[HISTORY: Adopted by the Mayor and Council of the Borough
of Somerdale 2-10-2021 by Ord. No. 2021:01.[1] Amendments noted where applicable.]
[1]
Editor's Note: This ordinance also repealed former Ch 216,
Stormwater, adopted 3-13-2006 by Ord. No. 2006:08.
A.
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. It is the purpose of this article to establish minimum stormwater management requirements and controls for major development, as defined in § 216-2 of this article.
B.
Applicability.
C.
Development approvals issued for subdivisions and site plans pursuant
to this article are to be considered an integral part of development
approvals under the subdivision and site plan review process 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.
D.
This article is not intended to interfere with, abrogate, or annual
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.
A.
Unless specifically defined below, words or phrases used in this
article shall be interpreted so as to give them the meanings they
have in common usage and to give this article its most reasonable
application. 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.
B.
CAFRA CENTERS, CORES, OR NODES
CAFRA PLANNING MAP
COMMUNITY BASIN
COMPACTION
CONTRIBUTORY DRAINAGE AREA
CORE
COUNTY REVIEW AGENCY
DEPARTMENT
DESIGN ENGINEER
DESIGNATED CENTER
DEVELOPMENT
DISTURBANCE
DRAINAGE AREA
EMPOWERMENT NEIGHBORHOOD
ENVIRONMENTALLY CONSTRAINED AREAS
ENVIRONMENTALLY CRITICAL AREAS
EROSION
GREEN INFRASTRUCTURE
HUC 14 OR HYDROLOGIC UNIT CODE 14
IMPERVIOUS SURFACE
INFILTRATION
LEAD PLANNING AGENCY
MAJOR DEVELOPMENT
(1)
(2)
MOTOR VEHICLE
MOTOR VEHICLE SURFACE
MUNICIPALITY
NEW JERSEY STORMWATER BEST MANAGEMENT PRACTICES (BMPS) MANUAL
or BMP MANUAL
NODE
NUTRIENT
PERSON
POLLUTANT
RECHARGE
REGULATED IMPERVIOUS SURFACE
(1)
(2)
(3)
(4)
REGULATED MOTOR VEHICLE SURFACE
(1)
(2)
SEDIMENT
SITE
SOIL
STATE DEVELOPMENT AND REDEVELOPMENT PLAN METROPOLITAN PLANNING
AREA (PA1)
STATE PLAN POLICY MAP
STORMWATER
STORMWATER MANAGEMENT BASIN
STORMWATER MANAGEMENT MEASURE
STORMWATER MANAGEMENT PLANNING AGENCY
STORMWATER MANAGEMENT PLANNING AREA
STORMWATER RUNOFF
TIDAL FLOOD HAZARD AREA
URBAN COORDINATING COUNCIL EMPOWERMENT NEIGHBORHOOD
URBAN ENTERPRISE ZONES
URBAN REDEVELOPMENT AREA
WATER CONTROL STRUCTURE
WATERS OF THE STATE
WETLANDS OR WETLAND
As used in this article, the following terms shall have the meanings
indicated:
Those areas with boundaries incorporated by reference or
revised by the Department in accordance with N.J.A.C. 7:7-13.16.
The geographic depiction of the boundaries for Coastal Planning
Areas, CAFRA Centers, CAFRA Cores, and CAFRA Nodes pursuant to N.J.A.C.
7:7E-5B.3.
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 chapter.
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 Chosen Freeholders
to review municipal stormwater management plans and implementing ordinance(s).
The county review agency may either be:
The New Jersey 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, by any person,
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
lands, "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.
A neighborhood 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; habitat 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:
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 (1)(a), (b), (c), or (d) 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 chapter. 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 chapter. Alternative stormwater management measures, removal rates, or calculation methods may be utilized, subject to any limitations specified in this chapter, provided the design engineer demonstrates to the municipality, in accordance with § 216-4F of this chapter 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 chapter.
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, the The Borough of Somerdale or political subdivision
of the State of New Jersey, subject to municipal jurisdiction pursuant
to the Municipal Land Use Law, N.J.S.A. 40:55D-1 et seq.
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 basin may either
be normally dry (that is, a detention basin or infiltration basin),
retain water in a permanent pool (a retention basin), or be planted
mainly with wetland vegetation (most constructed stormwater wetlands).
