The subdivider shall observe the following requirements
and principles of land subdivision in the design of each subdivision
or portion thereof:
A.
Development pattern. The subdivision plat shall conform
to design standards that will encourage the most appropriate development
pattern within the Township.
B.
Reservation of public areas.
(1)
If the Master Plan or the Official Map provides for
the reservation of designated streets, public drainageways, flood
control basins, or public areas within the proposed development, before
approving a subdivision the Planning Board may further require that
such streets, ways, basins or areas be shown on the plat in locations
and sizes suitable to their intended uses. The Planning Board may
reserve the location and extent of such streets, ways, basins or areas
shown on the plat for a period of one year after the approval of the
final plat or within such further time as may be agreed to by the
developer. Unless during such period or extension thereof the Township
shall have entered into a contract to purchase or institute condemnation
proceedings according to law for the fee or a lesser interest in the
land comprising such streets, ways, basins or areas, the developer
shall not be bound by such reservation shown on the plat and may proceed
to use such land for private use in accordance with applicable development
regulations. The provisions of this section shall not apply to the
streets and roads, flood control basins or public drainageways necessitated
by the subdivision or land development and required for final approval.
(2)
The developer shall be entitled to just compensation
for actual loss found to be caused by such temporary reservation and
deprivation of use. In such instance, unless a lesser amount has previously
been mutually agreed upon, just compensation shall be deemed to be
the fair market value of an option to purchase the land reserved for
the period of reservation; provided that determination of such fair
market value shall include, but not be limited to, consideration of
the real property taxes apportioned to the land reserved and prorated
for the period of reservation. The developer shall be compensated
for the reasonable increased cost of legal, engineering, or other
professional services incurred in connection with obtaining subdivision
approval or site plan approval, as the case may be, caused by the
reservation.
[Amended by Ord. No. 7-1984; Ord. No. 19-1987; Ord. No. 5-1991]
A.
General. The arrangement of streets and roads not
shown on the Master Plan or Official Map shall be such as to provide
for the appropriate extension of existing streets and, where necessary
in order to promote the orderly flow of traffic, and for the safety,
welfare and convenience of the public, shall be such as to provide
for the appropriate extensions to adjoining properties.
B.
Road and access requirements.
(2)
Subdivision on private roads or driftways and not
qualifying as a flag lot.
(a)
Any proposed subdivision on an existing private
road or driftway shall not be approved until the private road or driftway
is improved to Class III common driveway standards. In the event the
private road or driftway cannot be improved to Class III common driveway
standards, the Planning Board shall reject the proposed subdivision
unless the applicant submits alternate plans which adhere as closely
to Class III common driveway standards as practical and which assures
the Planning Board that adequate access to the proposed subdivision
shall be available at all times throughout the year.
(b)
The plans for Class III common driveway or alternate
road standard shall be approved by the Township Engineer prior to
subdivision approval. The Class III common driveways or alternate
road improvement shall be installed prior to the issuance of a building
permit.
(c)
The applicant shall also submit proof or evidence
that he has legal use and access, and the right to improve the private
road or driftway.
(3)
Flag lots.
(a)
Subdivision of land not presently fronting on
a Township, county or state road may be approved by the Planning Board,
providing the following standards are met:
(b)
All private access roads to be created shall
connect with the parcel proposed to be subdivided and a Township,
county, or state road, or a Class II or Class III common driveway
which has been improved to the specifications of the Township regulations.
(c)
Each flag lot created pursuant to this chapter
shall have its own private access road in accordance with the standards
expressed herein and shall not be closer than 300 feet to another
flag lot access road.
C.
Widening existing roads. Subdivisions that include or abut existing roads which do not conform to right-of-way widths as shown on the Master Plan or Official Map, or as required by Chapter 325, Article IV, Street Construction Standards, shall dedicate the additional width from the center line of the road abutting the property being subdivided. If the subdivision adjoins one side of an existing road which does not meet standards, only 1/2 of the required extra width shall be dedicated. The Planning Board shall waive the dedication if it results in buildings or structures encroaching in the right-of-way. Any area dedicated for right-of-way shall be included as part of the minimum lot area requirement.
D.
Names of roads. Streets and roads shall not have a
name which will duplicate or so nearly duplicate as to be confused
with the names of existing streets. The continuation of an existing
street shall have the same name. The names of all new streets shall
be approved by the Township Committee.
E.
Cul-de-sac. The Planning Board may require a cul-de-sac
in excess of 2,000 feet to be designed where physically feasible,
to permit the potential extension of a cul-de-sac to an adjoining
property for the purpose of creating a second means of access in the
future. The Planning Board may limit the length of a cul-de-sac where
conditions of excessive slope or other environmental conditions are
found, which would restrict emergency access. Midway turning circles,
wide enough to accommodate all emergency vehicles, may be required
at intervals of 1,200 feet.
A.
General. Block length and width or acreage within bounding roads shall be such as to accommodate the size of the lot required in the area by Chapter 400, Zoning, and to provide adequately for sewage disposal, convenient access, circulation, control and safety of street traffic.
B.
Easements. Rights-of-way easements and walks may be
required within blocks for purposes of circulation and utility placement.
[Amended by Ord. No. 7-1984; Ord. No. 5-1991]
A.
General. Lot dimensions, front, side and rear yards and total area in square feet shall not be less than the requirements of Chapter 400, Zoning.
B.
Side lines. Insofar as is practical, side lot lines
shall be at right angles to streets and radial to curved streets.
C.
Frontage. Each building lot must front upon a public road or Class III common driveway, and the frontage shall not be less than the requirements of Chapter 400, Zoning.
