[Amended 12-14-1981 by Ord. No. 21-81; 2-8-1993 by Ord. No. 2-93; 12-11-1995 by Ord. No. 17-95; 4-25-2005 by Ord. No. 05-09; 3-27-2006 by Ord. No. 06-06; 3-11-2013 by Ord. No. 13-04; 3-8-2021 by Ord. No. 21-05; 5-28-2024 by Ord. No. 24-09]
A.
Policy statement. Flood control, groundwater recharge, and pollutant
reduction shall be achieved through the use of stormwater management
measures, including green infrastructure best management practices
("GI BMPs") and nonstructural stormwater management strategies. GI
BMPs 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 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 green infrastructure, water
quality, quantity, and groundwater recharge.
B.
Purpose. The purpose of this chapter is to establish minimum stormwater management requirements and controls for "major development," as defined in § 165-111.
C.
Applicability.
(1)
This chapter shall be applicable to the following major developments:
(2)
This chapter shall also be applicable to all major developments
undertaken by the Borough of Chatham.
(3)
Applicability of this chapter to major developments shall comply
with last amended N.J.A.C. 7:8-1.6, incorporated herein by reference.
D.
Compatibility with Other Permit and Ordinance Requirements. Development
approvals issued pursuant to this chapter 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 chapter
shall be held to be the minimum requirements for the promotion of
the public health, safety, and general welfare. This chapter 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 chapter imposes restrictions different
from those imposed by any other ordinance, rule or regulation, or
other provision of law, the more restrictive provisions or higher
standards shall control.
For the purpose of this chapter, the following terms, phrases,
words and their derivations shall have the meanings stated herein
unless their use in the text of this chapter 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 used in this chapter shall
be the same as the last amended Stormwater Management Rules at N.J.A.C.
7:8-1.2, incorporated herein by reference.
This section establishes design and performance standards for
stormwater management measures for major development intended to minimize
the adverse impact of stormwater runoff on water quality and water
quantity and loss of groundwater recharge in receiving water bodies.
Design and performance standards for stormwater management measures
shall comply with last amended N.J.A.C. 7:8-5, incorporated herein
by reference.
A.
Site design features identified under § 165-112, or alternative designs in accordance with § 165-112, to prevent discharge of trash and debris from drainage systems shall comply with the following standard to control passage of solid and floatable materials through storm drain inlets. For purposes of this subsection, "solid and floatable materials" means sediment, debris, trash, and other floating, suspended, or settleable solids. For exemptions to this standard see § 165-113A(2).
(1)
Design engineers shall use one of the following grates whenever
they use a grate in pavement or another ground surface to collect
stormwater from that surface into a storm drain or surface water body
under that grate:
(a)
The New Jersey Department of Transportation ("NJDOT") bicycle-safe
grate, which is described in Chapter 2.4 of the NJDOT Bicycle Compatible
Roadways and Bikeways Planning and Design Guidelines; or
(b)
A different grate, if each individual clear space in that grate
has an area of no more than seven square inches, or is no greater
than 0.5 inch across the smallest dimension. Note that the Residential
Site Improvement Standards at N.J.A.C. 5:21 include requirements for
bicycle-safe grates. Examples of grates subject to this standard include
grates in grate inlets, the grate portion (non-curb-opening portion)
of combination inlets, grates on storm sewer manholes, ditch grates,
trench grates, and grates of spacer bars in slotted drains. Examples
of ground surfaces include surfaces of roads (including bridges),
driveways, parking areas, bikeways, plazas, sidewalks, lawns, fields,
open channels, and stormwater system floors used to collect stormwater
from the surface into a storm drain or surface water body.
(c)
For curb-opening inlets, including curb-opening inlets in combination
inlets, the clear space in that curb opening, or each individual clear
space if the curb opening has two or more clear spaces, shall have
an area of no more than seven square inches, or be no greater than
two inches across the smallest dimension.
(2)
The standard in § 165-113A(1) does not apply:
(a)
Where each individual clear space in the curb opening in existing
curb-opening inlet does not have an area of more than nine square
inches;
(b)
Where the Borough agrees that the standards would cause inadequate
hydraulic performance that could not practicably be overcome by using
additional or larger storm drain inlets;
(c)
Where flows from the water quality design storm as specified
in the last amended Stormwater Management rules at N.J.A.C. 7:8 et
seq. are conveyed through any device (e.g., end of pipe netting facility,
manufactured treatment device, or a catch basin hood) that is designed,
at a minimum, to prevent delivery of all solid and floatable materials
that could not pass through one of the following:
[1]
A rectangular space 4 5/8 (4.625) inches long and 1 1/2
(1.5) inches wide (this option does not apply for outfall netting
facilities); or
[2]
A bar screen having a bar spacing of 0.5 inch.
Note that these exemptions do not authorize any infringement
of requirements in the Residential Site Improvement Standards for
bicycle-safe grates in new residential development [N.J.A.C. 5:21-4.18(b)2
and 7.4(b)1].
(d)
Where flows are conveyed through a trash rack that has parallel
bars with one-inch spacing between the bars, to the elevation of the
Water Quality Design Storm as specified in N.J.A.C. 7:8; or
(e)
Where the New Jersey Department of Environmental Protection
determines, pursuant to the New Jersey Register of Historic Places
Rules at N.J.A.C. 7:4-7.2(c), that action to meet this standard is
an undertaking that constitutes an encroachment or will damage or
destroy the New Jersey Register listed historic property.
