or
(e)
Where the NJDEP 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.
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 Subsection C(1), (2) or (3) below 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:
(a)
The trash rack shall have parallel bars, with no greater than
six-inch spacing between the bars;
(b)
The trash rack shall be designed so as not to adversely affect
the hydraulic performance of the outlet pipe or structure;
(c)
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
(d)
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, the grate
shall comply with the following requirements:
(a)
The overflow grate shall be secured to the outlet structure
but removable for emergencies and maintenance.
(b)
The overflow grate spacing shall be no greater than two inches
across the smallest dimension.
(c)
The overflow grate shall be constructed of rigid, durable, and
corrosion resistant material, 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:
(a)
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 the prior approval of the municipality pursuant to Subsection D below, a freestanding outlet structure may be exempted from this requirement;
(b)
Safety ledges shall be constructed on the slopes of all new stormwater management BMPs having a permanent pool of water deeper than 2 1/2 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 2 1/2 feet below the permanent water surface, and the second step shall be located one to 1 1/2 feet above the permanent water surface. See Subsection E below for an illustration of safety ledges in a stormwater management BMP; and
(c)
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.
|
Figure 1. Elevation View - Basin Safety Ledge Configuration
 |
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 § 335-8C.
(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 § 335-8D.
(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 § 335-3P(4). The standards for groundwater recharge and stormwater runoff rate, volume and quality required by § 335-3O, P, and Q and shall be met using the methods, calculations and assumptions provided in § 335-4.
(6)
The applicant shall submit three 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 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
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. Franklin Township
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 on-site 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:
(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.
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.
E.
Exception from submission requirements. With the exception of Subsections 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.
B.
The maintenance plan shall include the following:
(1)
Specific preventative maintenance tasks and schedules; cost estimates,
including estimated cost of sediment, debris, or trash removal; and
the name, address, and telephone number of the person or persons responsible
for preventative and corrective maintenance (including replacement).
The plan shall contain information on BMP location, design, ownership,
maintenance tasks and frequencies, and other details as specified
in Chapter 8 of the NJ BMP Manual, as well as the tasks specific to
the type of BMP, as described in the applicable chapter containing
design specifics.
(2)
Responsibility for maintenance of stormwater management measures
approved as part of an application for major development shall not
be assigned or transferred to the owner or tenant of an individual
property, unless such owner or tenant owns or leases the entire site
subject to the major development approval. The individual property
owner may be assigned incidental tasks, such as weeding of a green
infrastructure BMP, provided the individual agrees to assume these
tasks; however, the individual cannot be legally responsible for all
the maintenance required.
(3)
Responsibility for maintenance of stormwater management measures
approved as part of an application for minor development may be assigned
or transferred to the owner or tenant of the parcel.
(4)
If the maintenance plan identifies a person other than the property
owner (for example, a developer, a public agency or homeowners'
association) as having the responsibility for maintenance, the plan
shall include documentation of such person's or entity's
agreement to assume this responsibility, or of the owner's obligation
to dedicate a stormwater management facility to such person under
an applicable ordinance or regulation.
(5)
If the person responsible for maintenance identified under Subsection B(1) above is not a public agency, the maintenance plan and any future revisions based on § 335-9C(2)(b) shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan must be undertaken.
(6)
For all major development, the following additional standards apply:
(a)
The maintenance plan shall include accurate and comprehensive
drawings of all stormwater management measures on a parcel, including
the specific latitude and longitude and block/lot number of each stormwater
management measure. Maintenance plans shall specify that an inspection,
maintenance, and repair report will be updated and submitted annually
to the municipality;
(b)
Stormwater management measure easements shall be provided by
the property owner as necessary for facility inspections and maintenance
and preservation of stormwater runoff conveyance, infiltration, and
detention areas and facilities. The purpose of the easement shall
be specified in the maintenance agreement; and
(c)
An adequate means of ensuring permanent financing of the inspection,
maintenance, repair, and replacement plan shall be implemented and
shall be detailed in the maintenance plan. Financing methods shall
include, but not be limited to:
[1]
The assumption of the inspection and maintenance program by
a municipality, county, public utility, or homeowners association;
[2]
The required payment of fees to a municipal stormwater fund
in an amount equivalent to the cost of both ongoing maintenance activities
and necessary structural replacements.
(7)
For all minor development, maintenance plans shall be required for
all stormwater management measures installed in accordance with this
article and shall include, at a minimum, the following information:
C.
General maintenance and repair.
(1)
Preventative and corrective maintenance shall be performed to maintain
the function of the stormwater management measure, including, but
not limited to, 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 person responsible for maintenance identified under § 335-9B(2) shall perform all of the following requirements:
(a)
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;
(b)
Evaluate the effectiveness of the maintenance plan at least
once per year and adjust the plan and the deed as needed; and
(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 person
in writing. Upon receipt of that notice, the responsible person shall
have 14 days to effect maintenance and repair of the facility in a
manner that is approved by the municipal engineer or his designee.
The municipality, in its discretion, may extend the time allowed for
effecting maintenance and repair for good cause. If the responsible
person 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 person. Nonpayment of such
bill may result in a lien on the property.
D.
Nothing in this section shall preclude the municipality in which
the major development is located from requiring the posting of a performance
or maintenance guarantee in accordance with N.J.S.A. 40:55D-53.
A.
The exemptions, exceptions, applicability standards, and waivers
of strict compliance contained in the NJDEP Stormwater Management
Regulations at N.J.A.C. 7:8-1.1 et seq. shall not apply within the
Pinelands Area except in accordance with this section.
B.
The municipal review agency may grant a variance from the design
and performance standards for stormwater management measures set forth
in its municipal stormwater management plan and this article, provided
that:
(1)
No variances shall be granted from § 335-3Q(4), which prohibits the direct discharge of stormwater runoff to any wetlands, wetlands transition area, or surface water body and the direction of stormwater runoff in such a way as to increase in volume and rate of discharge into any wetlands, wetlands transition area, or surface water body from that which existed prior to development of the parcel;
(2)
The municipal stormwater plan includes a mitigation plan in accordance
with N.J.A.C. 7:8-4.2(c)11 and N.J.A.C. 7:50-3.39(a)2viii;
(3)
The applicant demonstrates that it is technically impracticable to
meet any one or more of the design and performance standards on-site.
For the purposes of this analysis, technical impracticability exists
only when the design and performance standard cannot be met for engineering,
environmental, or safety reasons. A municipality's approval of
a variance shall apply to an individual drainage area and design and
performance standard and shall not apply to an entire site or project,
unless an applicant provides the required analysis for each drainage
area within the site and each design and performance standard;
(4)
The applicant demonstrates that the proposed design achieves the
maximum possible compliance with the design and performance standards
of this Article on-site; and
(5)
A mitigation project is implemented, in accordance with the following:
(a)
All mitigation projects shall be located in the Pinelands Area
and in the same HUC-14 as the parcel proposed for development. If
the applicant demonstrates that no such mitigation project is available,
the municipality may approve a variance that provides for mitigation
within the same HUC-11 as the parcel proposed for development, provided
the mitigation project is located in the Pinelands Area.
(b)
The proposed mitigation project shall be consistent with the municipal stormwater management plan certified by the Pinelands Commission. If said stormwater management plan does not identify appropriate parcels or projects where mitigation may occur, the applicant may propose a mitigation project that meets the criteria in Subsection B(5)(a) above.
(c)
The mitigation project shall be approved no later than preliminary
or final site plan approval of the major development.
(d)
The mitigation project shall be constructed prior to, or concurrently
with, the development receiving the variance.