Any structural or nonstructural strategy, 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 or ground water, 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 developed to meet the erosion control, groundwater recharge, stormwater runoff quantity, and stormwater runoff quality standards in § 216-4 of this article. To the maximum extent practicable, these standards shall be met by incorporating green infrastructure best management practices (GI BMPs), stormwater management measures, and nonstructural stormwater management strategies into the design. If these strategies alone are not sufficient to meet these standards, structural stormwater management measures necessary to meet these standards shall be incorporated into the design.
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, which
provide at least as much protection from stormwater-related loss of
groundwater recharge, stormwater quantity, and water quality impacts
of major development projects as would be provided under the standards
in N.J.A.C. 7:8-5, 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 § 216-10 of this article.
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 muhlnebergii (bog turtle).
C.
The following linear development projects are exempt from the groundwater recharge, stormwater runoff quantity, and stormwater runoff quality requirements of § 216-4P and Q of this article:
(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 groundwater recharge, stormwater runoff quantity, and stormwater runoff quality requirements of § 216-4F and G of this article 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;
(2)
The applicant demonstrates through an alternatives analysis that, through the use of green infrastructure, nonstructural, and structural stormwater management strategies and measures, the option selected complies with the requirements of § 216-4P and Q of this article to the maximum extent practicable;
(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 Subsection D(3), above, within the upstream drainage area of the receiving stream, that would provide additional opportunities to mitigate the requirements of § 216-4P and Q of this article that were not achievable on-site.
E.
Green infrastructure stormwater strategies. 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 § 216-4O, 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 chapter 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 under 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 (a) through (g) are found under 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 § 216-4O(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 § 216-2;
|
(h)
|
Manufactured treatment devices that do not meet the definition of green infrastructure at § 216-2.
|
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 § 216-6B. Alternative stormwater management measures may be used to satisfy the requirements at § 216-4O only if the measures meet the definition of green infrastructure at § 216-2. 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 § 216-4D is granted from § 216-4O.
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 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 § 216-8C;
(3)
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;
(4)
Stormwater management BMPs shall be designed to meet the minimum safety standards for stormwater management BMPs at § 216-8; and
(5)
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 section, 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 § 216-2 may be used only under the circumstances described at § 216-4O(4).
K.
Any application for a new agricultural development that meets the definition of major development at § 216-2 shall be submitted to the Soil Conservation District for review and approval in accordance with the requirements at § 216-4O, 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 § 216-4P, 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 in the Office of the 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 § 216-4O, 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 § 216-10B(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 § 216-4 of this chapter 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 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 § 216-4P and Q, the design engineer shall utilize green infrastructure BMPs identified in Table 1 at § 216-4F and/or an alternative stormwater management measure approved in accordance with § 216-4G. The following green infrastructure BMPs:
Best Management Practice
|
Maximum Contributory Drainage Area
|
---|---|
Dry well
|
1 acre
|
Manufactured treatment device
|
2.5 acres
|
Pervious pavement systems
|
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
|
(3)
To satisfy the stormwater runoff quantity standards at § 216-4R, the design engineer shall utilize BMPs from Table 1 or from Table 2 and/or an alternative stormwater management measure approved in accordance with § 216-4G.
(4)
If a variance in accordance with N.J.A.C. 7:8-4.6 or a waiver from strict compliance in accordance with § 216-4D 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 § 216-4G may be used to meet the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at § 216-4P, 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 § 216-4P, Q and R, unless the project is granted a waiver from strict compliance in accordance with § 216-4D.
P.
Erosion control, groundwater recharge and runoff quantity standards.
This subsection contains minimum design and performance standards
to control erosion, encourage and control infiltration and groundwater
recharge, and control stormwater runoff quantity impacts of major
development.
(1)
The minimum design and performance standards for erosion control
are those established under the Soil Erosion and Sediment Control
Act, N.J.S.A. 4:24-39 et seq. and implementing rules.
(2)
The minimum design and performance standards for groundwater recharge
shall be met by incorporating green infrastructure (GI), and are as
follows:
(a)
The design engineer shall, using the assumptions and factors for stormwater runoff and groundwater recharge calculations at § 216-5, either:
[1]
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
[2]
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.
(b)
This groundwater recharge requirement does not apply to projects
within the urban redevelopment area, or to projects subject to Subsection
F(2)(c) below.
(c)
The following types of stormwater shall not be recharged:
[1]
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 (USEPA) at 40 CFR 302.4; areas where recharge would
be inconsistent with a 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
[2]
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.
(d)
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 and
other subsurface structures in the vicinity or downgradient of the
groundwater recharge area.