D.
Setbacks. Where land has been dedicated for a widening
of existing streets, lots shall begin at such new street line as may
have been established, and all setbacks shall be measured from such
line.
E.
Substandard suitability. Where there is a question
of the suitability of a lot or lots for their intended use due to
factors such as rock formations, flood conditions, high water table,
sewage disposal, excessive topographic slope or similar circumstances,
the Planning Board may, after adequate investigation, with professional
assistance, if deemed necessary, withhold approval of such lots.
F.
Driveways.
(1)
Driveways shall not have a grade in excess of 15%
over the entire length and not more than 2% for the first 25 feet
from the road unless otherwise approved by the Planning Board. Driveways
shall not be located where visibility is limited because of curves,
topography, etc.
(2)
Driveways intersecting the right-of-way of any county
road shall meet the requirements of the County of Hunterdon, and an
approved driveway permit from the county shall be a condition of a
building permit.
G.
Lots on arterial or collector streets. Lots fronting
on arterial or collector roads shall, at the discretion of the Planning
Board, be serviced by a marginal access road or reverse frontage,
or be required to provide driveways with turnarounds.
[Amended by Ord. No. 7-1984]
A.
Utility easements. In any major subdivision, or where
unusual circumstances warrant, as determined by the Planning Board,
easements may be required for utility installations. Such easements
shall be at least 20 feet wide and located after consultation with
the utility companies or Township agencies concerned.
B.
Drainage and conservation easements. Where a subdivision
is traversed by a watercourse, drainageway, channel or stream, or
where it is desirable to preserve other areas within a subdivision
because of soil conditions, rock outcroppings, tree masses, wildlife
habitat, vistas, or other significant horticultural, environmental
or natural features, there shall be provided a drainage and/or conservation
easement of sufficient area and width to protect and preserve the
aforementioned features. Such easements shall be deeded to the Township
prior to final subdivision approval and carry the following limitations:
(1)
No trees or shrubs shall be removed or destroyed on
lands in the easement except in accordance with approved forest management
practices.
(2)
No topsoil, sand, gravel, or minerals shall be excavated
or removed, except as may be required to build a pond, and then only
if the Township approves the design and structure of the pond, it
being the intent to preserve the natural function of the floodplain.
(3)
No buildings or any description shall be erected.
(4)
No fill of any kind shall be permitted, except as
may be required to build a road, and then only after the Township
approves the design.
C.
Underground utilities.
(1)
In all major subdivisions, all utility distribution
lines or mains and all services shall be installed underground. In
all such subdivisions, the applicant shall arrange with the serving
utility for the underground installation if the utilities' distribution
supply lines, in accordance with the provisions of the applicable
standard terms and conditions incorporated as a part of its tariff,
as the same are then on file with the State of New Jersey Board of
Public Utility Commissioners, and shall submit to the Planning Board
prior to the granting of final approval a written instrument from
each serving utility which shall evidence full compliance with the
provisions of this subsection; except, however, that lots which, in
such subdivision, abut existing streets where overhead electric, cable
television or telephone distribution supply lines have heretofore
been installed on any portion of the street involved, may be supplied
with such services from those overhead lines, but the service connections
from the utilities' overhead lines shall be installed underground.
(2)
In any particular situation where the applicant can
clearly demonstrate that, because of unusual topographic conditions
or other unusual conditions having to do with the land, the installation
of such utilities underground is impracticable or otherwise not feasible
due to such conditions, then the Planning Board, in its discretion,
may waive this requirement for underground installation.
(3)
All underground utility work which will be under the
pavement of the street shall be laid sufficiently in advance to allow
for complete settlement of the trenches, and in no event shall construction
work be permitted over such excavation which, in the opinion of the
Township Engineer, has not properly settled.
D.
Setback from streams and other bodies of water. No
structure or improvements shall be built closer to the mean high water
mark of a stream or watercourse than 10 feet plus three feet for each
foot of stream width, or 10 feet from the high water mark of an established
floodplain, whichever is greater. Stream setbacks may be included
in any front, rear or side yard requirement.
Measures used to control erosion and reduce
sedimentation shall as a minimum meet the standards, specifications,
and recommendations of the Hunterdon County Soil Conservation District
and the Soil Erosion and Sediment Control Act (N.J.S.A. 4:24-39 et
seq.).
All requirements of Chapter 220, Flood Drainage Prevention, shall apply to all subdivisions.
[Added 5-3-2006 by Ord. No. 2006-06;
amended 12-18-2019 by Ord. No.
2019-10; 5-5-2021 by Ord. No. 2021-04]
A.
Scope and purpose.
(1)
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.
(2)
Purpose. The purpose of this section is to establish minimum stormwater management requirements and controls for major development and minor development, as defined below in Subsection B.
(3)
Applicability.
(a)
This section shall be applicable to the following major and
minor developments:
[1]
Any major development that requires preliminary or final site
plan approval or subdivision approval; and
[2]
Nonresidential major developments; and
[3]
Nonresidential minor development that involves 5,000 square
feet of new impervious surface or disturbs more than 1/2 acre; and
[4]
Aspects of residential major developments that are not preempted
by the Residential Site Improvement Standards at N.J.A.C. 5:21.
(b)
This section shall also be applicable to all major developments
undertaken by the Township of Lebanon.
(4)
Compatibility with other permit and ordinance requirements. Development
approvals issued pursuant to this section 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 section
shall be held to be the minimum requirements for the promotion of
the public health, safety, and general welfare. This section 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 section 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.