(f)
If the variance that resulted in the mitigation project being required is from the green infrastructure standards at § 335-3N, then the mitigation project must use green infrastructure BMPs in Table 1 contained at § 335-3E, and/or an alternative stormwater management measure approved in accordance with § 335-3F that meets the definition of green infrastructure to manage an equivalent or greater area of impervious surface and an equivalent or greater area of motor vehicle surface as the area of the major development subject to the variance. Grass swales and vegetative filter strips may only be used in the mitigation project if the proposed project additionally includes a green infrastructure BMP other than a grass swale or vegetative filter strip. The green infrastructure used in the mitigation project must be sized to manage the water quality design storm established at § 335-3P(4), at a minimum, and is subject to the applicable contributory drainage area limitation specified at § 335-3N(2), as applicable.
(h)
A variance from the stormwater runoff quality standards at § 335-3P may be granted if the following are met:
[1]
The total drainage area of motor vehicle surface managed by
the mitigation project(s) must equal or exceed the drainage area of
the area of the major development subject to the variance and must
provide sufficient TSS removal to equal or exceed the deficit resulting
from granting the variance for the major development; and
(i)
A variance from the stormwater runoff quantity standards at § 335-3Q may be granted if the following are met:
[1]
The applicant demonstrates, through hydrologic and hydraulic
analysis, including the effects of the mitigation project, that the
variance will not result in increased flooding damage below each point
of discharge of the major development;
[2]
The mitigation project indirectly discharges to the same watercourse
and is located upstream of the major development subject to the variance;
and
[3]
The mitigation project provides peak flow rate attenuation in accordance with § 335-3Q(2)(c) for an equivalent or greater area than the area of the major development subject to the variance. For the purposes of this demonstration, equivalent includes both size of the area and percentage of impervious surface and/or motor vehicle surface.
(j)
The applicant or the entity assuming maintenance responsibility for the associated major development shall be responsible for preventive and corrective maintenance (including replacement) of the mitigation project and shall be identified as such in the maintenance plan established in accordance with § 335-9. This responsibility is not transferable to any entity other than a public agency, in which case a written agreement with that public agency must be submitted to the review agency.
C.
Any approved variance shall be submitted by the municipal review
agency to the county review agency and the NJDEP, by way of a written
report describing the variance, as well as the required mitigation,
within 30 days of the approval.
A.
Any person(s) who erects, constructs, alters, repairs, converts,
maintains, or uses any building, structure or land in violation of
this article shall be subject to the following penalties:
B.
A fine not to exceed $1,000 per day for every day that the provisions
of this ordinance are violated. Each day that the provisions of this
article are violated shall be deemed a separate offense. All violations
of this article shall be prosecuted in the Municipal Court of the
Township of Franklin or any other tribunal with subject matter jurisdiction.
[Adopted 2-23-2021 by Ord. No. O-1-21]
A.
Policy statement. Flood control, groundwater recharge, and pollutant
reduction shall be achieved through the use of stormwater management
measures, including green infrastructure best management practices
(GI BMPs) and nonstructural stormwater management strategies. GI BMPs
and low-impact development (LID) should be utilized to meet the goal
of maintaining natural hydrology to reduce stormwater runoff volume,
reduce erosion, encourage infiltration and groundwater recharge, and
reduce pollution. GI BMPs and LID should be developed based upon physical
site conditions and the origin, nature and the anticipated quantity,
or amount, of potential pollutants. Multiple stormwater management
BMPs may be necessary to achieve the established performance standards
for water quality, quantity, and groundwater recharge.
B.
Purpose. The purpose of this article is to establish minimum stormwater management requirements and controls for major development, as defined below in § 335-14.
C.
Applicability.
(2)
This article shall also be applicable to all major developments undertaken
by Township of Franklin.
(3)
This article shall supersede the requirements of Ordinance No. O-1-19
with the exception of projects located within the Pinelands. Refer
to Ordinance No. O-1-19 for projects located within the Pinelands.
In case of conflicts between this article, Ordinance No. O-1-19 and
the Pinelands regulations, the Pinelands regulations shall prevail
for projects located within the Pinelands only.
D.
Compatibility with other permit and ordinance requirements. Development
approvals issued pursuant to this article are to be considered an
integral part of development approvals and do not relieve the applicant
of the responsibility to secure required permits or approvals for
activities regulated by any other applicable code, rule, act, or ordinance.
In their interpretation and application, the provisions of this article
shall be held to be the minimum requirements for the promotion of
the public health, safety, and general welfare. This article is not
intended to interfere with, abrogate, or annul any other ordinances,
rule or regulation, statute, or other provision of law except that,
where any provision of this article imposes restrictions different
from those imposed by any other ordinance, rule or regulation, or
other provision of law, the more restrictive provisions or higher
standards shall control.
For the purpose of this article, the following terms, phrases,
words and their derivations shall have the meanings stated herein
unless their use in the text of this article clearly demonstrates
a different meaning. When not inconsistent with the context, words
used in the present tense include the future, words used in the plural
number include the singular number, and words used in the singular
number include the plural number. The word "shall" is always mandatory
and not merely directory. The definitions below are the same as or
based on the corresponding definitions in the Stormwater Management
Rules at N.J.A.C. 7:8-1.2.
Those areas with boundaries incorporated by reference or
revised by the Department in accordance with N.J.A.C. 7:7-13.16.
The map used by the Department to identify the location of
Coastal Planning Areas, CAFRA centers, CAFRA cores, and CAFRA nodes.
The CAFRA Planning Map is available on the Department's Geographic
Information System (GIS).
An infiltration system, sand filter designed to infiltrate,
standard constructed wetland, or wet pond, established in accordance
with N.J.A.C. 7:8-4.2(c)14, that is designed and constructed in accordance
with the New Jersey Stormwater Best Management Practices Manual, or
an alternate design, approved in accordance with N.J.A.C. 7:8-5.2(g),
for an infiltration system, sand filter designed to infiltrate, standard
constructed wetland, or wet pond and that complies with the requirements
of this article.
The increase in soil bulk density.
The area from which stormwater runoff drains to a stormwater
management measure, not including the area of the stormwater management
measure itself.
A pedestrian-oriented area of commercial and civic uses serving
the surrounding municipality, generally including housing and access
to public transportation.
An agency designated by the County Board of Commissioners
to review municipal stormwater management plans and implementing ordinance(s).
The county review agency may either be:
The Department of Environmental Protection.
A person professionally qualified and duly licensed in New
Jersey to perform engineering services that may include, but not necessarily
be limited to, development of project requirements, creation and development
of project design and preparation of drawings and specifications.
A state development and redevelopment plan center as designated
by the State Planning Commission, such as urban, regional, town, village,
or hamlet.
The division of a parcel of land into two or more parcels,
the construction, reconstruction, conversion, structural alteration,
relocation or enlargement of any building or structure, any mining
excavation or landfill, and any use or change in the use of any building
or other structure, or land or extension of use of land, for which
permission is required under the Municipal Land Use Law, N.J.S.A.
40:55D-1 et seq. In the case of development of agricultural land,
development means any activity that requires a state permit, any activity
reviewed by the County Agricultural Board (CAB) and the State Agricultural
Development Committee (SADC), and municipal review of any activity
not exempted by the Right to Farm Act, N.J.S.A. 4:1C-1 et seq.
The placement or reconstruction of impervious surface or
motor vehicle surface, or exposure and/or movement of soil or bedrock
or clearing, cutting, or removing of vegetation. Milling and repaving
is not considered disturbance for the purposes of this definition.
A geographic area within which stormwater, sediments, or
dissolved materials drain to a particular receiving water body or
to a particular point along a receiving water body.
Neighborhoods designated by the Urban Coordinating Council
"in consultation and conjunction with" the New Jersey Redevelopment
Authority pursuant to N.J.S.A. 55:19-69.
The following areas where the physical alteration of the
land is in some way restricted, either through regulation, easement,
deed restriction or ownership, such as wetlands, floodplains, threatened
and endangered species sites or designated habitats, and parks and
preserves. Habitats of endangered or threatened species are identified
using the Department's Landscape Project as approved by the Department's
Endangered and Nongame Species Program.
