[Adopted 10-11-2006 by Ord. No. 11-2006]
A.
Purpose.
(1)
It is hereby determined that:
(a)
Land development projects and associated disturbance
of vegetation and soil and changes in land cover, including increases
in impervious cover, alter the hydrologic response of local watersheds
and increase stormwater runoff rates and volumes. If inadequately
or improperly managed, this stormwater runoff can deplete groundwater
resources and increase flooding, stream channel erosion, and sediment
transport and deposition.
(b)
This stormwater runoff contributes to increased
quantities of waterborne pollutants.
(c)
Increases of stormwater runoff, soil erosion
and nonpoint-source pollutants have occurred in the past as a result
of land development, and contribute to the degradation of the water
resources of the Borough of Folsom and downstream municipalities.
(d)
Certain lands of the Borough of Folsom lie within
the Pinelands Area, and therefore, development in this portion of
Borough of Folsom is subject to the requirements of the Pinelands
Protection Act (N.J.S.A. 13:18A-1 et seq.) and the implementing regulations
and minimum standards contained in the Pinelands Comprehensive Management
Plan (N.J.A.C. 7:50-1.1 et seq.) (CMP). The purpose and intent of
these regulations and standards is to promote orderly development
of the Pinelands so as to preserve and protect the significant and
unique natural, ecological, agricultural, archaeological, historical,
scenic, cultural and recreational resources of the Pinelands.
(e)
Pinelands Area resources are to be protected
in accordance with Pinelands Comprehensive Management Plan at N.J.A.C.
7:50 et seq., New Jersey's Stormwater Management Rules at N.J.A.C.
7:8-1.1 et seq., and New Jersey's surface water quality antidegradation
policies contained in the New Jersey Surface Water Quality Standards
at N.J.A.C. 7:9B-1.1 et seq., Permitted uses shall maintain the ecological
character and quality of the Pinelands, including good water quality
and natural rates and volumes of flow.
(f)
Increased stormwater rates and volumes and the
sediments and pollutants associated with stormwater runoff from future
development projects within the Pinelands Area have the potential
to adversely affect Borough of Folsom's streams and water resources
and the streams and water resources of downstream municipalities.
(g)
Stormwater runoff, soil erosion and nonpoint-source
pollution can be controlled and minimized through the regulation of
stormwater runoff from development sites.
(h)
It is in the public interest to regulate the discharge of stormwater runoff from major development projects, as defined in § 164-18 of this article, conducted within the Pinelands Area, as provided in this article, in order to control and minimize increases in stormwater runoff rates and volumes, to maintain groundwater recharge, and to control and minimize soil erosion, stream channel erosion and nonpoint-source pollution associated with stormwater runoff.
(2)
Therefore, it is the purpose of this article to establish
minimum stormwater management requirements and controls for major
development, consistent with the statewide stormwater requirements
at N.J.A.C. 7:8, the regulations and standards contained in the Pinelands
CMP, and the provisions of the adopted Master Plan and land use ordinances
of the Borough of Folsom.
B.
Goals and techniques.
(1)
Through this article, the Borough of Folsom has established
the following goals for stormwater control:
(a)
To reduce flood damage, including damage to
life and property;
(b)
To minimize any increase in stormwater runoff
from new development;
(c)
To reduce soil erosion from any development
or construction project;
(d)
To assure the adequacy of existing and proposed
culverts and bridges, and other in-stream structures;
(e)
To maintain groundwater recharge;
(f)
To minimize any increase in nonpoint pollution;
(g)
To maintain the integrity of stream channels
for their biological functions as well as for drainage;
(h)
To restore, protect, maintain and enhance the
quality of the streams and water resources of Borough of Folsom and
the ecological character and quality of the Pinelands Area;
(i)
To minimize pollutants in stormwater runoff
from new and existing development in order to restore, protect, enhance
and maintain the chemical, physical and biological integrity of the
surface and ground waters of the Borough of Folsom, to protect public
health and to enhance the domestic, municipal, recreational, industrial
and other uses of water; and
(j)
To protect public safety through the proper
design and operation of stormwater management basins.
(2)
In order to achieve the goals for stormwater control
set forth in this article, the Borough of Folsom has identified the
following management techniques:
(a)
Implementation of multiple stormwater management
best management practices (BMPs) may be necessary to achieve the performance
standards for stormwater runoff quantity and rate, groundwater recharge,
erosion control, and stormwater runoff quality established through
this article.
(b)
Compliance with the stormwater runoff quantity
and rate, groundwater recharge, erosion control, and stormwater runoff
quality standards established through N.J.A.C. 7:8-1.1 et seq., and
this article shall be accomplished to the maximum extent practicable
through the use of nonstructural BMPs, before relying on structural
BMPs. Nonstructural BMPs are also known as low-impact development
(LID) techniques.
(c)
Nonstructural BMPs shall include both environmentally
sensitive site design and source controls that prevent pollutants
from being placed on the site or from being exposed to stormwater.
(d)
Source control plans shall be developed based
upon physical site conditions and the origin, nature and the anticipated
quantity or amount of potential pollutants.
(e)
Structural BMPs, where necessary, shall be integrated
with nonstructural stormwater management strategies and proper maintenance
plans.
(f)
When using structural BMPs, multiple stormwater
management measures, smaller in size and distributed spatially throughout
the land development site, shall be used wherever possible to achieve
the performance standards for water quality, quantity and groundwater
recharge established through this article before relying on a single,
larger stormwater management measure to achieve these performance
standards.
C.
Applicability. This article shall apply to:
(1)
All site plans and subdivisions for major developments
occurring within the Pinelands Area that require preliminary or final
site plan or subdivision review; and
(2)
All major development projects undertaken by the Borough
of Folsom shall comply with this article.[1]
[1]
Note: This clause is intended to provide consistency
with DEP's stormwater management requirements. As per normal practice,
all development within the Pinelands Area which is undertaken by a
Pinelands Area municipality shall comply with all of the requirements
of the CMP.
D.
Procedures. In addition to other development review procedures set forth in the Code of the Borough of Folsom, major developments located within the Pinelands Area shall comply with the stormwater management requirements and specifications set forth in this article. New agricultural development that meets the definition of major development in § 164-18 of this article shall be submitted to the appropriate soil conservation district for review and approval in accordance with the requirements of N.J.A.C. 5.4(b) 7:8.
E.
Compatibility with other permit and ordinance requirements.
(1)
Development approvals issued for subdivisions and
site plans pursuant to this article are to be considered an integral
part of development approvals under the subdivision and site plan
review process and do not relieve the applicant of the responsibility
to secure required permits or approvals for activities regulated by
any other applicable ordinance, code, rule, regulation, statute, act
or other provision of law.
(2)
In their interpretation and application, the provisions
of this article shall be held to be the minimum requirements for the
promotion of the public health, safety and general welfare. This article
is not intended to interfere with, abrogate or annul any other ordinances,
rule or regulation, statute or other provision of law except that,
where any provision of this article imposes restrictions different
from those imposed by any other ordinance, rule or regulation or other
provision of law, the more restrictive or stringent provisions or
higher standards shall control.
(3)
In the event that a regional stormwater management
plan(s) is prepared and formally adopted pursuant to N.J.A.C. 7:8-1.1
et seq., for any drainage area(s) or watershed(s) of which the Borough
of Folsom is a part, the stormwater provisions of such a plan(s) shall
be adopted by Folsom within one year of the adoption of a regional
stormwater management plan (RSWMP) as an amendment to an areawide
water quality management plan. Local ordinances proposed to implement
the RSWMP shall be submitted to the Commission for certification within
six months of the adoption of the RSWMP per N.J.A.C. 7:8 and the Pinelands
CMP (N.J.A.C. 7:50).
A.
Submission of site development stormwater plan.
(1)
Whenever an applicant seeks municipal approval of a site development that is subject to this article, the applicant shall submit all of the required components of the checklist for the site development stormwater plan at Subsection C below as part of the applicant's application for subdivision or site plan approval. These required components are in addition to any other information required under any provisions of the Borough of Folsom's land use ordinance or by the Pinelands Commission pursuant to N.J.A.C. 7:50-1.1 et seq.
(2)
The applicant shall demonstrate that the site development
project meets the standards set forth in this article.
B.
Site development stormwater plan approval.