B.
CAFRA CENTERS, CORES OR NODES
CAFRA PLANNING MAP
CARBONATE ROCK AREA
COMMUNITY BASIN
COMPACTION
CONTRIBUTORY DRAINAGE AREA
CORE
COUNTY REVIEW AGENCY
CURRENT DEFICIT AREA
DEPARTMENT
DESIGN ENGINEER
DESIGNATED CENTER
DEVELOPMENT
DISTURBANCE
DRAINAGE AREA
ENVIRONMENTALLY CONSTRAINED AREA
ENVIRONMENTALLY CRITICAL AREA
ENVIRONMENTALLY SENSITIVE PLANNING AREA
EROSION
GREEN INFRASTRUCTURE
HUC 14 or HYDROLOGIC UNIT CODE 14
IMPERVIOUS SURFACE
INFILTRATION
LEAD PLANNING AGENCY
MAJOR DEVELOPMENT
(1)
(a)
(b)
(c)
(d)
(2)
MINOR DEVELOPMENT
MITIGATION
MOTOR VEHICLE
MOTOR VEHICLE SURFACE
MUNICIPALITY
NEW JERSEY STORMWATER BEST MANAGEMENT PRACTICES (BMP) MANUAL
or BMP MANUAL
NODE
NONEXEMPT PROJECT
NUTRIENT
PERSON
POLLUTANT
PRIME GROUNDWATER RECHARGE AREA
RECHARGE
REGIONAL MASTER PLAN
REGULATED IMPERVIOUS SURFACE
(1)
(2)
(3)
(4)
REGULATED MOTOR VEHICLE SURFACE
(1)
(2)
(3)
RIGHT TO FARM
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
RURAL PLANNING AREA
SEDIMENT
SITE
SOIL
STATE DEVELOPMENT AND REDEVELOPMENT PLAN RURAL/ENVIRONMENTALLY
SENSITIVE PLANNING AREA (PA4 AND PA5)
STATE PLAN POLICY MAP
STORMWATER
STORMWATER MANAGEMENT BMP
STORMWATER MANAGEMENT MEASURE
STORMWATER MANAGEMENT PLANNING AGENCY
STORMWATER MANAGEMENT PLANNING AREA
STORMWATER RUNOFF
TIDAL FLOOD HAZARD AREA
WATER CONTROL STRUCTURE
WATERS OF THE STATE
WETLANDS or WETLAND
Definitions. For the purpose of this section, the following terms,
phrases, words and their derivations shall have the meanings stated
herein unless their use in the text of this section 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. If not specifically defined below, words
or phrases used in this section shall be interpreted so as to give
them the meanings they have in common usage and to give this section
its most reasonable application.
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 area where rock consisting chiefly of calcium and magnesium
carbonates, such as limestone and dolomite, has been identified.
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 section.
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 Commissioners to review
municipal stormwater management plans and implementing ordinance(s).
The county review agency may either be:
Any United States Geological Survey fourteen-digit Hydrologic
Unit Code subwatershed area that is identified in the Highlands Regional
Master Plan as having negative net water availability, meaning that
existing consumptive and depletive water uses exceed the capacity
of the groundwater supply to sustain.
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, 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.
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.
An area that contains large contiguous land areas with valuable
ecosystems, geological features and wildlife habitats particularly
in the Delaware Bay and other estuary areas, the Highlands Region
and the Coastal Area. New Jersey's future environmental integrity
and a substantial portion of its economy depends on the protection
of these irreplaceable resources. Environmentally sensitive planning
areas are characterized by watersheds of pristine waters, trout streams
and drinking water supply reservoirs; aquifer recharge areas for potable
water supplies; habitats for endangered and threatened plant and animal
species, coastal and freshwater wetlands; prime forested areas; scenic
vistas and other significant topographical, geological or ecological
features, particularly coastal barrier spits and islands. These resources
are critically important not only for the local residents of these
areas, but for all New Jersey residents and tourists who may travel
great distances to visit these sites.
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.
Any structure, surface, or improvement that reduces or prevents
absorption of stormwater into land, and includes porous paving, paver
blocks, gravel, crushed stone, decks, patios, elevated structures,
and other similar structures, surfaces, or improvements. To be considered
an impervious surface, the structure, surface or improvement must
have the effect of reducing or preventing stormwater absorption.
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
A combination of Subsection B(1)(b) and (c) above that totals
an area of 1/4 acre or more. The same surface shall not be counted
twice when determining if the combination area equals 1/4 acre or
more.
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 B(2)(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.
Any nonresidential development that results in the creation
of 5,000 square feet, but less than 1/4 acre of new impervious area
or that disturbs more than 1/2 acre of land area, but less than 1
acre. Further, a minor development shall not meet the definition of
"major development."
An action by an applicant providing compensation or offset
actions for on-site stormwater management requirements where the applicant
has demonstrated the inability or impracticality of strict compliance
with the stormwater management requirements set forth in N.J.A.C.
7:8, in an adopted regional stormwater management plan, or in this
local ordinance, and has received a waiver from strict compliance
from the municipality. Mitigation shall include the implementation
of the approved mitigation plan within the same drainage area where
the subject project is proposed, or a contribution of funding toward
a municipal stormwater control project, or provision for equivalent
treatment at an alternate location, or any other equivalent water
quality benefit as approved by the municipality.
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 section. 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 section. Alternative stormwater management measures, removal rates, or calculation methods may be utilized, subject to any limitations specified in this section, provided the design engineer demonstrates to the municipality, in accordance with Subsection D(6) of this section 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 section.