(3)
In order to control stormwater runoff quantity impacts, the design engineer shall, using the assumptions and factors for stormwater runoff calculations at § 216-5 of this article, 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. The percentages
shall not be applied to post-construction stormwater runoff into tidal
flood hazard areas, if the increased volume of stormwater runoff will
not increase flood damages below the point of discharge; or
[1]
Any application for a new agricultural development that meets the definition of "major development" at § 216-2 shall be submitted to the appropriate Soil Conservation District for review and approval in accordance with the requirements of this section and any applicable Soil Conservation District guidelines for stormwater.
(d)
In tidal flood hazard areas, stormwater runoff quantity analysis
in accordance with Subsection F(3)(a), (b) and (c) above shall only
be applied if the increased volume of Stormwater runoff, change in
timing, or increased rate of stormwater runoff could increase flood
damages below the point of discharge. There is no analysis required
if the stormwater is discharged directly into any ocean, bay, inlet,
or reach of any watercourse between its confluence with any ocean,
bay, or inlet, and downstream of the first water control structure.
Q.
Stormwater runoff quality standards.
(1)
Stormwater management measures shall be designed to reduce the post-construction
load of total suspended solids (TSS) in stormwater runoff by 80% of
the anticipated load from the developed site, expressed as an annual
average. Stormwater management measures shall only be required for
water quality control if an additional 1/4 acre of regulated motor
vehicle impervious surface is being proposed on a development site.
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.
(2)
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 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.
(3)
Water quality calculations shall take into account the distribution
of rain from the water quality design storm, as reflected in Table
4. The calculation of the volume of runoff may take into account the
implementation of nonstructural and structural stormwater management
measures.
Table 4
| |||
---|---|---|---|
Water Quality Design Storm Distribution
| |||
Time
(minutes)
|
Cumulative Rainfall
(inches)
|
Time
(minutes)
|
Cumulative Rainfall
(inches)
|
0
|
0.0000
|
65
|
0.8917
|
5
|
0.0083
|
70
|
0.9917
|
10
|
0.0166
|
75
|
1.0500
|
15
|
0.0250
|
80
|
1.0840
|
20
|
0.0500
|
85
|
1.1170
|
25
|
0.0750
|
90
|
1.1500
|
30
|
0.1000
|
95
|
1.1750
|
35
|
0.1330
|
100
|
1.2000
|
40
|
0.1660
|
105
|
1.2250
|
45
|
0.2000
|
110
|
1.2334
|
50
|
0.2583
|
115
|
1.2417
|
55
|
0.3583
|
120
|
1.2500
|
60
|
0.6250
|
(4)
For purposes of TSS reduction calculations, Table 5, below, presents the presumed removal rates for certain BMPs designed in accordance with the New Jersey Stormwater Best Management Practices Manual, and TSS reduction shall be calculated based on the removal rates listed for the BMPs in Table 5. The BMP Manual may be obtained from the address identified in § 216-7 of this article, or found on the Department's website at www.njstormwater.org. The BMP Manual and other sources of technical guidance are listed in § 216-7 of this article. Alternative removal rates and methods of calculating removal rates may be used if the design engineer provides documentation demonstrating the capability of these alternative rates and methods to the review agency. A copy of any approved alternative rate or method of calculating the removal rate shall be provided to the Department at the following address: Division of Watershed Management, New Jersey Department of Environmental Protection, PO Box 418, Trenton, New Jersey 08625-0418.
(5)
If more than one BMP in series is necessary to achieve the required
TSS reduction of 80% 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.
|
Table 5
| |
---|---|
TSS Removal Rates for BMPs
| |
Best Management Practice
|
TSS Percent Removal Rate
|
Bioretention systems
|
80% to 90%
|
Constructed stormwater wetland
|
90%
|
*Extended detention basin
|
40% to 60%
|
Infiltration structure
|
80%
|
*Manufactured treatment device
|
50% to 80%
|
*Sand filter
|
80%
|
Vegetative filter strip
|
60% to 80%
|
*Wet pond
|
50% to 90%
|
*These BMPs will now require a waiver or variance to implement
|
(6)
If there is more than one on-site drainage area, the TSS removal
rate of 80% shall apply to each drainage area, unless the runoff from
the subareas converge on site, in which case the removal rate can
be demonstrated through a calculation using a weighted average.