(1)
The applicant's site development stormwater plan shall
be reviewed as a part of the subdivision or site plan review process
by the municipal board or official from whom municipal approval is
sought. That municipal board or official shall consult the engineer
retained by the Planning and/or Zoning Board (as appropriate) to determine
if all of the checklist requirements have been satisfied and to determine
if the project meets the standards set forth in this article.
C.
Checklist requirements. Any application for approval
of a major development shall include at least the following information.
All required engineering plans shall be submitted to the Borough of
Folsom and the Pinelands Commission in AutoCAD 2004 format, registered
and rectified to New Jersey State Plane Feet NAD 83 or Shape Format
New Jersey State Plan Feet NAD 83, and all other documents shall be
submitted in both paper and commonly used electronic file formats
such as pdf., word processing, database or spreadsheet files. Three
copies of each item shall be submitted.
(1)
Topographic base map. The applicant shall submit a
topographic base map of the site which extends a minimum of 300 feet
beyond the limits of the proposed development, at a scale of one inch
equals 200 feet or greater, showing one-foot contour intervals. The
map shall indicate the following: existing surface water drainage,
shorelines, steep slopes, soils, highly erodible soils, perennial
or intermittent streams that drain into or upstream of any Category
One or Pinelands waters, wetlands and floodplains along with their
appropriate buffer strips, marshlands and other wetlands, pervious
or vegetative surfaces, existing surface and subsurface human-made
structures, roads, bearing and distances of property lines, and significant
natural and man-made features not otherwise shown. The Borough of
Folsom or the Pinelands Commission may require upstream tributary
drainage system information as necessary.
(2)
Environmental site analysis. The applicant shall submit
a written description along with the drawings of the natural and human-made
features of the site and its environs. This description should include:
(a)
A discussion of environmentally critical areas,
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
for or constraints on development; and
(b)
Detailed soil and other environmental conditions
on the portion of the site proposed for installation of any stormwater
BMPs, including, at a minimum: soils report based on on-site soil
tests; locations and spot elevations in plan view of test pits and
permeability tests; permeability test data and calculations; and any
other required soil data (e.g., mounding analyses results) correlated
with location and elevation of each test site; cross section of proposed
stormwater BMP with side-by-side depiction of soil profile drawn to
scale and seasonal high water table elevation identified; and any
other information necessary to demonstrate the suitability of the
specific proposed structural and nonstructural stormwater management
measures relative to the environmental conditions on the portion(s)
of the site proposed for implementation of those measures.
(3)
Project description and site plan(s). The applicant
shall submit 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.
(a)
The applicant shall submit a detailed land use planning and source control plan which provides a description of how the site will be developed to meet the erosion control, groundwater recharge and stormwater runoff quantity and quality standards at § 164-15 through use of nonstructural or low-impact development techniques and source controls to the maximum extent practicable before relying on structural BMPs. The land use planning and source control plan shall include a detailed narrative and associated illustrative maps and/or plans that specifically address how each of the following nine nonstructural strategies identified in Subchapter 5 of the NJDEP Stormwater Management Rules (N.J.A.C. 7:8-5) and set forth below (Subsections C(4)(a)[1] through C(4)(a)[9]) will be implemented to the maximum extent practicable to meet the standards at § 164-15 of this article on the site. If one or more of the nine nonstructural strategies will not be implemented on the site, the applicant shall provide a detailed rationale establishing a basis for the contention that use of the strategy is not practicable on the site.
[1]
Protect areas that provide water quality benefits
or areas particularly susceptible to erosion and sediment loss;
[2]
Minimize impervious surfaces and break up or
disconnect the flow of runoff over impervious surfaces;
[3]
Maximize the protection of natural drainage
features and vegetation;
[4]
Minimize the decrease in the predevelopment
time of concentration;
[5]
Minimize land disturbance including clearing
and grading;
[6]
Minimize soil compaction and all other soil
disturbance;
[7]
Provide low-maintenance landscaping that provides
for the retention and planting of native plants and minimizes the
use of lawns, fertilizers and pesticides, in accordance with N.J.A.C.
7:50-6.24;
[8]
Provide vegetated open-channel conveyance systems
discharging into and through stable vegetated areas; and
[9]
Provide other source controls to prevent or
minimize the use or exposure of pollutants at the site in order to
prevent or minimize the release of those pollutants into stormwater
runoff. These source controls shall include, but are not limited to:
[a]
Site design features that help
to prevent accumulation of trash and debris in drainage systems;
[b]
Site design features that help
to prevent discharge of trash and debris from drainage systems;
[c]
Site design features that help
to prevent and/or contain spills or other harmful accumulations of
pollutants at industrial or commercial developments; and
[d]
Applying fertilizer in accordance
with the requirements established under the Soil Erosion and Sediment
Control Act, N.J.S.A. 4:24-39 et seq., and implementing rules, when
establishing vegetation after land disturbance.
(b)
For sites where stormwater will be generated from high pollutant loading areas or where stormwater will be exposed to source material, as defined in § 164-18 of this article, the applicant shall also demonstrate in the land use planning and source control plan that the requirements of § 164-15 have been met.
(c)
The use of nonstructural strategies to meet the performance standards in § 164-15 of this article is not required for development sites creating less than one acre of disturbance. However, each application for major development and any other application where the Borough of Folsom otherwise requires a landscaping plan shall contain a landscaping or revegetation plan in accordance with the CMP standards at N.J.A.C. 7:50-6.24(c). In addition, the applicant shall demonstrate that, at a minimum, existing trees and vegetation on the development site will be preserved and protected according to the minimum standards established by provisions of the Borough of Folsom Land Use Ordinance, Zoning Ordinance or by conditions of zoning or variance approval.
(5)
Stormwater management facilities map. The applicant
shall submit a map, at the same scale as the topographic base map,
depicting the following information:
(a)
The total area to be disturbed, paved and/or
built upon, proposed surface contours, land area to be occupied by
the stormwater management facilities and the type of vegetation thereon,
and details of the proposed plan to manage and dispose of stormwater;
and
(b)
Details of all stormwater management facility
designs, during and after construction, including discharge provisions,
discharge capacity for each outlet at different levels of detention
(if applicable) and emergency spillway provisions with maximum discharge
capacity of each spillway.
(6)
Calculations (groundwater recharge and stormwater runoff rate, volume and quality). The applicant shall submit comprehensive hydrologic and hydraulic design calculations for the predevelopment and postdevelopment conditions for the design storms specified in § 164-14. The standards for groundwater recharge and stormwater runoff rate, volume and quality required by § 164-15 shall be met using the methods, calculations and assumptions provided in § 164-14.
(7)
Inspection, maintenance and repair plan. The applicant shall submit a detailed plan describing how the proposed stormwater management measure(s) shall meet the maintenance and repair requirements of § 164-17 of this article. Said plan shall include, at a minimum, the following elements:
(a)
The frequency with which inspections will be
made;
(b)
The specific maintenance tasks and requirements
for each proposed structural and nonstructural BMP;
(c)
The name, address and telephone number for the
entity responsible for implementation of the maintenance plan;
(d)
The reporting requirements; and
(e)
Copies of the inspection and maintenance reporting
sheets.
(8)
Exception from submission requirements. An exception may be granted from submission of any of these required components (except Subsection C(7) above, Inspection, maintenance, and repair plan) if its absence will not materially affect the review process. However, items required pursuant to the application requirements in the Pinelands CMP [N.J.A.C. 7:50-4.2(b)] shall be submitted to the New Jersey Pinelands Commission unless the Executive Director waives or modifies the application requirements.
A.
Method of calculating stormwater runoff rate and volume.
(1)
In complying with the stormwater runoff quantity and rate standards in § 164-15B, the design engineer shall calculate the stormwater runoff rate and volume using the USDA Natural Resources Conservation Service (NRCS) Runoff Equation, Runoff Curve Numbers, and Dimensionless Unit Hydrograph, as described in the NRCS National Engineering Handbook Part 630 — Hydrology and Technical Release 55 — Urban Hydrology for Small Watersheds, incorporated herein by reference, as amended and supplemented. Alternative methods of calculation may be utilized, provided such alternative methods are at least as protective as the NRCS methodology when considered on a regional stormwater management basis.
(2)
In calculating stormwater runoff using the NRCS methodology,
the design engineer shall separately calculate and then combine the
runoff volumes from pervious and directly connected impervious surfaces
within each drainage area within the parcel.
(3)
Calculation of stormwater runoff from unconnected
impervious surfaces shall be based, as applicable, upon the Two-Step
Method described in the current New Jersey Stormwater Best Management
Practices Manual or the NRCS methodology.