An area designated by the State Planning Commission concentrating
facilities and activities which are not organized in a compact form.
Any project not eligible for an exemption from the Highlands
Water Protection and Planning Act Rules, pursuant to N.J.A.C. 7:38-2.3.
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.
Lands with the best groundwater recharge rates within a HUC14
subwatershed, as indicated by GSR-32 analysis, that provide the top
40% of the total recharge volume for the subwatershed.
The amount of water from precipitation that infiltrates into
the ground and is not evapotranspired.
The Highlands regional master plan or any revision thereof
adopted by the Highlands Water Protection and Planning Council pursuant
to N.J.S.A. 13:20-8.
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.
Includes, but is not limited to:
Use of irrigation pumps and equipment, aerial and ground seeding
and spraying, tractors and other equipment.
Use of necessary farm laborers.
The application of chemical fertilizers, insecticides and herbicides,
and the application of manure.
The grazing of animals and use of range for fowl, subject to
the standards and regulations for intensive fowl and livestock use.
Construction of fences for these animals and livestock.
The traveling and transportation of large, slow-moving equipment
over roads within the Township.
The control of vermin and pests, provided that such control
is practiced under applicable state fish and game laws.
The on-site disposal of organic agricultural wastes.
An area that comprises much of new jersey's countryside,
where large masses of cultivated or open land surround rural regional
centers, towns, villages and hamlets. Relatively isolated residential,
commercial and industrial sites are clearly distinguishable from typical
suburban development in this planning area. The open lands of this
rural planning area include most of New Jersey's prime farmland, which
has the greatest potential for sustaining continued agricultural production
in the future along with forested and woodland tracts. These areas
along with the Environmentally Sensitive Planning Area – Planning
Area 5, serve as the greensward for the larger region and are not
currently nor are they expected to be urban or suburban in nature
in the future. This classification also includes a subplanning area,
the Environmentally Sensitive/Rural Planning Area. The state plan
intent for this subplanning area is to support continued agricultural
development on lands with environmentally sensitive features.
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 agricultural production along with
forested and woodland tracts. The delineated environmentally sensitive
planning area (PA5) is not expected to be urban or suburban in nature
in the future.
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 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."
C.
Design and performance standards for stormwater management measures.
(1)
Stormwater management measures for minor development shall be designed
to include the following stormwater management measures:
(a)
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.
(b)
Seepage pits or other infiltration measures shall be provided
with a capacity of three inches of runoff for each square foot of
new impervious area. Stone used in the infiltration devices shall
be two-and-one-half-inch clean stone, and a design void ratio of 33%
shall be used. The infiltration measures shall be designed with an
overflow to the surface which shall be stabilized and directed to
an existing stormwater conveyance system or in a manner to keep the
overflow on the developed property to the greatest extent feasible.
If the new impervious surface is not roof area, an equivalent area
of existing roof may be directed to the infiltration system. This
shall be permitted where the existing roof is not already directed
to infiltration devices.
(2)
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:
(a)
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.
(b)
The minimum standards for groundwater recharge, stormwater quality,
and stormwater runoff quantity shall be met by incorporating green
infrastructure.
(3)
The standards in this section apply only to new minor and 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.
Note: Alternative standards shall 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.
(4)
For site improvements regulated under the Residential Site Improvement
Standards (RSIS) at N.J.A.C. 5:21, the RSIS shall apply in addition
to this section except to the extent the RSIS are superseded by this
section or alternative standards applicable under a regional stormwater
management plan or water quality management plan adopted in accordance
with Department rules.
D.
Stormwater management requirements for major development.
(1)
The development shall incorporate a maintenance plan for the stormwater management measures incorporated into the design of a major development in accordance with Subsection J.
(2)
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).
(3)
The following linear development projects are exempt from the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity requirements of Subsection D(16), (17) and (18):
(a)
The construction of an underground utility line, provided that
the disturbed areas are revegetated upon completion;
(b)
The construction of an aboveground utility line, provided that
the existing conditions are maintained to the maximum extent practicable;
and
(c)
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.
(4)
A waiver from strict compliance from the green infrastructure, groundwater recharge, stormwater runoff quality, and stormwater runoff quantity requirements of Subsection D(15), (16), (17) and (18) 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:
(a)
The applicant demonstrates that there is a public need for the
project that cannot be accomplished by any other means;
(d)
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(4)(c) above within the upstream drainage area of the receiving stream, that would provide additional opportunities to mitigate the requirements of Subsection D(15), (16), (17) and (18) that were not achievable on-site.
(5)
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 Subsection D(15), (16), (17) and (18). 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.
(6)
Where the BMP tables in the NJ Stormwater Management Rule are different
due to updates or amendments with the tables in this section, 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 Quantity 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 Table 1, 2, and 3:
| |
---|---|
(a)
|
Subject to the applicable contributory drainage area limitation specified at Subsection D(15)(b);
|
(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 Subsection B;
|
(h)
|
Manufactured treatment devices that do not meet the definition of "green infrastructure" at Subsection B.
|
(7)
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 Subsection F(2). Alternative stormwater management measures may be used to satisfy the requirements at Subsection D(15) only if the measures meet the definition of "green infrastructure" at Subsection B. Alternative stormwater management measures that function in a similar manner to a BMP listed at Subsection D(15)(b) are subject to the contributory drainage area limitation specified at Subsection D(15)(b) 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 D(15)(b) 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 Subsection D(4) is granted from Subsection D(15).
(8)
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.