An area or feature which is of significant environmental
value, including, but not limited to, stream corridors, natural heritage
priority sites, habitats of endangered or threatened species, large
areas of contiguous open space or upland forest, steep slopes, and
wellhead protection and groundwater recharge areas. Habitats of endangered
or threatened species are identified using the Department's Landscape
Project as approved by the Department's Endangered and Nongame Species
Program.
The detachment and movement of soil or rock fragments by
water, wind, ice, or gravity.
A stormwater management measure that manages stormwater close
to its source by:
An area within which water drains to a particular receiving
surface water body, also known as a "subwatershed," which is identified
by a fourteen-digit hydrologic unit boundary designation, delineated
within New Jersey by the United States Geological Survey.
A surface that has been covered with a layer of material
so that it is highly resistant to infiltration by water.
The process by which water seeps into the soil from precipitation.
One or more public entities having stormwater management
planning authority designated by the regional stormwater management
planning committee pursuant to N.J.A.C. 7:8-3.2, that serves as the
primary representative of the committee.
An individual development, as well as multiple developments
that individually or collectively result in:
The disturbance of one or more acres of land since February
2, 2004;
The creation of 1/4 acre or more of regulated impervious surface
since February 2, 2004;
The creation of 1/4 acre or more of regulated motor vehicle
surface since March 2, 2021 (or the effective date of this article,
whichever is earlier); or
Major development includes all developments that are part of a common plan of development or sale (for example, phased residential development) that collectively or individually meet any one or more of Subsection A(1), (2), (3) or (4) above. Projects undertaken by any government agency that otherwise meet the definition of "major development" but which do not require approval under the Municipal Land Use Law, N.J.S.A. 40:55D-1 et seq., are also considered major development.
Land vehicles propelled other than by muscular power, such
as automobiles, motorcycles, autocycles, and low-speed vehicles. For
the purposes of this definition, motor vehicle does not include farm
equipment, snowmobiles, all-terrain vehicles, motorized wheelchairs,
go-carts, gas buggies, golf carts, ski-slope grooming machines, or
vehicles that run only on rails or tracks.
Any pervious or impervious surface that is intended to be
used by motor vehicles and/or aircraft, and is directly exposed to
precipitation, including, but not limited to, driveways, parking areas,
parking garages, roads, racetracks, and runways.
Any city, borough, town, township, or village.
The manual maintained by the Department providing, in part, design specifications, removal rates, calculation methods, and soil testing procedures approved by the Department as being capable of contributing to the achievement of the stormwater management standards specified in this article. The BMP Manual is periodically amended by the Department as necessary to provide design specifications on additional best management practices and new information on already included practices reflecting the best available current information regarding the particular practice and the Department's determination as to the ability of that best management practice to contribute to compliance with the standards contained in this article. Alternative stormwater management measures, removal rates, or calculation methods may be utilized, subject to any limitations specified in this article, provided the design engineer demonstrates to the municipality, in accordance with § 335-16F of this article and N.J.A.C. 7:8-5.2(g), that the proposed measure and its design will contribute to achievement of the design and performance standards established by this article.
An area designated by the State Planning Commission concentrating
facilities and activities which are not organized in a compact form.
A chemical element or compound, such as nitrogen or phosphorus,
which is essential to and promotes the development of organisms.
Any individual, corporation, company, partnership, firm,
association, political subdivision of this state and any state, interstate
or federal agency.
Any dredged spoil, solid waste, incinerator residue, filter
backwash, sewage, garbage, refuse, oil, grease, sewage sludge, munitions,
chemical wastes, biological materials, medical wastes, radioactive
substance [except those regulated under the Atomic Energy Act of 1954,
as amended (42 U.S.C. § 2011 et seq.)], thermal waste, wrecked
or discarded equipment, rock, sand, cellar dirt, industrial, municipal,
agricultural, and construction waste or runoff, or other residue discharged
directly or indirectly to the land, groundwaters or surface waters
of the state, or to a domestic treatment works. "Pollutant" includes
both hazardous and nonhazardous pollutants.
The amount of water from precipitation that infiltrates into
the ground and is not evapotranspired.
Any of the following, alone or in combination:
A net increase of impervious surface;
The total area of impervious surface collected by a new stormwater
conveyance system (for the purpose of this definition, a "new stormwater
conveyance system" is a stormwater conveyance system that is constructed
where one did not exist immediately prior to its construction or an
existing system for which a new discharge location is created);
The total area of impervious surface proposed to be newly collected
by an existing stormwater conveyance system; and/or
The total area of impervious surface collected by an existing
stormwater conveyance system where the capacity of that conveyance
system is increased.
Any of the following, alone or in combination:
The total area of motor vehicle surface that is currently receiving
water;
A net increase in motor vehicle surface; and/or
Quality treatment either by vegetation or soil, by an existing
stormwater management measure, or by treatment at a wastewater treatment
plant, where the water quality treatment will be modified or removed.
Solid material, mineral or organic, that is in suspension,
is being transported, or has been moved from its site of origin by
air, water or gravity as a product of erosion.
The lot or lots upon which a major development is to occur
or has occurred.
All unconsolidated mineral and organic material of any origin.
An area delineated on the State Plan Policy Map and adopted
by the State Planning Commission that is intended to be the focus
for much of the state's future redevelopment and revitalization efforts.
The geographic application of the State Development and Redevelopment
Plan's goals and statewide policies, and the official map of these
goals and policies.
Water resulting from precipitation (including rain and snow)
that runs off the land's surface, is transmitted to the subsurface,
or is captured by separate storm sewers or other sewage or drainage
facilities, or conveyed by snow removal equipment.
An excavation or embankment and related areas designed to
retain stormwater runoff. A stormwater management BMP may either be
normally dry (that is, a detention basin or infiltration system),
retain water in a permanent pool (a retention basin), or be planted
mainly with wetland vegetation (most constructed stormwater wetlands).
Any practice, technology, process, program, or other method
intended to control or reduce stormwater runoff and associated pollutants,
or to induce or control the infiltration or groundwater recharge of
stormwater or to eliminate illicit or illegal nonstormwater discharges
into stormwater conveyances.
A public body authorized by legislation to prepare stormwater
management plans.
The geographic area for which a stormwater management planning
agency is authorized to prepare stormwater management plans, or a
specific portion of that area identified in a stormwater management
plan prepared by that agency.
Water flow on the surface of the ground or in storm sewers,
resulting from precipitation.
A flood hazard area in which the flood elevation resulting
from the two-, ten-, or 100-year storm, as applicable, is governed
by tidal flooding from the Atlantic Ocean. Flooding in a tidal flood
hazard area may be contributed to, or influenced by, stormwater runoff
from inland areas, but the depth of flooding generated by the tidal
rise and fall of the Atlantic Ocean is greater than flooding from
any fluvial sources. In some situations, depending upon the extent
of the storm surge from a particular storm event, a flood hazard area
may be tidal in the 100-year storm, but fluvial in more frequent storm
events.
A neighborhood given priority access to state resources through
the New Jersey Redevelopment Authority.
A zone designated by the New Jersey Enterprise Zone Authority
pursuant to the New Jersey Urban Enterprise Zones Act, N.J.S.A. 52:27H-60
et seq.
Previously developed portions of areas:
A structure within, or adjacent to, a water, which intentionally
or coincidentally alters the hydraulic capacity, the flood elevation
resulting from the two-, ten-, or 100-year storm, flood hazard area
limit, and/or floodway limit of the water. Examples of a water control
structure may include a bridge, culvert, dam, embankment, ford (if
above grade), retaining wall, and weir.
The ocean and its estuaries, all springs, streams, wetlands,
and bodies of surface water or groundwater, whether natural or artificial,
within the boundaries of the State of New Jersey or subject to its
jurisdiction.
An area that is inundated or saturated by surface water or
groundwater at a frequency and duration sufficient to support, and
that under normal circumstances does support, a prevalence of vegetation
typically adapted for life in saturated soil conditions, commonly
known as "hydrophytic vegetation."