(4)
In calculating stormwater runoff using the NRCS methodology,
the design engineer shall use appropriate twenty-four-hour rainfall
depths as developed for the project site by the National Oceanic and
Atmospheric Administration, available online at http://hdsc.nws.noaa.gov/hdsc/pfds/index.html.
(5)
When calculating stormwater runoff for predeveloped
site conditions, the design engineer shall use the following criteria:
(a)
When selecting or calculating runoff curve numbers
(CNs) for predeveloped project site conditions, the project site's
land cover shall be assumed to be woods in good condition. However,
another land cover may be used to calculate runoff coefficients if:
[1]
Such land cover has existed at the site or portion
thereof without interruption for at least five years immediately prior
to the time of application; and
[2]
The design engineer can document the character
and extent of such land cover through the use of photographs, affidavits,
and/or other acceptable land use records.
(b)
If more than one land cover has existed on the
site during the five years immediately prior to the time of application,
the land cover with the lowest runoff potential shall be used for
the computations.
(c)
All predeveloped land covers shall be assumed
to be in good hydrologic condition and, if cultivated, shall be assumed
to have conservation treatment.
(d)
In calculating predeveloped site stormwater
runoff, the design engineer shall include the effects of all land
features and structures, such as ponds, wetlands, depressions, hedgerows
and culverts, that affect predeveloped site stormwater runoff rates
and/or volumes.
(e)
Where tailwater will affect the hydraulic performance
of a stormwater management measure, the design engineer shall include
such effects in the measure's design.
B.
Method of calculating stormwater runoff quality.
(1)
In complying with the stormwater runoff quality standards in § 164-15F(1), the design engineer shall calculate the stormwater runoff rate and volume using the USDA Natural Resources Conservation Service (NRCS) Runoff Equation, Runoff Curve Numbers, and Dimensionless Unit Hydrograph, as described in the NRCS National Engineering Handbook Part 630 — Hydrology and Technical Release 55 — Urban Hydrology for Small Watersheds, as amended and supplemented.
(2)
The design engineer shall also use the NJDEP water
quality design storm, which is 1.25 inches of rainfall falling in
a nonlinear pattern in two hours. Details of the water quality design
storm are shown in Table 1.
(3)
Calculation of runoff volumes, peak rates, and hydrographs
for the water quality design storm may take into account the implementation
of nonstructural and structural stormwater management measures.
|
Table 1
Water Quality Design Storm Distribution3
| ||||
|---|---|---|---|---|
|
Time
(minutes)
|
Cumulative Rainfall
(inches)
|
Time
(minutes)
|
Cumulative Rainfall
(inches)
| |
|
0
|
0.0000
|
65
|
0.8917
| |
|
5
|
0.0083
|
70
|
0.9917
| |
|
10
|
0.0166
|
75
|
1.0500
| |
|
15
|
0.0250
|
80
|
1.0840
| |
|
20
|
0.0500
|
85
|
1.1170
| |
|
25
|
0.0750
|
90
|
1.1500
| |
|
30
|
0.1000
|
95
|
1.1750
| |
|
35
|
0.1330
|
100
|
1.2000
| |
|
40
|
0.1660
|
105
|
1.2250
| |
|
45
|
0.2000
|
110
|
1.2334
| |
|
50
|
0.2583
|
115
|
1.2417
| |
|
55
|
0.3583
|
120
|
1.2500
| |
|
60
|
0.6250
| |||
|
3 Source: N.J.A.C.
7:8-5.5(a).
|
(4)
Total Suspended Solids (TSS) reduction calculations.
(a)
If more than one stormwater BMP in series is
necessary to achieve the required eighty-percent 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; and
| ||
|
B
|
=
|
the TSS percent removal rate applicable to the
second BMP.
| ||
(b)
If there is more than one on-site drainage area,
the eighty-percent TSS removal rate shall apply to each drainage area,
unless the runoff from the subareas converge on site, in which case
the removal rate can be demonstrated through a calculation using a
weighted average.
(5)
TSS removal rates for stormwater BMPs.
(a)
For purposes of TSS reduction calculations, Table 2 presents the presumed removal rates for certain BMPs designed in accordance with the New Jersey BMP Manual. The BMP Manual may be obtained from the address identified in § 164-23A or found on the NJDEP's Web site at www.njstormwater.org. TSS reduction shall be calculated based on the removal rates for the BMPs in Table 2.
(b)
Alternative stormwater management measures,
removal rates and methods of calculating removal rates may be used
if the design engineer provides documentation demonstrating the capability
of these alternative rates and methods to the Borough of Folsom. Any
alternative stormwater management measure, removal rate or method
of calculating the removal rate shall be subject to approval by the
Borough of Folsom, and a copy shall be provided to the following:
[1]
The Division of Watershed Management, New Jersey
Department of Environmental Protection, PO Box 418, Trenton, New Jersey,
08625-0418; and
[2]
The New Jersey Pinelands Commission, PO Box
7, New Lisbon, New Jersey, 08064.
|
Table 2
Pollutant Removal Rates for BMPs4
| |||
|---|---|---|---|
|
Best Management Practice
|
TSS Percent Removal Rate
|
Total Phosphorus Percent Removal Rate
|
Total Nitrogen Percent Removal Rate
|
|
Bioretention systems
|
90
|
60
|
30
|
|
Constructed stormwater wetland
|
90
|
50
|
30
|
|
Extended detention basin
|
40 to 60 (final rate based upon detention time;
see New Jersey BMP Manual, Chap. 9)
|
20
|
20
|
|
Infiltration basin
|
80
|
60
|
50
|
|
Manufactured treatment device
|
Pollutant removal rates as certified by NJDEP; see § 164-14.
|
Pollutant removal rates as certified by NJDEP; see § 164-14.
|
Pollutant removal rates as certified by NJDEP; see § 164-14.
|
|
Pervious paving systems
|
80 (porous paving)
|
60
|
50
|
|
80 (permeable pavers with storage bed)
|
60
|
50
| |
|
0 - volume reduction only (permeable pavers
without storage bed)
|
0 - volume reduction only (permeable pavers
without storage bed)
|
0 - volume reduction only (permeable pavers
without storage bed)
| |
|
Sand Filter
|
80
|
50
|
35
|
|
Vegetative filter strip(For filter strips with
multiple vegetated covers, the final TSS removal rate should be based
upon a weighted average of the adopted rates shown in Table 2, based
upon the relative flow lengths through each cover type.)
|
60 (turf grass)
|
30
|
30
|
|
70 (native grasses, meadow and planted woods)
|
30
|
30
| |
|
80 (indigenous woods)
|
30
|
30
| |
|
Wet pond/retention basin
|
50 to 90 (final rate based upon pool volume
and detention time; see NJ BMP Manual)
|
50
|
30
|
|
4 Source: 7:8-5.5(c)
and New Jersey BMP Manual Chapter 4.
|
(6)
Nutrient removal rates for stormwater BMPs. For purposes of postdevelopment nutrient load reduction calculations, Table 2 presents the presumed removal rates for certain BMPs designed in accordance with the New Jersey BMP Manual. If alternative stormwater BMPs are proposed, the applicant shall demonstrate that the selected BMPs will achieve the nutrient removal standard required in § 164-15F.
C.
Methods of calculating groundwater recharge.
(1)
In complying with the groundwater recharge requirements in § 164-15C(1)(a), the design engineer may calculate groundwater recharge in accordance with the New Jersey groundwater recharge spreadsheet (NJGRS) computer program incorporated herein by reference as amended and supplemented. Information regarding the methodology is available in § 164-22A or from the New Jersey BMP Manual.
(2)
Alternative groundwater recharge calculation methods
to meet these requirements may be used upon approval by the Municipal
Engineer.
(3)
In complying with the groundwater recharge requirements in § 164-15C(1)(b), the design engineer shall:
(a)
Calculate stormwater runoff volumes in accordance
with the USDA Natural Resources Conservation Service (NRCS) methodology,
including the NRCS Runoff Equation and Runoff Curve Numbers, as described
in the NRCS National Engineering Handbook Part 630 — Hydrology
and Technical Release 55 — Urban Hydrology for Small Watersheds
as amended and supplemented; and
(b)
Use appropriate two-year, twenty-four-hour rainfall
depths as developed for the project site by the National Oceanic and
Atmospheric Administration, available online at http://hdsc.nws.noaa.gov/hdsc/pfds/index.html.