(7)
Stormwater management measures shall also be designed to reduce, to the maximum extent feasible, the post-construction nutrient load of the anticipated load from the developed site in stormwater runoff generated from the water quality design storm. In achieving reduction of nutrients to the maximum extent feasible, the design of the site shall include nonstructural strategies and structural measures that optimize nutrient removal, while still achieving the performance standards in § 216-4P and Q of this article.
(8)
Additional information and examples are contained in the New Jersey Stormwater Best Management Practices Manual, which may be obtained from the address identified in § 216-7 of this article.
(9)
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.
(10)
Special water resource protection areas shall be established
along all waters designated Category One at N.J.A.C. 7:9B, and perennial
or intermittent streams that drain into or upstream of the Category
One waters as shown on the USGS Quadrangle Maps or in the County Soil
Surveys, within the associated HUC14 drainage area. These areas shall
be established for the protection of water quality, aesthetic value,
exceptional ecological significance, exceptional recreational significance,
exceptional water supply significance, and exceptional fisheries significance
of those established Category One waters. These areas shall be designated
and protected as follows:
(a)
The applicant shall preserve and maintain a special water resource
protection area in accordance with one of the following:
[1]
A 300-foot special water resource protection area shall be provided
on each side of the waterway, measured perpendicular to the waterway
from the top of the bank outwards or from the center line of the waterway
where the bank is not defined, consisting of existing vegetation or
vegetation allowed to follow natural succession.
[2]
Encroachment within the designated special water resource protection area under Subsection Q(10)(a)[1] above shall only be allowed where previous development or disturbance has occurred (for example, active agricultural use, parking area, or maintained lawn area). The encroachment shall only be allowed where the applicant demonstrates that the functional value and overall condition of the special water resource protection area will be maintained to the maximum extent practicable. In no case shall the remaining special water resource protection area be reduced to less than 150 feet as measured perpendicular to the top of bank of the waterway or center line of the waterway where the bank is undefined. All encroachments proposed under this subsection shall be subject to review and approval by the Department.
(b)
All stormwater shall be discharged outside of and flow through
the special water resource protection area and shall comply with the
standard for off-site stability in the Standards For Soil Erosion
and Sediment Control in New Jersey, established under the Soil Erosion
and Sediment Control Act, N.J.S.A. 4:24-39 et seq.
(c)
If stormwater discharged outside of and flowing through the
special water resource protection area cannot comply with the standard
for off-site stability in the Standards for Soil Erosion and Sediment
Control in New Jersey, established under the Soil Erosion and Sediment
Control Act, N.J.S.A. 4:24-39 et seq., then the stabilization measures
in accordance with the requirements of the above standards may be
placed within the special water resource protection area, provided
that:
[1]
Stabilization measures shall not be placed within 150 feet of
the Category One waterway;
[2]
Stormwater associated with discharges allowed by this section
shall achieve a TSS post-construction removal rate of 95%;
[3]
Temperature shall be addressed to ensure no impact on the receiving
waterway;
[4]
The encroachment shall only be allowed where the applicant demonstrates
that the functional value and overall condition of the special water
resource protection area will be maintained to the maximum extent
practicable;
[5]
A conceptual project design meeting shall be held with the appropriate
Department staff and Soil Conservation District staff to identify
necessary stabilization measures; and
[6]
All encroachments proposed under this section shall be subject
to review and approval by the Department.
(d)
A stream corridor protection plan may be developed by a regional stormwater management planning committee as an element of a regional stormwater management plan, or by a municipality through an adopted municipal stormwater management plan. If a stream corridor protection plan for a waterway subject to § 216-4Q(10) has been approved by the New Jersey Department of Environmental Protection, then the provisions of the plan shall be the applicable special water resource protection area requirements for that waterway. A stream corridor protection plan for a waterway subject to § 216-4Q(10) shall maintain or enhance the current functional value and overall condition of the special water resource protection area as defined in § 216-4Q(10)(a)[1] above. In no case shall a stream corridor protection plan allow the reduction of the special water resource protection area to less than 150 feet as measured perpendicular to the waterway subject to this subsection.
(e)
Section 216-4Q(10) does not apply to the construction of one individual single-family dwelling that is not part of a larger development on a lot receiving preliminary or final subdivision approval on or before December 3, 2018, and that the motor vehicle surfaces are made up of permeable material(s) such as gravel, dirt, and/or shells.
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 the NRCS National Engineering Handbook, Section 4,
Hydrology and Technical Release 55, Urban Hydrology for Small Watersheds;
or
(b)
The Rational Method for peak flow and the Modified Rational
Method for hydrograph computations.