A.
Stormwater management measures for major development shall be designed
to provide erosion control, groundwater recharge, stormwater runoff
quantity control, and stormwater runoff quality treatment as follows:
(1)
The minimum standards for erosion control are those established under
the Soil and Sediment Control Act, N.J.S.A. 4:24-39 et seq., and implementing
rules at N.J.A.C. 2:90.
(2)
The minimum standards for groundwater recharge, stormwater quality,
and stormwater runoff quantity shall be met by incorporating green
infrastructure.
B.
The standards in this article apply only to new major development
and are intended to minimize the impact of stormwater runoff on water
quality and water quantity in receiving water bodies and maintain
groundwater recharge. The standards do not apply to new major development
to the extent that alternative design and performance standards are
applicable under a regional stormwater management plan or water quality
management plan adopted in accordance with Department rules.
A.
The development shall incorporate a maintenance plan for the stormwater management measures incorporated into the design of a major development in accordance with § 335-22.
B.
Stormwater management measures shall avoid adverse impacts of concentrated
flow on habitat for threatened and endangered species as documented
in the Department's Landscape Project or Natural Heritage Database
established under N.J.S.A. 13:1B-15.147 through 13:1B-15.150, particularly
Helonias bullata (swamp pink) and/or Clemmys muhlenbergii (bog turtle).
C.
The following linear development projects are exempt from the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity requirements of § 335-16P, Q and R:
(1)
The construction of an underground utility line, provided that the
disturbed areas are revegetated upon completion;
(2)
The construction of an aboveground utility line, provided that the
existing conditions are maintained to the maximum extent practicable;
and
(3)
The construction of a public pedestrian access, such as a sidewalk
or trail with a maximum width of 14 feet, provided that the access
is made of permeable material.
D.
A waiver from strict compliance from the green infrastructure, groundwater recharge, stormwater runoff quality, and stormwater runoff quantity requirements of § 335-16O, P, Q and R may be obtained for the enlargement of an existing public roadway or railroad; or the construction or enlargement of a public pedestrian access, provided that the following conditions are met:
(1)
The applicant demonstrates that there is a public need for the project
that cannot be accomplished by any other means;
(4)
The applicant demonstrates that it does not own or have other rights to areas, including the potential to obtain through condemnation lands not falling under § 335-16D(3) above within the upstream drainage area of the receiving stream, that would provide additional opportunities to mitigate the requirements of § 335-16O, P, Q and R that were not achievable on-site.
E.
Tables 1 through 3 below summarize the ability of stormwater best management practices identified and described in the New Jersey Stormwater Best Management Practices Manual to satisfy the green infrastructure, groundwater recharge, stormwater runoff quality and stormwater runoff quantity standards specified in § 335-16O, P, Q and R. When designed in accordance with the most current version of the New Jersey Stormwater Best Management Practices Manual, the stormwater management measures found at N.J.A.C. 7:8-5.2(f), Tables 5-1, 5-2 and 5-3, and listed below in Tables 1, 2 and 3 are presumed to be capable of providing stormwater controls for the design and performance standards as outlined in the tables below. Upon amendments of the New Jersey Stormwater Best Management Practices to reflect additions or deletions of BMPs meeting these standards, or changes in the presumed performance of BMPs designed in accordance with the New Jersey Stormwater BMP Manual, the Department shall publish in the New Jersey Registers a notice of administrative change revising the applicable table. The most current version of the BMP Manual can be found on the Department's website at https://njstormwater.org/bmp_manual2.htm.
F.
Where the BMP tables in the NJ Stormwater Management Rule are different
due to updates or amendments with the tables in this article, the
BMP Tables in the Stormwater Management Rule at N.J.A.C. 7:8-5.2(f)
shall take precedence.
|
Table 1
Green Infrastructure BMPs for Groundwater Recharge, Stormwater
Runoff Quality, and/or Stormwater Runoff Quantity
| ||||
|---|---|---|---|---|
|
Best Management Practice
|
Stormwater Runoff Quality TSS Removal Rate
|
Stormwater Runoff Quantity
|
Groundwater Recharge
|
Minimum Separation from Seasonal High-Water Table
(feet)
|
|
Cistern
|
0%
|
Yes
|
No
|
—
|
|
Dry well(a)
|
0%
|
No
|
Yes
|
2
|
|
Grass swale
|
50% or less
|
No
|
No
|
2(e)
1(f)
|
|
Green roof
|
0%
|
Yes
|
No
|
—
|
|
Manufactured treatment device(a)(g)
|
50% or 80%
|
No
|
No
|
Dependent upon the device
|
|
Pervious paving system(a)
|
80%
|
Yes
|
Yes(b)
No(c)
|
2(b)
1(c)
|
|
Small-scale bioretention basin(a)
|
80% or 90%
|
Yes
|
Yes(b)
No(c)
|
2(b)
1(c)
|
|
Small-scale infiltration basin(a)
|
80%
|
Yes
|
Yes
|
2
|
|
Small-scale sand filter
|
80%
|
Yes
|
Yes
|
2
|
|
Vegetative filter strip
|
60% to 80%
|
No
|
No
|
—
|
|
(Notes corresponding to annotations (a) through (g) are found after Table 3.)
|
|
Table 2
Green Infrastructure BMPs for Stormwater Runoff Quantity
(or for Groundwater Recharge and/or Stormwater Runoff Quality
with a Waiver or Variance from N.J.A.C. 7:8-5.3)
| ||||
|---|---|---|---|---|
|
Best Management Practice
|
Stormwater Runoff Quality TSS Removal Rate
|
Stormwater Runoff Quantity
|
Groundwater Recharge
|
Minimum Separation from Seasonal High-Water Table
(feet)
|
|
Bioretention system
|
80% or 90%
|
Yes
|
Yes(b)
No(c)
|
2(b)
1(c)
|
|
Infiltration basin
|
80%
|
Yes
|
Yes
|
2
|
|
Sand filter(b)
|
80%
|
Yes
|
Yes
|
2
|
|
Standard constructed wetland
|
90%
|
Yes
|
No
|
N/A
|
|
Wet pond(d)
|
50% to 90%
|
Yes
|
No
|
N/A
|
|
(Notes corresponding to annotations (b) through (d) are found after Table 3.)
|
|
Table 3
BMPs for Groundwater Recharge, Stormwater Runoff Quality, and/or
Stormwater Runoff Quantity
only with a Waiver or Variance from N.J.A.C. 7:8-5.3
| ||||
|---|---|---|---|---|
|
Best Management Practice
|
Stormwater Runoff Quality TSS Removal Rate
|
Stormwater Runoff Quantity
|
Groundwater Recharge
|
Minimum Separation from Seasonal High-Water Table
(feet)
|
|
Blue roof
|
0%
|
Yes
|
No
|
N/A
|
|
Extended detention basin
|
40% to 60%
|
Yes
|
No
|
1
|
|
Manufactured treatment device(h)
|
50% or 80%
|
No
|
No
|
Dependent upon the device
|
|
Sand filter(c)
|
80%
|
Yes
|
No
|
1
|
|
Subsurface gravel wetland
|
90%
|
No
|
No
|
1
|
|
Wet pond
|
50% to 90%
|
Yes
|
No
|
N/A
|
|
Notes to Tables 1, 2, and 3:
| |
|---|---|
|
(a)
|
Subject to the applicable contributory drainage area limitation specified at § 335-16O(2);
|
|
(b)
|
Designed to infiltrate into the subsoil;
|
|
(c)
|
Designed with underdrains;
|
|
(d)
|
Designed to maintain at least a ten-foot-wide area of native
vegetation along at least 50% of the shoreline and to include a stormwater
runoff retention component designed to capture stormwater runoff for
beneficial reuse, such as irrigation;
|
|
(e)
|
Designed with a slope of less than 2%;
|
|
(f)
|
Designed with a slope of equal to or greater than 2%;
|
|
(g)
|
Manufactured treatment devices that meet the definition of "green infrastructure" at § 335-14;
|
|
(h)
|
Manufactured treatment devices that do not meet the definition of "green infrastructure" at § 335-14.
|
G.