(4)
When calculating groundwater recharge or stormwater
runoff for predeveloped site conditions, the design engineer shall
use the following criteria:
(a)
When selecting land covers or calculating runoff
curve numbers (CNs) for predeveloped project site conditions, the
project site's land cover shall be assumed to be woods. However, another
land cover may be used to calculate runoff coefficients if:
[1]
Such land cover has existed at the site or portion
thereof without interruption for at least five years immediately prior
to the time of application; and
[2]
The design engineer can document the character
and extent of such land cover through the use of photographs, affidavits,
and/or other acceptable land use records.
(b)
If more than one land cover, other than woods,
has existed on the site during the five years immediately prior to
the time of application, the land cover with the lowest runoff potential
(including woods) shall be used for the computations.
(c)
All predeveloped land covers shall be assumed
to be in good hydrologic condition and, if cultivated, shall be assumed
to have conservation treatment.
A.
Nonstructural stormwater management strategies.
(1)
To the maximum extent practicable, the performance standards in § 164-15 for major development shall be met by incorporating the nine nonstructural strategies identified in Subchapter 5 of the New Jersey Stormwater Management Rules (N.J.A.C. 7:8-5), and set forth in § 164-13C(4)(a), into the design. The applicant shall identify within the land use planning and source control plan required by § 164-13C(4) of this article how each of the nine nonstructural measures will be incorporated into the design of the project to the maximum extent practicable.
(2)
If the applicant contends that it is not practical for engineering, environmental or safety reasons to incorporate any of the nine nonstructural strategies into the design of a particular project, the applicant shall provide a detailed rationale establishing a basis for the contention that use of the strategy is not practical on the site. This rationale shall be submitted in accordance with the checklist requirements established by § 164-13 to the Borough of Folsom. A determination by the Borough of Folsom that this rationale is inadequate or without merit shall result in a denial of the application unless one of the following conditions are met:
(a)
The land use planning and source control plan
is amended to include a description of how all nine nonstructural
measures will be implemented on the development site, and the amended
plan is approved by the Borough of Folsom;
(b)
The land use planning and source control plan is amended to provide an alternative nonstructural strategy or measure that is not included in the list of nine nonstructural measures, but still meets the performance standards in § 164-15, and the amended plan is approved by the Borough of Folsom; or
(c)
The land use planning and source control plan
is amended to provide an adequate rationale for the contention that
use of the particular strategy is not practical on the site, and the
amended plan is approved by the Borough of Folsom.
(3)
In addition to all other requirements of this section,
each applicant shall demonstrate that, at a minimum, existing trees
and vegetation on the development site will be preserved, protected
and maintained according to the minimum standards established by provisions
of the Borough of Folsom Land Use Ordinance, Zoning Ordinance or by
conditions of zoning or variance approval. Existing trees and vegetation
shall be protected during construction activities in accordance with
the Standard for Tree Protection During Construction provided in the
New Jersey State Soil Conservation Committee Standards for Soil Erosion
and Sediment Control in New Jersey, which is incorporated herein by
reference as amended and supplemented.
(4)
In addition to all other requirements of this section,
each application for major development, and any other application
where Folsom otherwise requires a landscaping plan, shall contain
a landscaping or revegetation plan in accordance with the Pinelands
CMP standards at N.J.A.C. 7:50-6.24(c).
(5)
Any land area used as a nonstructural stormwater management measure to meet the performance standards in § 164-15 shall be dedicated to a government entity; shall be subjected to a conservation easement filed with the appropriate county clerk's office; or shall be subjected to an equivalent form of restriction approved by the Borough of Folsom that ensures that that measure or equivalent stormwater management measure is maintained in perpetuity, as detailed in § 164-17 of this article.
(6)
Guidance for nonstructural stormwater management strategies is available in the New Jersey BMP Manual, which may be obtained from the address identified in § 164-23A or found on the NJDEP's Web site at www.njstormwater.org.
(7)
Exception for major development sites creating less than one acre of disturbance. The use of nonstructural strategies to meet the performance standards in § 164-15 of this article is not required for major development creating less than one (1) acre of disturbance. However, the following requirements shall be met:
(a)
Each application for major development and any
other application where the Borough of Folsom otherwise requires a
landscaping plan shall contain a landscaping or revegetation plan
prepared in accordance with the Pinelands CMP standards [N.J.A.C.
7:50-6.24(c)];
(b)
Each applicant shall demonstrate that, at a
minimum, existing trees and vegetation on the development site will
be preserved and protected according to the minimum standards established
by provisions of the Borough of Folsom Land Use Ordinance, Zoning
Ordinance or by conditions of zoning or variance approval; and
(c)
Existing trees and vegetation shall be protected
during construction activities in accordance with the Standard for
Tree Protection During Construction provided in the New Jersey State
Soil Conservation Committee Standards for Soil Erosion and Sediment
Control in New Jersey, which is incorporated herein by reference as
amended and supplemented.
B.
Stormwater runoff quantity and rate standards.
(1)
There shall be no direct discharge of stormwater runoff
from any point or nonpoint source to any wetland, wetlands transition
area or surface waterbody. In addition, stormwater runoff shall not
be directed in such a way as to increase the volume and/or rate of
discharge into any surface water body from that which existed prior
to development of the site.
(2)
To the maximum extent practical, there shall be no
direct discharge of stormwater runoff onto farm fields so as to protect
farm crops from damage due to flooding, erosion and long-term saturation
of cultivated crops and cropland.
(3)
For all major developments, the total runoff volume
generated from the net increase in impervious surfaces by a ten-year,
twenty-four-hour storm shall be retained and infiltrated on site.
(4)
In addition, the design engineer, using the assumptions and factors for stormwater runoff and groundwater recharge calculations contained in § 164-14, shall either:
(a)
Demonstrate through hydrologic and hydraulic
analysis that the postdeveloped stormwater runoff hydrographs from
the project site for the two-, ten- and one-hundred-year storms do
not exceed, at any point in time, the site's pre-developed runoff
hydrographs for the same storms;
(b)
Demonstrate through hydrologic and hydraulic
analysis that under postdeveloped site conditions:
[1]
There is no increase in predeveloped stormwater
runoff rates from the project site for the two-, ten- and one-hundred-year
storms; and
[2]
Any increased stormwater runoff volume or change
in stormwater runoff timing for the two-, ten- and one-hundred-year
storms will not increase flood damage at or downstream of the project
site. When performing this analysis for predeveloped site conditions,
all off-site development levels shall reflect existing conditions.
When performing this analysis for postdeveloped site conditions, all
off-site development levels shall reflect full development in accordance
with current zoning and land use ordinances; or
(c)
Demonstrate that the peak postdeveloped stormwater
runoff rates from the project site for the two-, ten- and one-hundred-year
storms are 50%, 75% and 80%, respectively, of the site's peak predeveloped
stormwater runoff rates for the same storms. Peak outflow rates from
on-site stormwater measures for these storms shall be adjusted where
necessary to account for the discharge of increased stormwater runoff
rates and/or volumes from project site areas not controlled by the
on-site measures. These percentages do not have to be applied to those
portions of the project site that are not proposed for development
at the time of application, provided that such areas are:
C.
Groundwater recharge standards.
(1)
For all major developments, with the exception of those described in § 164-15C(4), below, the design engineer, using the assumptions and factors for stormwater runoff and groundwater recharge calculations contained in § 164-14, shall either:
(a)
Demonstrate through hydrologic and hydraulic
analysis that the postdeveloped project site maintains 100% of the
site's predeveloped average annual groundwater recharge volume; or
(b)
Demonstrate through hydrologic and hydraulic
analysis that any increase in the project site's stormwater runoff
volume for the two-year, twenty-four-hour storm from pre-developed
to postdeveloped conditions is infiltrated on-site.
(2)
The design engineer shall assess the hydraulic impact
on the groundwater table and design the project site and all site
groundwater recharge measures so as to avoid adverse hydraulic impacts.
Adverse hydraulic impacts include, but are not limited to: raising
the groundwater table so as to cause surface ponding; flooding of
basements and other subsurface structures and areas; preventing a
stormwater infiltration basin from completely draining via infiltration
within 72 hours of a design storm event; and interference with the
proper operation of subsurface sewage disposal systems and other surface
and subsurface facilities in the vicinity of the groundwater recharge
measure.
(3)
The standards for groundwater recharge required by this section shall be met using the methods, calculations and assumptions provided in § 164-14.