(9)
Design standards for stormwater management measures are as follows:
(a)
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);
(b)
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 Subsection H(3);
(c)
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;
(d)
Stormwater management BMPs shall be designed to meet the minimum safety standards for stormwater management BMPs at Subsection H; and
(e)
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.
(10)
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 Subsection B may be used only under the circumstances described at Subsection D(15)(d).
(11)
Any application for a new agricultural development that meets the definition of "major development" at Subsection B shall be submitted to the soil conservation district for review and approval in accordance with the requirements at Subsection D(15), (16), (17) and (18) 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.
(12)
If there is more than one drainage area, the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at Subsection D(16), (17) and (18) 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.
(13)
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 Hunterdon 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 Subsection D(15), (16), (17) and (18) 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 Subsection J(2)(e). 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.
(14)
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 Subsection D of this section 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 Hunterdon 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 D(13) 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 D(13) above.
(15)
Green infrastructure standards.
(a)
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.
(b)
To satisfy the groundwater recharge and stormwater runoff quality standards at Subsection D(16) and (17), the design engineer shall utilize green infrastructure BMPs identified in Table 1 at Subsection D(6) and/or an alternative stormwater management measure approved in accordance with Subsection D(7). The following green infrastructure BMPs are subject to the following maximum contributory drainage area limitations:
Best Management Practice
|
Maximum Contributory Draiange 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
|
(d)
If a variance in accordance with N.J.A.C. 7:8-4.6 or a waiver from strict compliance in accordance with Subsection D(4) 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 Subsection D(7) may be used to meet the groundwater recharge, stormwater runoff quality, and stormwater runoff quantity standards at Subsection D(16), (17) and (18).
(e)
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 Subsection D(16), (17) and (18), unless the project is granted a waiver from strict compliance in accordance with Subsection D(4).
(16)
Groundwater recharge standards.
(a)
This subsection contains the minimum design and performance
standards for groundwater recharge as follows.
(b)
The design engineer shall, using the assumptions and factors for stormwater runoff and groundwater recharge calculations at Subsection E, 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.
(c)
Additional standards set forth in Subsection D(16)(c)[1] and [2] below may apply as required.
[1]
Nonexempt projects located in a current deficit areas. Where
the project is located in a current deficit area as identified in
Exhibit A,[1] the project shall demonstrate through hydrologic and hydraulic analysis that the site and its stormwater management measures provide for enhanced recharge standards set forth in Subsection D(16)(f) below.
[1]
Editor's Note: Exhibit B, Groundwater Recharge Areas, is included
as an attachment to this section.
[2]
Nonexempt projects located in a prime groundwater recharge area.
Where the project is located in a prime groundwater recharge area
as identified in Exhibit B,[2] the following standards shall apply:
[a]
Where disturbance is permitted in accordance with
this subsection, it shall be limited to no greater than 15% of the
prime groundwater recharge area on the site and shall preferentially
be sited on that portion of prime groundwater recharge area that has
the lowest groundwater recharge rates.
[2]
Editor's Note: Exhibit B, Groundwater Recharge Areas, is included
as an attachment to this section.
(d)
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 (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
[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.
[3]
Carbonate rock areas. Where surficial or subsurface karst features
have been identified and recharge facilities cannot be designed in
a manner that would eliminate the concentrated subsurface release
of stormwater. (Note: the mere presence of carbonate bedrock does
not constitute a karst feature.)
(e)
Enhanceds recharge standards. Nonexempt projects that are subject
to the enhanced recharge requirements by Subsection D(15)(c)[1] and
[2] above, shall apply the following standards, either:
[1]
Recharge 125% of the percentage of the average annual preconstruction
groundwater recharge volume for the site; or
[2]
In addition to complying with the recharge requirements of Subsection D(15), retain on-site with no discharge, the stormwater quality design volume (SWQDv), defined as the runoff from the 1.25-inch, two-hour rainfall event. Where meeting the recharge requirement will not result in retention of the full SWQDv, the major development shall retain any additional volume to meet the requirements of this section through additional infiltration, or through evapotranspiration or capture and on-site reuse of rainfall.
(f)
Mitigation required for nonexempt projects.
[1]
In lieu of on-site recharge, the applicant shall be responsible
for providing mitigation of the groundwater recharge volume in the
required amount. The applicant should provide mitigation within the
following areas, in order of priority:
[a]
The same development site where feasible;
[b]
The same HUC14 subwatershed; or
[c]
An interrelated HUC14 subwatershed where no feasible option
exists in the same HUC14 subwatershed.
If none of the above options are feasible or achievable, then the applicant shall comply with the mitigation requirements set forth in Subsection D(16)(f)[2].
|
[2]
A waiver from strict compliance with the requirements of the
Municipal Stormwater ordinance shall be approved by the municipality
only in those cases where an applicant has demonstrated the inability
to strictly comply with any standard of the municipal stormwater ordinance.
A waiver from strict compliance for such projects can only be obtained
if the applicant agrees to undertake a suitable mitigation measure
identified in the mitigation section of the municipality's stormwater
management plan. In such cases, the applicant must submit a mitigation
plan detailing how the project's failure to strictly comply will be
compensated. In cases where a waiver is granted, an applicant should
provide mitigation, if possible and/or practical, within the same
drainage area within which the subject project is proposed, or contribute
funding toward a municipal stormwater control project, or provide
for equivalent treatment at an alternate location, or provide for
another equivalent water quality benefit, in lieu of implementing
the required stormwater control measures on their specific site.
(17)
Stormwater runoff quality standards.
(a)
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.
(b)
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:
[1]
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.
[2]
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.
(c)
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 D(17)(b) 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.