An alternative stormwater management measure, alternative removal rate, and/or alternative method to calculate the removal rate may be used if the design engineer demonstrates the capability of the proposed alternative stormwater management measure and/or the validity of the alternative rate or method to the municipality. A copy of any approved alternative stormwater management measure, alternative removal rate, and/or alternative method to calculate the removal rate shall be provided to the Department in accordance with § 335-18B. Alternative stormwater management measures may be used to satisfy the requirements at § 335-16O only if the measures meet the definition of "green infrastructure" at § 335-14. Alternative stormwater management measures that function in a similar manner to a BMP listed at Subsection O(2) are subject to the contributory drainage area limitation specified at Subsection O(2) for that similarly functioning BMP. Alternative stormwater management measures approved in accordance with this subsection that do not function in a similar manner to any BMP listed at Subsection O(2) shall have a contributory drainage area less than or equal to 2.5 acres, except for alternative stormwater management measures that function similarly to cisterns, grass swales, green roofs, standard constructed wetlands, vegetative filter strips, and wet ponds, which are not subject to a contributory drainage area limitation. Alternative measures that function similarly to standard constructed wetlands or wet ponds shall not be used for compliance with the stormwater runoff quality standard unless a variance in accordance with N.J.A.C. 7:8-4.6 or a waiver from strict compliance in accordance with § 335-16D is granted from § 335-16O.
H.
Whenever the stormwater management design includes one or more BMPs
that will infiltrate stormwater into subsoil, the design engineer
shall assess the hydraulic impact on the groundwater table and design
the site, so as to avoid adverse hydraulic impacts. Potential adverse
hydraulic impacts include, but are not limited to, exacerbating a
naturally or seasonally high-water table, so as to cause surficial
ponding, flooding of basements, or interference with the proper operation
of subsurface sewage disposal systems or other subsurface structures
within the zone of influence of the groundwater mound, or interference
with the proper functioning of the stormwater management measure itself.
I.
Design standards for stormwater management measures are as follows:
(1)
Stormwater management measures shall be designed to take into account
the existing site conditions, including, but not limited to, environmentally
critical areas; wetlands; flood-prone areas; slopes; depth to seasonal
high-water table; soil type, permeability, and texture; drainage area
and drainage patterns; and the presence of solution-prone carbonate
rocks (limestone);
(2)
Stormwater management measures shall be designed and demonstrated
not to negatively impact wetlands or watercourses on site or adjacent
to the property.
(3)
Stormwater management measures shall be designed to minimize maintenance, facilitate maintenance and repairs, and ensure proper functioning. Trash racks shall be installed at the intake to the outlet structure, as appropriate, and shall have parallel bars with one-inch 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 1/3 the width of the diameter of the orifice or 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. In addition, the design of trash racks must comply with the requirements of § 335-20C;
(4)
Stormwater management measures shall be designed, constructed, and
installed to be strong, durable, and corrosion resistant. Measures
that are consistent with the relevant portions of the Residential
Site Improvement Standards at N.J.A.C. 5:21-7.3, 5:21-7.4, and 5:21-7.5
shall be deemed to meet this requirement;
(5)
Stormwater management BMPs shall be designed to meet the minimum safety standards for stormwater management BMPs at § 335-20; and
(6)
The size of the orifice at the intake to the outlet from the stormwater
management BMP shall be a minimum of 2 1/2 inches in diameter.
J.
Manufactured treatment devices may be used to meet the requirements of this article, provided the pollutant removal rates are verified by the New Jersey Corporation for Advanced Technology and certified by the Department. Manufactured treatment devices that do not meet the definition of "green infrastructure" at § 335-14 may be used only under the circumstances described at § 335-16O(4).
K.
Any application for a new agricultural development that meets the definition of "major development" at § 335-14 shall be submitted to the soil conservation district for review and approval in accordance with the requirements at § 335-16O, P, Q and R and any applicable soil conservation district guidelines for stormwater runoff quantity and erosion control. For purposes of this subsection, "agricultural development" means land uses normally associated with the production of food, fiber, and livestock for sale. Such uses do not include the development of land for the processing or sale of food and the manufacture of agriculturally related products.
L.
If there is more than one drainage area, the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 335-16P, Q and R shall be met in each drainage area, unless the runoff from the drainage areas converge on-site and no adverse environmental impact would occur as a result of compliance with any one or more of the individual standards being determined utilizing a weighted average of the results achieved for that individual standard across the affected drainage areas.
M.
Any stormwater management measure authorized under the municipal stormwater management plan or ordinance shall be reflected in a deed notice recorded with the office of the Gloucester County Clerk. A form of deed notice shall be submitted to the municipality for approval prior to filing. The deed notice shall contain a description of the stormwater management measure(s) used to meet the green infrastructure, groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 335-16O, P, Q and R and shall identify the location of the stormwater management measure(s) in NAD 1983 State Plane New Jersey FIPS 2900 US feet or latitude and longitude in decimal degrees. The deed notice shall also reference the maintenance plan required to be recorded upon the deed pursuant to § 335-22B(5). Prior to the commencement of construction, proof that the above required deed notice has been filed shall be submitted to the municipality. Proof that the required information has been recorded on the deed shall be in the form of either a copy of the complete recorded document or a receipt from the Clerk or other proof of recordation provided by the recording office. However, if the initial proof provided to the municipality is not a copy of the complete recorded document, a copy of the complete recorded document shall be provided to the municipality within 180 calendar days of the authorization granted by the municipality.
N.
A stormwater management measure approved under the municipal stormwater management plan or ordinance may be altered or replaced with the approval of the municipality, if the municipality determines that the proposed alteration or replacement meets the design and performance standards pursuant to § 335-16 of this article and provides the same level of stormwater management as the previously approved stormwater management measure that is being altered or replaced. If an alteration or replacement is approved, a revised deed notice shall be submitted to the municipality for approval and subsequently recorded with the office of the Gloucester County Clerk and shall contain a description and location of the stormwater management measure, as well as reference to the maintenance plan, in accordance with Subsection M above. Prior to the commencement of construction, proof that the above required deed notice has been filed shall be submitted to the municipality in accordance with Subsection M above.
O.
Green infrastructure standards.
(1)
This subsection specifies the types of green infrastructure BMPs
that may be used to satisfy the groundwater recharge, stormwater runoff
quality, and stormwater runoff quantity standards.
(2)
To satisfy the groundwater recharge and stormwater runoff quality standards at § 335-16P and Q, the design engineer shall utilize green infrastructure BMPs identified in Table 1 at § 335-16F and/or an alternative stormwater management measure approved in accordance with § 335-16G. The following green infrastructure BMPs are subject to the following maximum contributory drainage area limitations:
|
Best Management Practice
|
Maximum Contributory Drainage Area
(acres)
|
|---|---|
|
Dry well
|
1
|
|
Manufactured treatment device
|
2.5
|
|
Pervious pavement systems
|
Area of additional inflow cannot exceed 3 times the area occupied
by the BMP
|
|
Small-scale bioretention systems
|
2.5
|
|
Small-scale infiltration basin
|
2.5
|
|
Small-scale sand filter
|
2.5
|
(4)
If a variance in accordance with N.J.A.C. 7:8-4.6 or a waiver from strict compliance in accordance with § 335-16D is granted from the requirements of this subsection, then BMPs from Table 1, 2, or 3, and/or an alternative stormwater management measure approved in accordance with § 335-16G, may be used to meet the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 335-16P, Q and R.