(4)
Exceptions. The preceding groundwater recharge standards
shall not apply to sites that create less than one acre of disturbance.
D.
Erosion control standards. The minimum design and
performance standards for erosion control are those established under
the Soil Erosion and Sediment Control Act, N.J.S.A. 4:24-39 et seq.,
and its implementing regulations, N.J.A.C. 2:90-1.1 through 1.4.
E.
Stormwater runoff quality standards.
(1)
There shall be no direct discharge of stormwater runoff
from any point or nonpoint source to any wetland, wetland transition
area or surface waterbody.
(2)
Stormwater management measures shall be designed to
reduce the total suspended solids (TSS) load in the stormwater runoff
from the postdeveloped site by 80% expressed as an annual average.
(3)
Stormwater management measures shall also be designed
to reduce the nutrient load in the stormwater runoff from the postdeveloped
site by the maximum extent practicable. In achieving this reduction,
the design of the development site shall include nonstructural and
structural stormwater management measures that optimize nutrient removal
while still achieving the groundwater recharge, runoff quantity and
rate, and TSS removal standards in this section.
(4)
The standards for stormwater runoff quality required by this section shall be met using the methods, calculations, assumptions and pollutant removal rates provided in § 164-14.
(5)
Exceptions.
(b)
The TSS reduction requirement in § 164-15F(2) shall not apply to any stormwater runoff in a discharge regulated under a numeric effluent limitation for TSS imposed under the NJPDES rules (N.J.A.C. 7:14A) or in a discharge specifically exempt under a NJPDES permit from this requirement.
F.
Additional stormwater quality standards for high pollutant
loading areas and areas where stormwater runoff is exposed to source
material.
(2)
For a major development in areas described in Subsection F(1)(a) or F(1)(b) above, in addition to the infiltration requirements specified in § 164-15B(2) and the groundwater recharge requirements specified in § 164-15C, the applicant shall demonstrate in the land use planning and source control plan required in § 164-13C(4) that the following requirements have been met:
(b)
The stormwater runoff from the areas described in Subsections F(1)(a) and F(1)(b) above is segregated to the maximum extent practicable from the stormwater runoff generated from the remainder of the site such that commingling of the stormwater runoff from the areas described in Subsections F(1)(a) and F(1)(b) above and the remainder of the site will be minimized;
(d)
The stormwater runoff from or commingled with the areas described in Subsections F(1)(a) and F(1)(b) above for the water quality design storm, defined in § 164-14B Table 1, shall be subject to pretreatment by one or more of the following stormwater BMPs, designed in accordance with the New Jersey BMP Manual to provide ninety-percent TSS removal:
[1]
Bioretention system;
[2]
Sand filter;
[3]
Wet ponds which shall be hydraulically disconnected
by a minimum of two feet of vertical separation from the seasonal
high water table and shall be designed to achieve a minimum eighty-percent
TSS removal rate;
[4]
Constructed stormwater wetlands; and/or
[5]
Media filtration system manufactured treatment
device with a minimum eighty-percent TSS removal as verified by the
New Jersey Corporation for Advanced Technology and as certified by
NJDEP.
(e)
If the potential for contamination of stormwater runoff by petroleum products exists on site, prior to being conveyed to the pretreatment BMP required in § 164-15D(2)(d) above, the stormwater runoff from the areas described in Subsections F(1)(a) and F(1)(b) above shall be conveyed through an oil/grease separator or other equivalent manufactured filtering device to remove the petroleum hydrocarbons. The applicant shall provide the reviewing agency with sufficient data to demonstrate acceptable performance of the device.
G.
Threatened and endangered species and associated habitat
standards. Stormwater management measures shall address the impacts
of the development on habitat for threatened and endangered species,
in accordance with N.J.A.C. 7:8-5.2(c), N.J.A.C. 7:50-6.27, and 7:50-6.33
and 34.
H.
Exceptions and mitigation requirements.
(1)
Exceptions from strict compliance from the groundwater
recharge, stormwater runoff quantity, and stormwater runoff quality
requirements established by this article may be granted, at the discretion
of the Borough of Folsom and subject to approval by the Pinelands
Commission, provided that all of the following conditions are met:
(a)
The exception is consistent with that allowed
by the Borough of Folsom;
(b)
The Borough of Folsom has an adopted and effective
municipal stormwater management plan in accordance with N.J.A.C. 7:8-4.4,
which includes a mitigation plan in accordance with N.J.A.C. 7:8-4.2(c)
11, and is also certified by the Pinelands Commission. The mitigation
plan shall identify what measures are necessary to offset the deficit
created by granting the exception, and the municipality shall submit
a written report to the county review agency and the NJDEP describing
the exception, and the required mitigation. Guidance for developing
municipal stormwater management plans, including mitigation plans,
is available from the NJDEP, Division of Watershed Management, and
the New Jersey BMP Manual.
(c)
The applicant demonstrates that mitigation, in addition to the requirements of mitigation plan discussed in Subsection H(1)(b) above, will be provided consistent with one of the following options:
[1]
Mitigation may be provided off site, but within
the Pinelands Area and within the same drainage area as the development
site, and shall meet or exceed the equivalent recharge, quality or
quantity performance standard which is lacking on the development
site due to the exception; or
[2]
In lieu of the required mitigation, a monetary
in lieu contribution may be provided by the applicant to the Borough
of Folsom in accordance with the following:
[a]
The amount of the in lieu contribution
shall be determined by the Borough of Folsom, but the maximum in lieu
contribution required shall be equivalent to the cost of implementing
and maintaining the stormwater management measure(s) for which the
exception is granted;
[b]
The in lieu contribution shall be used to fund an off-site stormwater control mitigation project(s) located within the Pinelands Area, within the same drainage area as the development site, and shall meet or exceed the equivalent recharge, quality or quantity performance standard which is lacking on the development site. Such mitigation project shall be identified by Folsom in the Borough of Folsom's adopted municipal stormwater management plan. The stormwater control project to which the monetary contribution will be applied shall be identified by the Borough of Folsom at the time the exception is granted. The applicant shall amend the project description and site plan required in § 164-13C(3) to incorporate a description of both the standards for which an on-site exception is being granted and of the selected off-site mitigation project.
[c]
The Borough of Folsom shall expend
the in lieu contribution to implement the selected off-site mitigation
project within five years from the date that payment is received.
Should the Borough of Folsom fail to expend the in lieu contribution
within the required time frame, the mitigation option provided in
§ 164-15H(1)(c)[3] of this article shall be void and the
Borough of Folsom shall be prohibited from collecting in lieu contributions.
(2)
An exception from strict compliance granted in accordance with Subsection H(1) above shall not constitute a waiver of strict compliance from the requirements of the Pinelands Comprehensive Management Plan at N.J.A.C. 7:50. An applicant should contact the Pinelands Commission to determine whether a waiver of strict compliance is also required in accordance with N.J.A.C. 7:50, Subchapter 4, Part V.
A.
General design and construction standards.
(1)
Structural stormwater management measures shall be
designed to meet the standards established in this section. These
standards have been developed to protect public safety, conserve natural
features, create an aesthetically pleasing site and promote proper
on site stormwater management.[1]
[1]
Note: Though not required by N.J.A.C. 7:8,
pursuant to their authority, municipalities may have the option to
require existing basins that pose a public health or safety hazard
to be retrofitted to comply with the standards in this subsection.
(2)
The following structural stormwater management measures
may be utilized as part of a stormwater management system at a major
land development in the Pinelands, provided that the applicant demonstrates
that they are designed, constructed and maintained so as to meet the
standards and requirements established by this article. If alternative
stormwater management measures are proposed, the applicant shall demonstrate
that the selected measures will achieve the standards established
by this article.
(a)
Bioretention systems;
(b)
Constructed stormwater wetlands;
(c)
Extended detention basins;
(d)
Infiltration basins;
(e)
Vegetated filter strips;
(f)
Infiltration basins and trenches;
(g)
Wet ponds with suitable liners;
(h)
Pervious paving systems; and
(i)
Manufactured treatment devices, provided their
pollutant removal rates are verified by the New Jersey Corporation
for Advanced Technology and certified by the NJDEP.
(3)
Structural stormwater management measures shall be
designed to take into account the existing site conditions, including
environmentally critical areas, wetlands, flood-prone areas, slopes,
depth to seasonal high water table, soil type, permeability and texture,
and drainage area and drainage patterns.