(d)
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
|
0.00830
|
45
|
0.2000
|
85
|
1.1170
|
6
|
0.00996
|
46
|
0.2117
|
86
|
1.1236
|
7
|
0.01162
|
47
|
0.2233
|
87
|
1.1302
|
8
|
0.01328
|
48
|
0.2350
|
88
|
1.1368
|
9
|
0.01494
|
49
|
0.2466
|
89
|
1.1434
|
10
|
0.01660
|
50
|
0.2583
|
90
|
1.1500
|
11
|
0.01828
|
51
|
0.2783
|
91
|
1.1550
|
12
|
0.01996
|
52
|
0.2983
|
92
|
1.1600
|
13
|
0.02164
|
53
|
0.3183
|
93
|
1.1650
|
14
|
0.02332
|
54
|
0.3383
|
94
|
1.1700
|
15
|
0.02500
|
55
|
0.3583
|
95
|
1.1750
|
16
|
0.03000
|
56
|
0.4116
|
96
|
1.1800
|
17
|
0.03500
|
57
|
0.4650
|
97
|
1.1850
|
18
|
0.04000
|
58
|
0.5183
|
98
|
1.1900
|
19
|
0.04500
|
59
|
0.5717
|
99
|
1.1950
|
20
|
0.05000
|
60
|
0.6250
|
100
|
1.2000
|
21
|
0.05500
|
61
|
0.6783
|
101
|
1.2050
|
22
|
0.06000
|
62
|
0.7317
|
102
|
1.2100
|
23
|
0.06500
|
63
|
0.7850
|
103
|
1.2150
|
24
|
0.07000
|
64
|
0.8384
|
104
|
1.2200
|
25
|
0.07500
|
65
|
0.8917
|
105
|
1.2250
|
26
|
0.08000
|
66
|
0.9117
|
106
|
1.2267
|
27
|
0.08500
|
67
|
0.9317
|
107
|
1.2284
|
28
|
0.09000
|
68
|
0.9517
|
108
|
1.2300
|
29
|
0.09500
|
69
|
0.9717
|
109
|
1.2317
|
30
|
0.10000
|
70
|
0.9917
|
110
|
1.2334
|
31
|
0.10660
|
71
|
1.0034
|
111
|
1.2351
|
32
|
0.11320
|
72
|
1.0150
|
112
|
1.2367
|
33
|
0.11980
|
73
|
1.0267
|
113
|
1.2384
|
34
|
0.12640
|
74
|
1.0383
|
114
|
1.2400
|
35
|
0.13300
|
75
|
1.0500
|
115
|
1.2417
|
36
|
0.13960
|
76
|
1.0568
|
116
|
1.2434
|
37
|
0.14620
|
77
|
1.0636
|
117
|
1.2450
|
38
|
0.15280
|
78
|
1.0704
|
118
|
1.2467
|
39
|
0.15940
|
79
|
1.0772
|
119
|
1.2483
|
40
|
0.16600
|
80
|
1.0840
|
120
|
1.2500
|
(e)
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.
|
(f)
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 Subsection D(16), (17) and (18).
(g)
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.
(h)
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.
(i)
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.
(j)
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.
(k)
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. 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:
[1]
The applicant shall preserve and maintain a special water resource
protection area in accordance with one of the following:
[a]
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
is provided.
[b]
Encroachment within the designated special water
resource protection area 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 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.
[2]
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.
[3]
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:
[a]
Stabilization measures shall not be placed within
150 feet of the Category One waterway;
[b]
Stormwater associated with discharges allowed by
this section shall achieve a 95% TSS postconstruction removal rate;
[c]
Temperature shall be addressed to ensure no impact
on receiving waterway;
[d]
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;
[e]
A conceptual project design meeting shall be held
with the appropriate Department staff and soil conservation district
staff to identify necessary stabilization measures; and
[f]
All encroachments proposed under this section shall
be subject to review and approval by the Department.
[4]
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 Subsection D(17)(k) has been approved by the 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 Subsection D(17)(k) shall maintain or enhance the current functional value and overall condition of the special water resource protection area as defined in Subsection D(17)(k)[1][a] 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.
[5]
This subsection 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
February 2, 2004, provided that the construction begins on or before
February 2, 2009.
(18)
Stormwater runoff quantity standards.
(a)
This subsection contains the minimum design and performance
standards to control stormwater runoff quantity impacts of major development.
(b)
In order to control stormwater runoff quantity impacts, the design engineer shall, using the assumptions and factors for stormwater runoff calculations at Subsection E, complete one of the following:
[1]
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;
[2]
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;
[3]
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
[4]
In tidal flood hazard areas, stormwater runoff quantity analysis in accordance with Subsection D(18)(b)[1], [2] and [3] 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.
(c)
The stormwater runoff quantity standards shall be applied at
the site's boundary to each abutting lot, roadway, watercourse, or
receiving storm sewer system.
E.
Calculation of stormwater runoff and groundwater recharge.
(1)
Stormwater runoff shall be calculated in accordance with the following:
(a)
The design engineer shall calculate runoff using one of the
following methods:
[1]
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
[2]
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.
(b)
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 Subsection E(1)(a)[1] and the Rational and Modified Rational Methods at Subsection E(1)(a)[2]. 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).
(c)
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.
(d)
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.
(e)
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.
(2)
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.
F.
Sources for technical guidance.
(1)
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.
(a)
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.
(b)
Additional maintenance guidance is available on the Department's
website at: https://www.njstormwater.org/maintenance_guidance.htm.