(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 at § 216-5A(1)(a), above, and the Rational and Modified Rational Methods at § 216-5A(1)(b), above. 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).
(3)
In computing preconstruction 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
preconstruction stormwater runoff rates and volumes.
(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, and 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 http://www.state.nj.us/dep/njgs/; or at New Jersey
Geological Survey, 29 Artic Parkway, PO Box 427, Trenton, New Jersey
08625-0427; (609) 984-6587.
Site design features identified under § 216-4F above, or alternative designs in accordance with § 216-4G above, to prevent discharge of trash and debris from drainage systems shall comply with the following standard to control passage of solid and floatable materials through storm drain inlets. For purposes of this subsection, "solid and floatable materials" means sediment, debris, trash, and other floating, suspended, or settleable solids. For exemptions to this standard see § 216-7B below.
A.
Grates.
(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.
(2)
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.
(3)
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.
B.
The standard in Subsection A above does not apply:
(1)
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;
(2)
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;
(3)
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:
(4)
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].
(5)
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
(6)
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.
Technical guidance for stormwater management measures can be found at the department website below, or in the documents listed at § 216-7A(1) and (2), below, which are available from Maps and Publications, New Jersey Department of Environmental Protection, 428 East State Street, PO Box 420, Trenton, New Jersey 08625; telephone (609) 777-1038. 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. Information is provided on stormwater management measures such as, but not limited to, those listed in Tables 1, 2, and 3 in § 216-4.
(2)
The New Jersey Department of Environmental Protection Stormwater
Management Facilities Maintenance Manual, as amended, found at the
website below. 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.
C.
Additional technical guidance for stormwater management measures
can be obtained from the following:
(1)
The Standards for Soil Erosion and Sediment Control in New Jersey
promulgated by the State Soil Conservation Committee and incorporated
into N.J.A.C. 2:90. Copies of these standards may be obtained by contacting
the State Soil Conservation Committee or any of the Soil Conservation
Districts listed in N.J.A.C. 2:90-1.3(a)4. The location, address,
and telephone number of each Soil Conservation District may be obtained
from the State Soil Conservation Committee, PO Box 330, Trenton, New
Jersey 08625; (609) 292-5540;
(2)
The Rutgers Cooperative Extension Service, 732-932-9306; and
(3)
The Soil Conservation Districts listed in N.J.A.C. 2:90-1.3(a)4.
The location, address, and telephone number of each Soil Conservation
District may be obtained from the State Soil Conservation Committee,
PO Box 330, Trenton, New Jersey 08625; (609) 292-5540.
A.
This section sets forth requirements to protect public safety through the proper design and operation of stormwater management basins. This section applies to any new stormwater management basin. However, the provisions of this section are not intended to preempt more stringent municipal or county safety requirements for new or existing stormwater management basins. Municipal and county stormwater management plans and ordinances may, pursuant to their authority, require existing stormwater management basins to be retrofitted to meet one or more of the safety standards in § 216-8B(1), and (3) for trash racks, overflow grates, and escape provisions at outlet structures.
B.
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 basin to
ensure proper functioning of the basin 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.
(d)
The trash rack shall be constructed and installed to be rigid,
durable, and corrosion-resistant, and shall be designed to withstand
a perpendicular live loading of 300 psf.
(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 psf.
(3)
For purposes of this Subsection B(3), escape provisions means the permanent installation of ladders, steps, rungs, or other features that provide easily accessible means of egress from stormwater management basins. Stormwater management basins shall include escape provisions as follows:
(a)
If a stormwater management basin has an outlet structure, escape provisions shall be incorporated in or on the structure. With the prior approval of the reviewing agency identified in § 216-8C, 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 basins having a permanent pool of water deeper than 2 1/2 feet. Such 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 § 216-8D, below, for an illustration of safety ledges in a stormwater management basin.
(c)
In new stormwater management basins, the maximum interior slope
for an earthen dam, embankment, or berm shall not be steeper than
three horizontal to one vertical.
C.
Variance or exemption from safety standards. A variance or exemption
from the safety standards for stormwater management basins may be
granted only upon a written finding by the appropriate reviewing agency
(municipality, county, or Department) that the variance or exemption
will not constitute a threat to public safety.
(1)
In order to grant a variance from the stormwater management measures
set forth in its approved municipal stormwater management plan and
stormwater control ordinances, include a mitigation plan that identifies
what measures are necessary potential mitigation projects, and/or
criteria to evaluate mitigation projects that can be used to offset
the deficit by granting a variance in accordance with N.J.A.C. 7:8-4.6.