(5)
For separate or combined storm sewer improvement projects, such as sewer separation, undertaken by a government agency or public utility (for example, a sewerage company), the requirements of this subsection shall only apply to areas owned in fee simple by the government agency or utility, and areas within a right-of-way or easement held or controlled by the government agency or utility; the entity shall not be required to obtain additional property or property rights to fully satisfy the requirements of this subsection. Regardless of the amount of area of a separate or combined storm sewer improvement project subject to the green infrastructure requirements of this subsection, each project shall fully comply with the applicable groundwater recharge, stormwater runoff quality control, and stormwater runoff quantity standards at § 335-16P, Q and R, unless the project is granted a waiver from strict compliance in accordance with § 335-16D.
P.
Groundwater recharge standards.
(1)
This subsection contains the minimum design and performance standards
for groundwater recharge as follows.
(2)
The design engineer shall, using the assumptions and factors for stormwater runoff and groundwater recharge calculations at § 335-17, either:
(a)
Demonstrate through hydrologic and hydraulic analysis that the
site and its stormwater management measures maintain 100% of the average
annual preconstruction groundwater recharge volume for the site; or
(b)
Demonstrate through hydrologic and hydraulic analysis that the
increase of stormwater runoff volume from preconstruction to post-construction
for the two-year storm is infiltrated.
(3)
This groundwater recharge requirement does not apply to projects within the urban redevelopment area, or to projects subject to Subsection P(4) below.
(4)
The following types of stormwater shall not be recharged:
(a)
Stormwater from areas of high pollutant loading. High pollutant
loading areas are areas in industrial and commercial developments
where solvents and/or petroleum products are loaded/unloaded, stored,
or applied, areas where pesticides are loaded/unloaded or stored;
areas where hazardous materials are expected to be present in greater
than "reportable quantities" as defined by the United States Environmental
Protection Agency (EPA) at 40 CFR 302.4; areas where recharge would
be inconsistent with Department-approved remedial action work plan
or landfill closure plan and areas with high risks for spills of toxic
materials, such as gas stations and vehicle maintenance facilities;
and
(b)
Industrial stormwater exposed to source material. "Source material"
means any material(s) or machinery, located at an industrial facility,
that is directly or indirectly related to process, manufacturing or
other industrial activities, which could be a source of pollutants
in any industrial stormwater discharge to groundwater. Source materials
include, but are not limited to, raw materials; intermediate products;
final products; waste materials; by-products; industrial machinery
and fuels, and lubricants, solvents, and detergents that are related
to process, manufacturing, or other industrial activities that are
exposed to stormwater.
Q.
Stormwater runoff quality standards.
(1)
This subsection contains the minimum design and performance standards
to control stormwater runoff quality impacts of major development.
Stormwater runoff quality standards are applicable when the major
development results in an increase of 1/4 acre or more of regulated
motor vehicle surface.
(2)
Stormwater management measures shall be designed to reduce the post-construction
load of total suspended solids (TSS) in stormwater runoff generated
from the water quality design storm as follows:
(a)
Eighty percent TSS removal of the anticipated load, expressed
as an annual average, shall be achieved for the stormwater runoff
from the net increase of motor vehicle surface.
(b)
If the surface is considered regulated motor vehicle surface
because the water quality treatment for an area of motor vehicle surface
that is currently receiving water quality treatment either by vegetation
or soil, by an existing stormwater management measure, or by treatment
at a wastewater treatment plant is to be modified or removed, the
project shall maintain or increase the existing TSS removal of the
anticipated load expressed as an annual average.
(3)
The requirement to reduce TSS does not apply to any stormwater runoff in a discharge regulated under a numeric effluent limitation for TSS imposed under the New Jersey Pollutant Discharge Elimination System (NJPDES) rules, N.J.A.C. 7:14A, or in a discharge specifically exempt under a NJPDES permit from this requirement. Every major development, including any that discharge into a combined sewer system, shall comply with Subsection Q(2) above, unless the major development is itself subject to a NJPDES permit with a numeric effluent limitation for TSS or the NJPDES permit to which the major development is subject exempts the development from a numeric effluent limitation for TSS.
(4)
The water quality design storm is 1.25 inches of rainfall in two
hours. Water quality calculations shall take into account the distribution
of rain from the water quality design storm, as reflected in Table
4, below. The calculation of the volume of runoff may take into account
the implementation of stormwater management measures.
|
Table 4
Water Quality Design Storm Distribution
| |||||
|---|---|---|---|---|---|
|
Time
(minutes)
|
Cumulative Rainfall
(inches)
|
Time
(minutes)
|
Cumulative Rainfall
(inches)
|
Time
(minutes)
|
Cumulative Rainfall
(inches)
|
|
1
|
0.00166
|
41
|
0.17280
|
81
|
1.09060
|
|
2
|
0.00332
|
42
|
0.17960
|
82
|
1.09720
|
|
3
|
0.00498
|
43
|
0.18640
|
83
|
1.10380
|
|
4
|
0.00664
|
44
|
0.19320
|
84
|
1.11040
|
|
5
|
0.00830
|
45
|
0.20000
|
85
|
1.11700
|
|
6
|
0.00996
|
46
|
0.21170
|
86
|
1.12360
|
|
7
|
0.01162
|
47
|
0.22330
|
87
|
1.13020
|
|
8
|
0.01328
|
48
|
0.23500
|
88
|
1.13680
|
|
9
|
0.01494
|
49
|
0.24660
|
89
|
1.14340
|
|
10
|
0.01660
|
50
|
0.25830
|
90
|
1.15000
|
|
11
|
0.01828
|
51
|
0.27830
|
91
|
1.15500
|
|
12
|
0.01996
|
52
|
0.29830
|
92
|
1.16000
|
|
13
|
0.02164
|
53
|
0.31830
|
93
|
1.16500
|
|
14
|
0.02332
|
54
|
0.33830
|
94
|
1.17000
|
|
15
|
0.02500
|
55
|
0.35830
|
95
|
1.17500
|
|
16
|
0.03000
|
56
|
0.41160
|
96
|
1.18000
|
|
17
|
0.03500
|
57
|
0.46500
|
97
|
1.18500
|
|
18
|
0.04000
|
58
|
0.51830
|
98
|
1.19000
|
|
19
|
0.04500
|
59
|
0.57170
|
99
|
1.19500
|
|
20
|
0.05000
|
60
|
0.62500
|
100
|
1.20000
|
|
21
|
0.05500
|
61
|
0.67830
|
101
|
1.20500
|
|
22
|
0.06000
|
62
|
0.73170
|
102
|
1.21000
|
|
23
|
0.06500
|
63
|
0.78500
|
103
|
1.21500
|
|
24
|
0.07000
|
64
|
0.83840
|
104
|
1.22000
|
|
25
|
0.07500
|
65
|
0.89170
|
105
|
1.22500
|
|
26
|
0.08000
|
66
|
0.91170
|
106
|
1.22670
|
|
27
|
0.08500
|
67
|
0.93170
|
107
|
1.22840
|
|
28
|
0.09000
|
68
|
0.95170
|
108
|
1.23000
|
|
29
|
0.09500
|
69
|
0.97170
|
109
|
1.23170
|
|
30
|
0.10000
|
70
|
0.99170
|
110
|
1.23340
|
|
31
|
0.10660
|
71
|
1.00340
|
111
|
1.23510
|
|
32
|
0.11320
|
72
|
1.01500
|
112
|
1.23670
|
|
33
|
0.11980
|
73
|
1.02670
|
113
|
1.23840
|
|
34
|
0.12640
|
74
|
1.03830
|
114
|
1.24000
|
|
35
|
0.13300
|
75
|
1.05000
|
115
|
1.24170
|
|
36
|
0.13960
|
76
|
1.05680
|
116
|
1.24340
|
|
37
|
0.14620
|
77
|
1.06360
|
117
|
1.24500
|
|
38
|
0.15280
|
78
|
1.07040
|
118
|
1.24670
|
|
39
|
0.15940
|
79
|
1.07720
|
119
|
1.24830
|
|
40
|
0.16600
|
80
|
1.08400
|
120
|
1.25000
|
(5)
If more than one BMP in series is necessary to achieve the required
80% TSS reduction for a site, the applicant shall utilize the following
formula to calculate TSS reduction:
|
R = A + B - (A x B)/100
|
|
Where:
| ||
|
R
|
=
|
total TSS percent load removal from application of both BMPs.
|
|
A
|
=
|
the TSS percent removal rate applicable to the first BMP.
|
|
B
|
=
|
the TSS percent removal rate applicable to the second BMP.
|
(6)
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 green infrastructure BMPs that optimize nutrient removal while still achieving the performance standards in § 335-16P, Q and R.