(4)
Structural stormwater management measures shall be
designed and constructed to be strong, durable, and corrosion-resistant
(measures that are consistent with the relevant portions of the Residential
Site Improvement Standards at N.J.A.C. 5:21-7.3, 7.4, and 7.8 shall
be deemed to meet this requirement); to minimize and facilitate maintenance
and repairs; and to ensure proper functioning.
(5)
For all stormwater management measures at a development site, each applicant shall submit a detailed inspection, maintenance and repair plan consistent with the requirements of § 164-16 of this article.
(6)
To the maximum extent practicable, the design engineer
shall design structural stormwater management measures on the development
site in a manner that:
(a)
Limits site disturbance, maximizes stormwater
management efficiencies, and maintains or improves aesthetic conditions;
(b)
Utilizes multiple stormwater management measures,
smaller in size and distributed spatially throughout the land development
site, instead of a single larger structural stormwater management
measure;
(c)
Incorporates pretreatment measures. Pretreatment
can extend the functional life and increase the pollutant removal
capability of a structural stormwater management measure. Pretreatment
measures may be designed in accordance with the New Jersey BMP Manual
or other sources approved by the Municipal Engineer.
(7)
Stormwater management basins shall be designed in
a manner that complements and mimics the existing natural landscape,
including but not limited to the following design strategies:
(a)
Use of natural, nonwetland wooded depressions
for stormwater runoff storage; and
(b)
Establishment of attractive landscaping in and
around the basin that mimics the existing vegetation and incorporates
native Pinelands plants, including, but not limited to, the species
listed in N.J.A.C. 7:50-6.25 and 6.26.
(8)
Stormwater management basins shall be designed with
gently sloping sides. The maximum allowable basin side slope shall
be three horizontal to one vertical (3:1).
(9)
Guidance on the design and construction of structural
stormwater management measures may be found in the New Jersey BMP
Manual. Other guidance sources may also be used upon approval by the
Municipal Engineer.
(10)
After all construction activities and required
field testing have been completed on the development site, as-built
plans depicting design and as-built elevations of all stormwater management
measures shall be prepared by a licensed land surveyor and submitted
to the Municipal Engineer. Based upon the Municipal Engineer's review
of the as-built plans, all corrections or remedial actions deemed
by the Municipal Engineer to be necessary due to the failure to comply
with the standards established by this article and/or any reasons
of public health or safety shall be completed by the applicant. In
lieu of review by the Municipal Engineer, Folsom reserves the right
to engage a professional engineer to review the as-built plans. The
applicant shall pay all costs associated with such review.
B.
Design and construction standards for stormwater infiltration
BMPs.
(1)
Stormwater infiltration BMPs, such as bioretention
systems with infiltration, dry wells, infiltration basins, pervious
paving systems with storage beds, and sand filters with infiltration,
shall be designed, constructed and maintained to completely drain
the total runoff volume generated by the basin's maximum design storm
within 72 hours after a storm event. Runoff storage for greater times
can render the BMP ineffective and may result in anaerobic conditions,
odor, and both water quality and mosquito breeding problems.
(2)
Stormwater infiltration BMPs shall be designed, constructed
and maintained to provide a minimum separation of at least two feet
between the elevation of the lowest point of the bottom of the infiltration
BMP and the seasonal high water table.
(3)
A stormwater infiltration BMP shall be sited in suitable
soils verified by field testing to have permeability rates between
one and 20 inches per hour. If such site soils do not exist or if
the design engineer demonstrates that it is not practical for engineering,
environmental or safety reasons to site the stormwater infiltration
BMP(s) in such soils, then the stormwater infiltration BMP(s) may
be sited in soils verified by field testing to have permeability rates
in excess of 20 inches per hour, provided that a bioretention system,
designed, installed and maintained in accordance with the New Jersey
BMP Manual, is installed to meet one of the following conditions:
(a)
The bioretention system is constructed as a
separate measure designed to provide pretreatment of stormwater and
to convey the pretreated stormwater into the infiltration BMP; or
(b)
The bioretention system is integrated into and
made part of the infiltration BMP and, as such, does not require an
underdrain system. If this option is selected, the infiltration BMP
shall be designed and constructed so that the maximum water depth
in the bioretention system portion of the BMP during treatment of
the stormwater quality design storm is 12 inches in accordance with
the New Jersey BMP Manual.
(4)
The minimum design permeability rate for the soil within a BMP that relies on infiltration shall be 1/2 inch per hour. A factor of safety of two shall be applied to the soil's field-tested permeability rate to determine the soil's design permeability rate. For example, if the field-tested permeability rate of the soil is four inches per hour, its design permeability rate would be two inches per hour. The minimum design permeability rate for the soil within a stormwater infiltration basin shall also be sufficient to achieve the minimum seventy-two-hour drain time described in Subsection B(1) above. The maximum design permeability shall be 10 inches per hour.
(5)
A soil's field-tested permeability rate shall be determined
in accordance with the following:
(a)
The predevelopment field test permeability rate shall be determined according to the methodologies provided in § 164-22C(3) of this article;
(b)
The results of the required field permeability
tests shall demonstrate a minimum tested infiltration rate of one
inch per hour;
(c)
After all construction activities have been completed on the site and the finished grade has been established in the infiltration BMP, postdevelopment field permeability tests shall also be conducted according to the methodologies provided in § 164-22C(3) of this article;
(d)
If the results of the postdevelopment field permeability tests fail to achieve the minimum required design permeability rates in Subsection B(4) above utilizing a factor of safety of two, the stormwater infiltration BMP shall be renovated and retested until such minimum required design permeability rates are achieved; and
(e)
The results of all field permeability tests
shall be certified by a professional engineer and transmitted to the
Municipal Engineer.
(6)
To help ensure maintenance of the design permeability
rate over time, a six-inch layer of K5 soil shall be placed on the
bottom of a stormwater infiltration BMP. This soil layer shall meet
the textural and permeability specifications of a K5 soil as provided
at N.J.A.C. 7:9A, Appendix A, Figure 6, and be certified to meet these
specifications by a professional engineer licensed in the State of
New Jersey. The depth to the seasonal high water table shall be measured
from the bottom of the K5 sand layer.
(7)
The design engineer shall assess the hydraulic impact
on the groundwater table and design the project site and all stormwater
infiltration basins so as to avoid adverse hydraulic impacts. Adverse
hydraulic impacts include, but are not limited to: raising the groundwater
table so as to cause surface ponding; flooding of basements and other
subsurface structures and areas; preventing a stormwater infiltration
basin from completely draining via infiltration within 72 hours of
a design storm event; and interference with the proper operation of
subsurface sewage disposal systems and other surface and subsurface
structures in the vicinity of the stormwater infiltration basin.
(8)
The design engineer shall conduct a mounding analysis, as defined in § 164-18, of all stormwater infiltration BMPs. The mounding analysis shall be conducted in accordance with the requirements in § 164-22C(3)(l). Where the mounding analysis identifies adverse impacts, the stormwater infiltration BMP shall be redesigned or relocated, as appropriate.
(9)
Stormwater infiltration BMPs shall be constructed
in accordance with the following:
(a)
To avoid sedimentation that may result in clogging
and reduce the basin's permeability rate, stormwater infiltration
basins shall be constructed according to the following:
[1]
Unless the conditions in Subsection B(9)(a)[2] below are met, a stormwater infiltration basin shall not be placed into operation until its drainage area is completely stabilized. Instead, upstream runoff shall be diverted around the basin and into separate, temporary stormwater management facilities and sediment basins. Such temporary facilities and basins shall be installed and utilized for stormwater management and sediment control until stabilization is achieved in accordance with the Standards for Soil Erosion and Sediment Control in New Jersey, which is incorporated herein by reference as amended and supplemented.
[2]
If the design engineer determines that, for engineering, environmental or safety reasons, temporary stormwater management facilities and sediment basins cannot be constructed on the site, the stormwater infiltration basin may be placed into operation prior to the complete stabilization of its drainage area, provided that the basin's bottom during this period is constructed at a depth at least two feet higher than its final design elevation. All other infiltration BMP construction requirements in this section shall be followed. When the drainage area is completely stabilized, all accumulated sediment shall be removed from the infiltration BMP, which shall then be excavated to its final design elevation in accordance with the construction requirements of this section and the performance standards in § 164-15.