(2)
Additional technical guidance for stormwater management measures
can be obtained from the following:
(a)
The "Standard 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-I.3(a)4;
(b)
The Rutgers Cooperative Extension Service; and
(c)
The soil conservation districts listed in N.J.A.C. 2:90-I.3(a)4.
(3)
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.
G.
Solids and floatable materials control standards.
(1)
Site design features identified under Subsection D(6) above, or alternative designs in accordance with Subsection D(7) above, to prevent discharge of trash and debris from drainage systems shall comply with the following standard to control passage of solid and floatable materials through storm drain inlets. For purposes of this paragraph, "solid and floatable materials" means sediment, debris, trash, and other floating, suspended, or settleable solids. For exemptions to this standard see Subsection G(1)(b) below.
(a)
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:
[1]
The New Jersey Department of Transportation (NJDOT) bicycle-safe
grate, which is described in Chapter 2.4 of the NJDOT Bicycle Compatible
Roadways and Bikeways Planning and Design Guidelines; or
[2]
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.
[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 7.0 square inches, or be no greater than 2.0
inches across the smallest dimension.
(b)
The standard in Subsection G(1)(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 9.0 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:
[a]
A rectangular space 4.625 inches long and 1.5 inches
wide (this option does not apply for outfall netting facilities);
or
[b]
A bar screen having a bar spacing of 0.5 inch.
[c]
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].
[4]
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
[5]
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.
H.
Safety standards for stormwater management basins.
(1)
This subsection 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.
(2)
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 H(3)(a), (b), and (c) for trash racks, overflow grates, and escape provisions at outlet structures.
(3)
Requirements for trash racks, overflow grates and escape provisions.
(a)
A trash rack is a device designed to catch trash and debris
and prevent the clogging of outlet structures. Trash racks shall be
installed at the intake to the outlet from the stormwater management
BMP to ensure proper functioning of the BMP outlets in accordance
with the following:
[1]
The trash rack shall have parallel bars, with no greater than
six-inch spacing between the bars;
[2]
The trash rack shall be designed so as not to adversely affect
the hydraulic performance of the outlet pipe or structure;
[3]
The average velocity of flow through a clean trash rack is not
to exceed 2.5 feet per second under the full range of stage and discharge.
Velocity is to be computed on the basis of the net area of opening
through the rack; and
[4]
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.
(b)
An overflow grate is designed to prevent obstruction of the
overflow structure. If an outlet structure has an overflow grate,
such grate shall meet the following requirements:
[1]
The overflow grate shall be secured to the outlet structure
but removable for emergencies and maintenance.
[2]
The overflow grate spacing shall be no less than two inches
across the smallest dimension.
[3]
The overflow grate shall be constructed and installed to be
rigid, durable, and corrosion resistant and shall be designed to withstand
a perpendicular live loading of 300 pounds per square foot.
(c)
Stormwater management BMPs shall include escape provisions as
follows:
[1]
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 H(3) a freestanding outlet structure may be exempted from this requirement;
[2]
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 Subsection H(5) for an
illustration of safety ledges in a stormwater management BMP; and
[3]
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.
[4]
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.
I.
Requirements for a site development stormwater plan.
(1)
Submission of site development stormwater plan.
(a)
Whenever an applicant seeks municipal approval of a development subject to this section, the applicant shall submit all of the required components of the Checklist for the Site Development Stormwater Plan at Subsection I(3) below as part of the submission of the application for approval.
(b)
The applicant shall demonstrate that the project meets the standards
set forth in this section.
(2)
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
section.
(3)
Submission
of site development stormwater plan. The following information shall
be required:
(a)
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.
(b)
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.
(c)
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.
(d)
Land use planning and source control plan. This plan shall provide a demonstration of how the goals and standards of Subsections C through E 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.
(e)
Stormwater management facilities map. The following information,
illustrated on a map of the same scale as the topographic base map,
shall be included:
[1]
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.
[2]
Details of all stormwater management facility designs, during
and after construction, including discharge provisions, discharge
capacity for each outlet at different levels of detention and emergency
spillway provisions with maximum discharge capacity of each spillway.
(f)
Calculations.
[1]
Comprehensive hydrologic and hydraulic design calculations for the predevelopment and post-development conditions for the design storms specified in Subsection D of this section.
[2]
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. On-site boring logs and soil pit profiles shall be
witnessed by a qualified representative of the Township.
(g)
Maintenance and repair plan. The design and planning of the stormwater management facility shall meet the maintenance requirements of Subsection J.
(h)
Waiver for submission requirements. The municipal official or board reviewing an application under this section may, in consultation with the municipality's review engineer, waive submission of any of the requirements in Subsection I(3)(a) through (f) of this section 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.
J.
Maintenance and repair.
(2)
General maintenance.
(a)
The design engineer shall prepare a maintenance plan for the
stormwater management measures incorporated into the design of a major
development.
(b)
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.
(c)
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.
(d)
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.
(e)
If the party responsible for maintenance identified under Subsection J(2)(c) above is not a public agency, the maintenance plan and any future revisions based on Subsection J(2)(g) below shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan must be undertaken.
(f)
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.
(g)
The party responsible for maintenance identified under Subsection J(2)(c) above shall perform all of the following requirements:
[1]
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;
[2]
Evaluate the effectiveness of the maintenance plan at least
once per year and adjust the plan and the deed as needed; and
(i)
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.
(3)
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.
L.
Severability. Each section, subsection, sentence, clause and phrase
of this section is declared to be an independent section, subsection,
sentence, clause and phrase, and the finding or holding of any such
portion of this section to be unconstitutional, void, or ineffective
for any cause, or reason, shall not affect any other portion of this
section.