A.
This section sets forth requirements to protect public safety through
the proper design and operation of stormwater management basins. This
section applies to any new stormwater management basin. Safety standards
for stormwater management measures shall comply with last amended
N.J.A.C. 7:8-6, incorporated herein by reference.
B.
Safety Ledge Illustration:
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A.
Submission of site development stormwater plan.
(1)
Whenever an applicant seeks Borough approval of a development subject to this chapter, the applicant shall submit all of the required components of the checklist for the site development stormwater plan at § 165-115C as part of the submission of the application for approval.
(2)
The applicant shall demonstrate that the project meets the standards
set forth in this chapter.
B.
Site development stormwater plan approval. The applicant's site
development project shall be reviewed as a part of the review process
by the Borough board or official from which municipal approval is
sought. That Borough board or official shall consult the Borough'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 chapter.
C.
Submission of site development stormwater plan. The following information
shall be required:
(1)
Topographic base map. The reviewing engineer may require upstream
tributary drainage system information as necessary. It is recommended
that the topographic base map of the site be submitted which extends
a minimum of 200 feet beyond the limits of the proposed development,
at a scale of one inch equals 200 feet or greater, showing two-foot
contour intervals. The map as appropriate may indicate the following:
existing surface water drainage, shorelines, steep slopes, soils,
erodible soils, perennial or intermittent streams that drain into
or upstream of the Category One waters, wetlands and flood plains
along with their appropriate buffer strips, marshlands and other wetlands,
pervious or vegetative surfaces, existing man-made structures, roads,
bearing and distances of property lines, and significant natural and
manmade features not otherwise shown.
(2)
Environmental site analysis. A written and graphic description
of the natural and man-made features of the site and its surroundings
should be submitted. This description should include a discussion
of soil conditions, slopes, wetlands, waterways and vegetation on
the site. Particular attention should be given to unique, unusual,
or environmentally sensitive features and to those that provide particular
opportunities or constraints for development.
(3)
Project description and site plans. A map (or maps) at the scale
of the topographical base map indicating the location of existing
and proposed buildings roads, parking areas, utilities, structural
facilities for stormwater management and sediment control, and other
permanent structures. The map(s) shall also clearly show areas where
alterations will occur in the natural terrain and cover, including
lawns and other landscaping, and seasonal high groundwater elevations.
A written description of the site plan and justification for proposed
changes in natural conditions shall also be provided.
(4)
Land use planning and source control plan. This plan shall provide a demonstration of how the goals and standards of § 165-115 are being met. The focus of this plan shall be to describe how the site is being developed to meet the objective of controlling groundwater recharge, stormwater quality and stormwater quantity problems at the source by land management and source controls whenever possible.
(5)
Stormwater management facilities map. The following information,
illustrated on a map of the same scale as the topographic base map,
shall be included:
(a)
Total area to be disturbed, paved or built upon, proposed surface
contours, land area to be occupied by the stormwater management facilities
and the type of vegetation thereon, and details of the proposed plan
to control and dispose of stormwater.
(b)
Details of all stormwater management facility designs, during
and after construction, including discharge provisions, discharge
capacity for each outlet at different levels of detention and emergency
spillway provisions with maximum discharge capacity of each spillway.
(6)
Calculations.
(a)
Comprehensive hydrologic and hydraulic design calculations for the pre-development and post-development conditions for the design storms specified in § 165-115.
(b)
When the proposed stormwater management control measures depend
on the hydrologic properties of soils or require certain separation
from the seasonal high water table, then a soils report shall be submitted.
The soils report shall be based on on-site boring logs or soil pit
profiles. The number and location of required soil borings or soil
pits shall be determined based on what is needed to determine the
suitability and distribution of soils present at the location of the
control measure.
(7)
Maintenance and repair plan. The design and planning of the stormwater management facility shall meet the maintenance requirements of § 165-115.
(8)
Waiver from submission requirements. The Borough official or board reviewing an application under this chapter may, in consultation with the Borough's review engineer, waive submission of any of the requirements in § 165-115C(1) through (6) when it can be demonstrated that the information requested is impossible to obtain or it would create a hardship on the applicant to obtain and its absence will not materially affect the review process.
B.
General maintenance.
(1)
Maintenance for stormwater management measures shall comply
with last amended N.J.A.C. 7:8-5.8, incorporated herein by reference.
(2)
Applicants shall be required to post performance and maintenance
guarantees in accordance with N.J.S.A. 40:55D-53, incorporated herein
by reference.
(3)
The following requirements of N.J.A.C. 7:8-5.8 do not apply
to stormwater management facilities that are dedicated to and accepted
by the Borough or another governmental agency, subject to all applicable
municipal stormwater general permit conditions, as issued by the Department
of Environmental Protection:
(a)
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; and
(b)
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.
(4)
In the event that the stormwater management facility becomes
a danger to public safety or public health, or if it needs maintenance
or repair, the Borough 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 Borough engineer or designee. The Borough,
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 Borough or the County
of Morris 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.
Each section, subsection, sentence, clause and phrase of this
chapter is declared to be an independent section, subsection, sentence,
clause and phrase, and the finding or holding of any such portion
of this chapter to be unconstitutional, void, or ineffective for any
cause, or reason, shall not affect any other portion of this chapter.
This chapter shall be in full force and effect from and after
its adoption and any publication as required by law.