(b)
To avoid compaction of subgrade soils of BMPs that rely on infiltration, no heavy equipment such as backhoes, dump trucks or bulldozers shall be permitted to operate within the footprint of the BMP. All excavation required to construct a stormwater infiltration BMP shall be performed by equipment placed outside the BMP. If this is not possible, the soils within the excavated area shall be renovated and tilled after construction is completed to reverse the effects of compaction. In addition, postdevelopment soil permeability testing shall be performed in accordance with Subsection B(5) of this section.
(c)
Earthwork associated with stormwater infiltration
BMP construction, including excavation, grading, cutting or filling,
shall not be performed when soil moisture content is above the lower
plastic limit.
C.
Safety standards for structural stormwater management
measures.
(1)
If a structural stormwater management measure has
an outlet structure, escape provisions shall be incorporated in or
on the structure. Escape provisions means the permanent installation
of ladders, steps, rungs, or other features that provide readily accessible
means of ingress and egress from the outlet structure.
(2)
A trash rack is a device intended to intercept runoff-borne
trash and debris that might otherwise block the hydraulic openings
in an outlet structure of a structural stormwater management measure.
Trash racks shall be installed upstream of such outlet structure openings
as necessary to ensure proper functioning of the structural stormwater
management measure in accordance with the following:
(a)
The trash rack should be constructed primarily
of bars aligned in the direction of flow 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 bars shall be spaced
no greater than 1/3 the width of the hydraulic opening it is protecting
or six inches, whichever is less. Transverse bars aligned perpendicular
to flow should be sized and spaced as necessary for rack stability
and strength.
(b)
The trash rack shall not adversely affect the
hydraulic performance of either the outlet structure opening it is
protecting or the overall outlet structure.
(c)
The trash rack shall have sufficient net open
area under clean conditions to limit the peak design storm velocity
through it to a maximum of 2.5 feet per second.
(d)
The trash rack shall be constructed and installed
to be rigid, durable, and corrosion-resistant, and shall be designed
to withstand a perpendicular live loading of 300 pounds per square
foot.
(3)
An overflow grate is a device intended to protect
the opening in the top of a stormwater management measure outlet structure.
If an outlet structure has an overflow grate, such grate shall meet
the following requirements:
(a)
The overflow grate shall be secured to the outlet
structure but removable for emergencies and maintenance;
(b)
The overflow grate spacing shall be no more
than two inches across the smallest dimension; and
(c)
The overflow grate shall be constructed and
installed to be rigid, durable, and corrosion resistant, and shall
be designed to withstand a perpendicular live loading of 300 pounds
per square foot.
(4)
The maximum side slope for an earthen dam, embankment
or berm shall not be steeper than three (3) horizontal to one (1)
vertical (3:1).
(5)
Safety ledges shall be constructed on the slopes of
all new structural stormwater management measures having a permanent
pool of water deeper than 2 1/2 feet. Such safety ledges shall
be comprised of two steps. Each step shall be four to six feet in
width. One step shall be located approximately 2 1/2 feet below
the permanent water surface, and the second step shall be located
one to 1 1/2 feet above the permanent water surface. See below,
for an illustration of safety ledges in a stormwater management basin.
(a)
Illustration of safety ledges.
 | |
|---|---|
|
Source: N.J.A.C. 7:8-6 Appendix A.
|
B.
General inspection, maintenance and repair plan.
(1)
The design engineer shall prepare an inspection, maintenance and repair plan for the stormwater management measures, including both structural and nonstructural measures incorporated into the design of a major development. This plan shall be submitted as part of the checklist requirements established in § 164-13C. Inspection and maintenance guidelines for stormwater management measures are available in the New Jersey BMP Manual.
(2)
The inspection, maintenance and repair plan shall
contain the following:
(a)
Accurate and comprehensive drawings of the site's
stormwater management measures;
(b)
Specific locations of each stormwater management
measure identified by means of longitude and latitude as well as block
and lot number;
(c)
Specific preventative and corrective maintenance
tasks and schedules for such tasks for each stormwater BMP;
(d)
Cost estimates, including estimated cost of
sediment, debris or trash removal; and
(e)
The name, address and telephone number of the
person or persons responsible for regular inspections and preventative
and corrective maintenance (including repair and replacement). If
the responsible person or persons is a corporation, company, partnership,
firm, association, municipality or political subdivision of this state,
the name and telephone number of an appropriate contact person shall
also be included.
(3)
The person responsible for inspection, maintenance and repair identified under Subsection B(2) above shall maintain a detailed log of all preventative and corrective maintenance performed for the site's stormwater management measures, including a record of all inspections and copies of all maintenance-related work orders in the inspection, maintenance and repair plan. Said records and inspection reports shall be retained for a minimum of five years.
(4)
If the inspection, maintenance and repair plan identifies
a person other than the developer (for example, a public agency or
homeowners' association) as having the responsibility for inspection
and maintenance, the plan shall include documentation of such person's
agreement to assume this responsibility, or of the developer's obligation
to dedicate a stormwater management measure to such person under an
applicable ordinance or regulation.
(5)
If the person responsible for inspection, maintenance and repair identified under Subsection B(2) above is not a public agency, the maintenance plan and any future revisions based on Subsection B(6) below shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan shall be undertaken.
(6)
The person responsible for inspection, maintenance and repair identified under Subsection B(2) above shall evaluate the effectiveness of the inspection, maintenance and repair plan at least once per year and update the plan and the deed as needed.
(8)
The person responsible for inspection, maintenance and repair identified under Subsection B(2) above shall retain and make available, upon request by any public entity with administrative, health, environmental or safety authority over the site the inspection, maintenance and repair plan and the documentation required by Subsections B(2) and B(3) above.
C.
Responsibility for inspection, repair and 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.
D.
Preventative and corrective maintenance shall be performed
to maintain the function of the stormwater management measure, including,
but not limited to: repairs or replacement to any associated appurtenance
of the measure; removal of sediment, debris or trash; restoration
of eroded areas; snow and ice removal; fence repair or replacement;
restoration of vegetation; repair or replacement of linings; and restoration
of infiltration function.
E.
Stormwater management measure easements shall be provided
by the property owner as necessary for facility inspections and maintenance
and preservation of stormwater runoff conveyance, infiltration, and
detention areas and facilities. The purpose of the easement shall
be specified in the maintenance agreement.
F.
In the event that the stormwater management measure
becomes a public health nuisance or danger to public safety or public
health, or if it is in need of maintenance or repair, the Borough
of Folsom 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 the Municipal Engineer's
designee. The Borough of Folsom, at 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 within the allowable time, Folsom may immediately proceed
to do so with its own forces and equipment and/or through contractors.
The costs and expenses of such maintenance and repair by the Borough
of Folsom shall be entered on the tax roll as a special charge against
the property and collected with any other taxes levied thereon for
the year in which the maintenance and repair was performed.
G.
Requirements for inspection, maintenance and repair
of stormwater BMPs that rely on infiltration. If a stormwater infiltration
BMP is incorporated into the design of a major development, the applicant
shall include the following requirements in its inspection, maintenance
and repair plan:
(1)
Once per month (if needed): Mow side slopes, remove
litter and debris, stabilize eroded banks, repair erosion at inflow
structure(s);
(2)
After every storm exceeding one inch of rainfall:
Ensure that infiltration BMPs drain completely within 72 hours after
the storm event. If stored water fails to infiltrate 72 hours after
the end of the storm, corrective measures shall be taken. Raking or
tilling by light equipment can assist in maintaining infiltration
capacity and break up clogged surfaces;
(3)
Four times per year (quarterly): Inspect stormwater
infiltration BMPs for clogging and excessive debris and sediment accumulation
within the BMP, remove sediment (if needed) when completely dry;
(4)
Two times per year: Inspect for signs of damage to
structures, repair eroded areas, check for signs of petroleum contamination
and remediate;
(5)
Once per year: Inspect BMPs for unwanted tree growth
and remove if necessary, disc or otherwise aerate bottom of infiltration
basin to a minimum depth of six inches; and
(6)
After every storm exceeding one inch of rainfall,
inspect and, if necessary, remove and replace K5 sand layer and accumulated
sediment to restore original infiltration rate.
(7)
Additional guidance for the inspection, maintenance
and repair of stormwater infiltration BMPs can be found in the New
Jersey BMP Manual.
H.