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 § 216-9C, below, as part of the submission of the applicant's application for subdivision or site plan 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 subdivision
or site plan review process by the municipal board or official from
which municipal approval is sought. That municipal board or official
shall consult the engineer retained by the Planning and/or Zoning
Board (as appropriate) to determine if all of the checklist requirements
have been satisfied and to determine if the project meets the standards
set forth in this article.
C.
Checklist requirements. 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,
areas of potential soil erosion, perennial or intermittent streams
that drain into or upstream of the Category One waters, wetlands and
floodplains (with their appropriate transition area buffers), marshlands,
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 environs. 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 plan(s): 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 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 of proposed
changes in natural conditions should also be provided.
(4)
Land use planning and source control plan. This plan shall provide a demonstration of how the goals and standards of § 216-3 through § 216-6 of this article 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 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 postdevelopment conditions for the design storms specified in § 216-4 of this article.
(b)
When the proposed stormwater management control measures (e.g.,
infiltration basins) depend on the hydrologic properties of soils,
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 § 216-10 of this article.
(8)
Waiver from submission requirements. The municipal official or board reviewing an application under this article may, in consultation with the municipal engineer, waive submission of any of the requirements in § 216-9C(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.
A.
Applicability. Projects subject to review as in § 216-1C of this article shall comply with the requirements of § 216-10B and C. In addition to normal required performance and maintenance bonds, the developer is required to post a two-year guarantee for preventive and corrective maintenance of the stormwater management measures in accordance with N.J.S.A. 40:55D-53.
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). Maintenance guidelines for stormwater
management measures are available in the New Jersey Stormwater Best
Management Practices Manual. If the maintenance plan identifies a
person other than the developer (for example, a public agency or homeowners'
association) as having the responsibility for maintenance, the plan
shall include documentation of such person's agreement to assume
this responsibility, or of the developer's obligation to dedicate
a stormwater management facility to such person under an applicable
ordinance or regulation.
(3)
If the maintenance plan identifies a person other that the owner
as having responsibility for maintenance that plan shall include documentation
of such person's or entity's agreement to assume 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.
(5)
If the person responsible for maintenance identified under § 216-10B(2), above, is not a public agency, the maintenance plan and any future revisions based on § 216-10B(8) 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 function of the stormwater management measure, including repairs
or replacement to the structure; removal of sediment, debris, or trash;
restoration of eroded areas; snow and ice removal; fence repair or
replacement; restoration of vegetation; and repair or replacement
of nonvegetated linings.
(7)
The person responsible for maintenance identified under § 216-10B(2), above, shall maintain a detailed log of all preventative and corrective maintenance for the structural stormwater management measures incorporated into the design of the development, including a record of all inspections and copies of all maintenance-related work orders.
(8)
The person responsible for maintenance identified under § 216-10B(2), above, shall evaluate the effectiveness of the maintenance plan at least once per year and adjust the plan and the deed as needed.
(9)
The person responsible for maintenance identified under § 216-10B(2), above, shall retain and make available, upon request by any public entity with administrative, health, environmental, or safety authority over the site, the maintenance plan and the documentation required by § 216-10B(7) and (8), above.
(10)
The requirements of § 216-10B(4) and (5) do not apply to stormwater management facilities that are dedicated to and accepted by the municipality or another governmental agency. The owners of stormwater management facilities which are privately owned shall fund or otherwise guarantee the maintenance and inspection program for a period of no less than 10 years. The program shall identify the entity which is responsible for the requirements for maintenance and action to be taken by the municipality for failure of said maintenance, inspection process by the Borough and method to finance the program. The Borough shall reserve the right to require the renewal of the program for a period of time determined by the Borough.
(11)
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.
C.
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.
Any person who erects, constructs, alters, repairs, converts,
maintains, or uses any building, structure or land in violation of
this chapter shall be subject to the following penalties: 15% of the
corrective construction cost, said cost as determined by the Borough
Engineer, but not less than $500 per violation.
This chapter shall take effect immediately upon approval by
the county review agency or 60 days from the receipt of the ordinance
by the county review agency if the county review agency should fail
to act.
If the provisions of any section, subsection, paragraph, subdivision,
or clause of this chapter shall be judged invalid by a court of competent
jurisdiction, such order of judgment shall not affect or invalidate
the remainder of any section, subsection, paragraph, subdivision,
or clause of this chapter.