M.
Effective date. This section shall be in full force and effect from
and after its adoption and any publication as required by law.
[Added by Ord. No. 30-2001]
A.
Purpose and applicability. All tracts falling in whole or in part within a stream corridor shall be subject to the standards set forth in this § 330-50.
B.
Activities permitted in stream corridors. Stream corridors
shall remain in their natural state, with no clearing or cutting of
trees and brush (except for removal of dead vegetation and pruning
for reasons of public safety), altering of watercourses, regrading
or construction except for the following activities:
(1)
Wildlife sanctuaries, woodland preserves and arboretums,
but excluding enclosed structures.
(2)
Game farms, fish hatcheries and fishing reserves,
operated for the protection and propagation of wildlife, but excluding
enclosed structures.
(3)
Unpaved walking, bicycle and bridle trails.
(4)
Fishing areas.
(5)
Reconstruction of a structure which predates the adoption
of this section in the event of damage or destruction by fire, natural
hazards, or other acts of God, provided that the reconstruction does
not have a greater footprint or total area than that of the damaged
structure and that no change in land use occurs; and further provided
that the reconstruction shall be permitted only if no more than 50%
of the structure is destroyed.
(6)
Any agricultural use or activity except for barns,
stables, feed lots, barn yards, poultry buildings or farm waste disposal
facilities.
C.
Locations of activities on tracts partially within
stream corridors. All new lots in major and minor subdivisions and
site plans created after the date of this section shall be designed
to provide sufficient areas outside of stream corridors to accommodate
primary structures as well as any normal accessory uses appurtenant
thereto. The following activities associated with applications after
the date of this section are permitted within the stream corridor
if no other reasonable or prudent alternative is available:
(1)
Private or public water supply wells that have a sanitary
seal, floodproofed water treatment facilities or pumping facilities.
(2)
Dredging or grading work incidental to permitted structures
or uses, including stream cleaning and stream rehabitation, work undertaken
to prove hydraulics or to protect public health.
(3)
Dams, culverts, bridges and roads, provided that they
cross the corridor as directly as practical.
(4)
Sanitary or storm sewers, detention or retention basins
and related outfall facilities.
(5)
Utility transmission lines installed during periods
of low stream flow in accordance with soil erosion and sediment control
practices and approved by the Hunterdon County Soil Conservation District
and the New Jersey Department of Environmental Protection.
D.
Activities permitted in stream corridors when prohibiting
such activities would causes extreme economic hardship.
(1)
New structures other than those permitted Subsections B and C, including retaining walls, parking facilities and roads (but not those that are parallel to the stream) are permitted in the stream corridor if only if:
(a)
Upon a clear and convincing demonstration by
the applicant that prohibiting such activity would result in extreme
economic hardship or would conflict with a compelling public need.
The Planning Board shall use the following standards in determining
whether extreme economic hardship exists:
[1]
Prohibiting the activity would result in an
extreme economic hardship as distinguished from mere inconvenience,
because the particular physical surroundings, shape or topographical
conditions of the property involved. The necessity of acquiring additional
land to locate development outside the stream corridor shall not be
considered an economic hardship unless the applicant can demonstrate
that there is no adjacent land that is reasonably available.
[2]
An applicant shall be deemed to have established
the existence of an extreme economic hardship only if the applicant
demonstrates based on the specific facts that the subject property
is not capable of yielding a reasonable economic return if its present
use is continued or if it is developed as authorized by provisions
of this subsection and that this inability to yield a reasonable economic
return results from a unique circumstance peculiar to the subject
property which:
[a]
Do not apply or affect other property
in the immediate vicinity;
[b]
Relate to or arise out of the characteristics
of the subject property rather than the personal situations of the
applicant;
[c]
Are not the result of any action
or inaction by the applicant or the owner or their predecessors in
title.
[3]
An applicant shall be deemed to have established
compelling public need if the applicant demonstrates based on specific
facts that:
[a]
The proposed project will serve
as an essential public health or safety need;
[b]
The public health and safety require
the proposed activity;
[c]
The proposed use is required to
serve existing public health or safety needs;
[d]
There is no alternative available
to meet the established public health or safety need;
[e]
The activity will not be materially
detrimental or injurious to other property or improvements in the
area in which the subject property is located and will not endanger
public safety;
[f]
The exception granted is the minimum
relief necessary to relieve the compelling public need.
(b)
The stream corridor includes more than 75% of
the tract.
(3)
If such an exception is granted, the applicant shall
rehabilitate an environmentally degraded stream corridor within or
adjacent to the same tract at least equivalent in size to the stream
corridor reduction permitted and if not possible rehabilitate or expand
a stream corridor of such size within a nearby tract and if available,
within the same watershed. Rehabilitation shall include reforestation,
stream bank stabilization and removal of debris. The area to be rehabilitated
shall be acceptable to the Planning Board.
E.
F.
Provisions governing activities in stream corridors.
(1)
The applicant for any activity permitted in a stream
corridor shall rehabilitate any degraded areas within the stream corridor
in a manner acceptable to the Planning Board unless the applicant
demonstrates that it is economically infeasible to do so. The applicant
shall also:
(2)
The applicant shall provide whatever additional measures
are necessary to assure that areas designated as stream corridors
will be preserved and to prevent additional encroachments in a stream
corridor likely to occur as a result of the approval granted.
(3)
The Planning Board requires conservation easements
and/or deed restrictions assuring that there will be no further intrusion
on the stream corridor than that permitted by the activity approved.