(7)
In accordance with the definition of "FW1" at N.J.A.C. 7:9B-1.4,
stormwater management measures shall be designed to prevent any increase
in stormwater runoff to waters classified as FW1.
(8)
The Flood Hazard Area Control Act Rules at N.J.A.C. 7:13-4.1(c)1
establish 300-foot riparian zones along Category One waters, as designated
in the Surface Water Quality Standards at N.J.A.C. 7:9B, and certain
upstream tributaries to Category One waters. A person shall not undertake
a major development that is located within or discharges into a 300-foot
riparian zone without prior authorization from the Department under
N.J.A.C. 7:13.
(9)
Pursuant to the Flood Hazard Area Control Act Rules at N.J.A.C. 7:13-11.2(j)3i,
runoff from the water quality design storm that is discharged within
a 300-foot riparian zone shall be treated in accordance with this
subsection to reduce the post- construction load of total suspended
solids by 95% of the anticipated load from the developed site, expressed
as an annual average.
(10)
This stormwater runoff quality standards do not apply to the
construction of one individual single-family dwelling, provided that
it is not part of a larger development or subdivision that has received
preliminary or final site plan approval prior to December 3, 2018,
and that the motor vehicle surfaces are made of permeable material(s),
such as gravel, dirt, and/or shells.
R.
Stormwater runoff quantity standards.
(1)
This subsection contains the minimum design and performance standards
to control stormwater runoff quantity impacts of major development.
(2)
In order to control stormwater runoff quantity impacts, the design engineer shall, using the assumptions and factors for stormwater runoff calculations at § 335-17, complete one of the following:
(a)
Demonstrate through hydrologic and hydraulic analysis that for
stormwater leaving the site, post-construction runoff hydrographs
for the two-, ten-, and 100-year storm events do not exceed, at any
point in time, the preconstruction runoff hydrographs for the same
storm events;
(b)
Demonstrate through hydrologic and hydraulic analysis that there
is no increase, as compared to the preconstruction condition, in the
peak runoff rates of stormwater leaving the site for the two-, ten-
and 100-year storm events and that the increased volume or change
in timing of stormwater runoff will not increase flood damage at or
downstream of the site. This analysis shall include the analysis of
impacts of existing land uses and projected land uses assuming full
development under existing zoning and land use ordinances in the drainage
area;
(c)
Design stormwater management measures so that the post-construction
peak runoff rates for the two-, ten- and 100-year storm events are
50%, 75% and 80%, respectively, of the preconstruction peak runoff
rates. The percentages apply only to the post-construction stormwater
runoff that is attributable to the portion of the site on which the
proposed development or project is to be constructed; or
(d)
In tidal flood hazard areas, stormwater runoff quantity analysis in accordance with Subsection R(2)(a), (b) and (c) above is required unless the design engineer demonstrates through hydrologic and hydraulic analysis that the increased volume, change in timing, or increased rate of the stormwater runoff, or any combination of the three will not result in additional flood damage below the point of discharge of the major development. No analysis is required if the stormwater is discharged directly into any ocean, bay, inlet, or the reach of any watercourse between its confluence with an ocean, bay, or inlet and downstream of the first water control structure.
(3)
The stormwater runoff quantity standards shall be applied at the
site's boundary to each abutting lot, roadway, watercourse, or receiving
storm sewer system.
A.
The following requirements shall apply to all developments that require
minor or major site plan or subdivision approval from the Franklin
Township Land Use Board but are not defined as a major development
from a stormwater standpoint:
B.
A property owner shall not regrade or construct improvements on their
property, such as retaining walls, landscape beds, sheds or pools,
etc., in such a manner that will adversely impact the flow of stormwater
runoff off of or onto an adjoining property. Regrading a property,
inclusive of activities related to farming or agriculture, in a manner
that increases the peak rate of runoff or volume of runoff directed
toward an adjacent property shall not be permitted without grading
or stormwater management plan approval issued by the Township Engineer.
A.
Stormwater runoff shall be calculated in accordance with the following:
(1)
The design engineer shall calculate runoff using one of the following
methods:
(a)
The USDA Natural Resources Conservation Service (NRCS) methodology, including the NRCS Runoff Equation and Dimensionless Unit Hydrograph, as described in Chapters 7, 9, 10, 15 and 16, Part 630, Hydrology National Engineering Handbook, incorporated herein by reference as amended and supplemented. This methodology is additionally described in Technical Release 55 - Urban Hydrology for Small Watersheds (TR-55), dated June 1986, incorporated herein by reference as amended and supplemented. Information regarding the methodology is available from the Natural Resources Conservation Service website at https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1044171.pdf or at United States Department of Agriculture Natural Resources Conservation Service, 220 Davison Avenue, Somerset, New Jersey 08873; or
(b)
The Rational Method for peak flow and the Modified Rational
Method for hydrograph computations. The Rational and Modified Rational
Methods are described in "Appendix A-9 Modified Rational Method" in
the Standards for Soil Erosion and Sediment Control in New Jersey,
January 2014. This document is available from the State Soil Conservation
Committee or any of the soil conservation districts listed at N.J.A.C.
2:90-1.3(a)3. The location, address, and telephone number for each
soil conservation district is available from the State Soil Conservation
Committee, PO Box 330, Trenton, New Jersey 08625. The document is
also available at http://www.nj.gov/agriculture/divisions/anr/pdf/2014NJSoilErosionControlStandardsComplete.pdf.
(2)
For the purpose of calculating runoff coefficients and groundwater recharge, there is a presumption that the preconstruction condition of a site or portion thereof is a wooded land use with good hydrologic condition. The term "runoff coefficient" applies to both the NRCS methodology above at § 335-17A(1)(a) and the Rational and Modified Rational Methods at § 335-17A(1)(b). A runoff coefficient or a groundwater recharge land cover for an existing condition may be used on all or a portion of the site if the design engineer verifies that the hydrologic condition has existed on the site or portion of the site for at least five years without interruption prior to the time of application. If more than one land cover have existed on the site during the five years immediately prior to the time of application, the land cover with the lowest runoff potential shall be used for the computations. In addition, there is the presumption that the site is in good hydrologic condition (if the land use type is pasture, lawn, or park), with good cover (if the land use type is woods), or with good hydrologic condition and conservation treatment (if the land use type is cultivation).
(3)
In computing preconstruction stormwater runoff, the design engineer
shall account for all significant land features and structures that
may reduce preconstruction stormwater runoff rates and volumes, such
as ponds, wetlands, depressions, hedgerows, or culverts.
(4)
In computing stormwater runoff from all design storms, the design
engineer shall consider the relative stormwater runoff rates and/or
volumes of pervious and impervious surfaces separately to accurately
compute the rates and volume of stormwater runoff from the site. To
calculate runoff from unconnected impervious cover, urban impervious
area modifications as described in the NRCS Technical Release 55 -
Urban Hydrology for Small Watersheds or other methods may be employed.
(5)
If the invert of the outlet structure of a stormwater management
measure is below the flood hazard design flood elevation as defined
at N.J.A.C. 7:13, the design engineer shall take into account the
effects of tailwater in the design of structural stormwater management
measures.
B.
Groundwater recharge may be calculated in accordance with the following:
the New Jersey Geological Survey Report GSR-32, A Method for Evaluating
Ground-Water-Recharge Areas in New Jersey, incorporated herein by
reference as amended and supplemented. Information regarding the methodology
is available from the New Jersey Stormwater Best Management Practices
Manual; at the New Jersey Geological Survey website at https://www.nj.gov/dep/njgs/pricelst/gsreport/gsr32.pdf
or at New Jersey Geological and Water Survey, 29 Arctic Parkway, PO
Box 420 Mail Code 29-01, Trenton, New Jersey 08625-0420.
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: http://www.nj.gov/dep/stormwater/bmp_manual2.htm.
(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://www.njstormwater.org/maintenance_guidance.htm.
B.
Submissions required for review by the Department should be mailed
to: the Division of Water Quality, New Jersey Department of Environmental
Protection, Mail Code 401-02B, PO Box 420, Trenton, New Jersey 08625-0420.
A.
Site design features identified under § 335-16F above, or alternative designs in accordance with § 335-16G 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 subsection, "solid and floatable materials" means sediment, debris, trash, and other floating, suspended, or settleable solids. For exemptions to this standard see § 335-19A(2) 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:
(a)
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
(b)
A different grate, if each individual clear space in that grate
has an area of no more than 7.0 square inches, or is no greater than
0.5 inch 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.
(c)
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 7.0 square inches, or be no greater than 2.0
inches across the smallest dimension.
(2)
The standard in Subsection A(1) above does not apply:
(a)
Where each individual clear space in the curb opening in existing
curb-opening inlet does not have an area of more than 9.0 square inches;
(b)
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;
(c)
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:
[1]
A rectangular space 4.625 inches long and 1.5 inches wide (this
option does not apply for outfall netting facilities); or
[2]
A bar screen having a bar spacing of 0.5 inch.
[3]
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 5:21-7.4(b)1].
(d)
Where flows are conveyed through a trash rack that has parallel
bars with one-inch spacing between the bars, to the elevation of the
water quality design storm as specified in N.J.A.C. 7:8; or
(e)
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.
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 § 335-20C(1), (2), and (3) 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:
(a)
The trash rack shall have parallel bars, with no greater than
six-inch spacing between the bars;
(b)
The trash rack shall be designed so as not to adversely affect
the hydraulic performance of the outlet pipe or structure;
(c)
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
(d)
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:
(a)
The overflow grate shall be secured to the outlet structure
but removable for emergencies and maintenance.
(b)
The overflow grate spacing shall be no less than two inches
across the smallest dimension.
(c)
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:
(a)
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 the prior approval of the municipality pursuant to § 335-20, a freestanding outlet structure may be exempted from this requirement;
(b)
Safety ledges shall be constructed on the slopes of all new stormwater management BMPs having a permanent pool of water deeper than 2 1/2 feet. Safety ledges shall be comprised of two steps. Each step shall be four feet to six feet in width. One step shall be located approximately 2 1/2 feet below the permanent water surface, and the second step shall be located one foot to 1 1/2 feet above the permanent water surface. See § 335-20E for an illustration of safety ledges in a stormwater management BMP; and
(c)
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.
 |
A.
Submission of site development stormwater plan.
(1)
Whenever an applicant seeks municipal approval of a development subject to this article, the applicant shall submit all of the required components of the Checklist for the Site Development Stormwater Plan at § 335-21C 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 article.
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
article.
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 one inch equals 200 feet or greater, showing two-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 floodplains 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
man-made 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 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. This plan shall provide a demonstration of how the goals and standards of §§ 335-15 through 335-17 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:
(a)
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.
(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 and emergency
spillway provisions with maximum discharge capacity of each spillway.
(6)
Calculations.
(a)
Comprehensive hydrologic and hydraulic design calculations for the predevelopment and post-development conditions for the design storms specified in § 335-16 of this article.
(b)
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 on-site 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 § 335-22.
(8)
Waiver from submission requirements. The municipal official or board reviewing an application under this article may, in consultation with the municipality's review engineer, waive submission of any of the requirements in § 335-21C(1) through (6) of this article 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.
B.
General maintenance.
(1)
The design engineer shall prepare a maintenance plan for the stormwater
management measures incorporated into the design of a major development.
(2)
The maintenance plan shall contain specific preventative maintenance
tasks and schedules; cost estimates, including estimated cost of sediment,
debris, or trash removal; and the name, address, and telephone number
of the person or persons responsible for preventative and corrective
maintenance (including replacement). The plan shall contain information
on BMP location, design, ownership, maintenance tasks and frequencies,
and other details as specified in Chapter 8 of the NJ BMP Manual,
as well as the tasks specific to the type of BMP, as described in
the applicable chapter containing design specifics.
(3)
If the maintenance plan identifies a person other than the property
owner (for example, a developer, a public agency or homeowners' association)
as having the responsibility for maintenance, the plan shall include
documentation of such person's or entity's agreement to assume this
responsibility, or of the owner's obligation to dedicate a stormwater
management facility to such person under an applicable ordinance or
regulation.
(4)
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. The individual property
owner may be assigned incidental tasks, such as weeding of a green
infrastructure BMP, provided the individual agrees to assume these
tasks; however, the individual cannot be legally responsible for all
of the maintenance required.
(5)
If the party responsible for maintenance identified under Subsection B above is not a public agency, the maintenance plan and any future revisions based on § 335-22B(7) below shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan must be undertaken.
(6)
Preventative and corrective maintenance shall be performed to maintain
the functional parameters (storage volume, infiltration rates, inflow/outflow
capacity, etc.) of the stormwater management measure, including, but
not limited to, 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.
(7)
The party responsible for maintenance identified under § 335-22B(3) above shall perform all of the following requirements:
(a)
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;
(b)
Evaluate the effectiveness of the maintenance plan at least
once per year and adjust the plan and the deed as needed; and
(c)
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 by § 335-22B(6) and (7) above.
(8)
The requirements of § 335-22B(3) and (4) do not apply to stormwater management facilities that are dedicated to and accepted by the municipality or another governmental agency, subject to all applicable municipal stormwater general permit conditions, as issued by the Department.
(9)
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 person
in writing. Upon receipt of that notice, the responsible person shall
have 14 days to effect maintenance and repair of the facility in a
manner that is approved by the Municipal Engineer or his designee.
The municipality, in its discretion, may extend the time allowed for
effecting maintenance and repair for good cause. If the responsible
person 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 person. Nonpayment of such
bill may result in a lien on the property.
(10)
The property owner of any commercial development shall be responsible
for maintenance of all stormwater management improvements associated
with said development. Ownership and maintenance of stormwater management
improvements for residential projects shall be the responsibility
of a homeowners' association for single-family subdivision or multifamily
site plan residential projects unless maintenance responsibilities
of the stormwater management improvements associated with the residential
project is accepted by the Township Committee by resolution or ordinance.
An appropriate maintenance fee shall be levied by the governing body
should maintenance responsibilities be accepted. The fees shall be
based on routine, short-term and long-term maintenance to be performed
over a twenty-year period.
C.
Nothing in this subsection shall preclude the municipality in which
the major development is located from requiring the posting of a performance
or maintenance guarantee in accordance with N.J.S.A. 40:55D-53.
Any person(s) who erects, constructs, alters, repairs, converts,
maintains, or uses any building, structure or land in violation of
this article shall be subject to the following penalties:
A.
A fine not to exceed $1,000 per day for every day that the provisions
of this article are violated. Each day that the provisions of this
article are violated shall be deemed a separate offense. All violations
of this article shall be prosecuted in the Municipal Court of the
Township of Franklin or any other tribunal with subject matter jurisdiction.
Each section, subsection, sentence, clause and phrase of this
article is declared to be an independent section, subsection, sentence,
clause and phrase, and the finding or holding of any such portion
of this article to be unconstitutional, void, or ineffective for any
cause, or reason, shall not affect any other portion of this article.
This article shall be in full force and effect from and after
its adoption and any publication as required by law.