Financing of inspection, maintenance and repair of
stormwater BMPs. An adequate means of ensuring permanent financing
of the inspection, maintenance and repair of stormwater BMPs shall
be implemented and detailed in the inspection, maintenance and repair
plan. Permanent financing of the inspection, maintenance and repair
of stormwater BMPs shall be accomplished by:
Unless specifically defined below, words or
phrases used in this article shall be interpreted so as to give them
the meaning they have in common usage and to give this article its
most reasonable application. When used in this article, the following
terms shall have the meanings herein ascribed to them:
The Planning Board, Zoning Board of Adjustment or other board,
agency or official of the Borough of Folsom with authority to approve
or disapprove subdivisions, site plans, construction permits, building
permits or other applications for development approval. For the purposes
of reviewing development applications and ensuring compliance with
the requirements of this article, Folsom may designate the Municipal
Engineer or other qualified designee to act on behalf of the Borough
of Folsom.
The propagation, rearing and subsequent harvesting of aquatic
organisms in controlled or selected environments, and their subsequent
processing, packaging and marketing, including, but not limited to,
activities to intervene in the rearing process to increase production,
such as stocking, feeding, transplanting and providing for protection
from predators.
Either a written statement signed and sealed by a licensed
New Jersey professional engineer attesting that a BMP design or stormwater
management system conforms to or meets a particular set of standards
or to action taken by the Commission pursuant to N.J.A.C. 7:50-3,
Part II or Part IV. Depending upon the context in which the term is
use, the terms "certify" and "certified" shall be construed accordingly.
The increase in soil bulk density caused by subjecting soil
to greater-than-normal loading. Compaction can also decrease soil
infiltration and permeability rates.
The construction, erection, reconstruction, alteration, conversion,
demolition, removal or equipping of buildings, structures or components
of a stormwater management system, including but not limited to collection
inlets, stormwater piping, swales and all other conveyance systems,
and stormwater BMPs.
An agency designated by the County Board of Chosen Freeholders
to review municipal stormwater management plans and implementing ordinance(s).
The county review agency may either be:
A person professionally qualified and duly licensed in New
Jersey to perform engineering services that may include, but not necessarily
be limited to, development of project requirements, creation and development
of project design and preparation of drawings and specifications.
The tested permeability rate with a factor of safety of two
applied to it (e.g., if the tested permeability rate of the soils
is four inches per hour, the design rate would be two inches per hour).
The change of or enlargement of any use or disturbance
of any land, the performance of any building or mining operation,
the division of land into two or more parcels, and the creation or
termination of rights of access or riparian rights, including, but
not limited to:
A change in type of use of a structure or land;
A reconstruction, alteration of the size, or
material change in the external appearance of a structure or land;
A material increase in the intensity of use
of land, such as an increase in the number of businesses, manufacturing
establishments, offices or dwelling units in a structure or on land;
Commencement of resource extraction or drilling
or excavation on a parcel of land;
Demolition of a structure or removal of trees;
Commencement of forestry activities;
Deposit of refuse, solid or liquid waste or
fill on a parcel of land;
In connection with the use of land, the making
of any material change in noise levels, thermal conditions, or emissions
of waste material; and
Alteration, either physically or chemically,
of a shore, bank or floodplain, seacoast, river, stream, lake, pond,
wetlands or artificial body of water.
In the case of development on agricultural land,
i.e., lands used for an agricultural use or purpose as defined at
N.J.A.C. 7:50-2.11, development means: any activity that requires
a state permit; any activity reviewed by the County Agricultural Boards
(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.
Any division of land into five or more lots; any construction
or expansion of any housing development of five or more dwelling units;
any construction or expansion of any commercial or industrial use
or structure on a site of more than three acres; or any development,
grading, clearing or disturbance of an area in excess of 5,000 square
feet. Disturbance for the purpose of this article is the placement
of impervious surface or exposure and/or movement of soil or bedrock
or clearing, cutting or removing of vegetation.
All development other than major development.
A geographic area within which stormwater, sediments, or
dissolved materials drain to a BMP, a stormwater management system,
a particular receiving water body or a particular point along a receiving
water body.
An area or feature which is of significant environmental
value, including but not limited to: stream corridors; natural heritage
priority sites; habitat of endangered or threatened animal species;
threatened or endangered plants of the Pinelands pursuant to N.J.A.C.
7:5-6.27(a); large areas of contiguous open space or upland forest;
steep slopes; and wellhead protection and groundwater recharge areas.
T & E habitat constitutes habitat that is critical for the survival
of a local population of threatened and endangered species or habitat
that is identified using the Department's Landscape Project as approved
by the Department's Endangered and Nongame Species Program, whichever
is more inclusive. Threatened and endangered wildlife shall be protected
in conformance with N.J.A.C. 7:50-6.33.
The approval by the approving authority of a variance or
other material departure from strict compliance with any section,
part, phrase or provision of this article. An exception may be granted
only under certain specific, narrowly-defined conditions described
herein and does not constitute a waiver of strict compliance with
any section, part, phrase or provision of the Pinelands Comprehensive
Management Plan (N.J.A.C. 7:50-1.1 et seq.).
A facility constructed through filling and/or excavation
that provides temporary storage of stormwater runoff. It has an outlet
structure that detains and attenuates runoff inflows and promotes
the settlement of pollutants. An extended detention basin is normally
designed as a multistage facility that provides runoff storage and
attenuation for both stormwater quality and quantity management. The
term "stormwater detention basin" shall have the same meaning as "extended
detention basin."
The elevation of the surface of the ground after completion
of final grading, either via cutting, filling or a combination thereof.
Modification of a land slope by cutting and filling with
the native soil or redistribution of the native soil which is present
at the site.
Water below the land surface in a zone of saturation.
A test performed to demonstrate that the groundwater below
a stormwater infiltration basin will not "mound up," encroach on the
unsaturated zone, break the surface of the ground at the infiltration
area or downslope, and create an overland flow situation.
Equipment, machinery, or vehicles that exert ground pressure
in excess of eight pounds per square inch.
An area in an industrial or commercial development site:
where solvents and/or petroleum products are loaded/unloaded, stored
or applied; where pesticides are loaded/unloaded or stored; 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; where recharge would be inconsistent
with NJDEP-approved remedial action work plan or landfill closure
plan; and/or where a high risk exists for spills of toxic materials,
such as gas stations and vehicle maintenance facilities. The term
"HPLA" shall have the same meaning as "high pollutant loading area."
A surface that has been covered with a layer of material
so that it is highly resistant to infiltration by water.
The process by which precipitation enters the soil through
its surface.
A monetary fee collected by the Borough of Folsom in lieu
of requiring strict on-site compliance with the groundwater recharge,
stormwater runoff quantity and/or stormwater runoff quality standards
established in this article.
To assemble, construct, put in place or connect components
of a stormwater management system.
Acts necessary to prevent, limit, remedy or compensate for
conditions that may result from those cases where an 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 a local
ordinance which is as protective as N.J.A.C. 7:8, and an exception
from strict compliance is granted by the Borough of Folsom and the
Pinelands Commission.
Guidance developed by the New Jersey Department of Environmental
Protection, in coordination with the New Jersey Department of Agriculture,
the New Jersey Department of Community Affairs, the New Jersey Department
of Transportation, Municipal Engineers, county engineers, consulting
firms, contractors and environmental organizations to address the
standards in the New Jersey Stormwater Management Rules, N.J.A.C.
7:8. The BMP Manual provides examples of ways to meet the standards
contained in the rule. An applicant may demonstrate that other proposed
management practices will also achieve the standards established in
the rules. The manual, and notices regarding future versions of the
manual, are available from the Division of Watershed Management, NJDEP,
PO Box 418, Trenton, New Jersey 08625; and on the NJDEP's Web site,
www.njstormwater.org. The term "New Jersey BMP Manual" shall have
the same meaning as "New Jersey Stormwater Best Management Practices
Manual."
The New Jersey Department of Environmental Protection.
The New Jersey Pollutant Discharge Elimination System as
set forth in N.J.S.A. 58:10A-1 et seq., and in N.J.A.C. 7:14A.
A permit issued by the NJDEP pursuant to the authority of
the Water Pollution Control Act, N.J.S.A. 58:10A-1 et seq., and N.J.A.C.
7:14A, for a discharge of pollutants.
Any human-made or human-induced activity, factor
or condition, other than a point source, from which pollutants are
or may be discharged;
Any human-made or human-induced activity, factor
or condition, other than a point source, that may temporarily or permanently
change any chemical, physical, biological, or radiological characteristic
of waters of the state from what was or is the natural, pristine condition
of such waters, or that may increase the degree of such change; or
Any activity, factor or condition, other than
a point source, that contributes or may contribute to water pollution.
The term "NPS" shall have the same meaning as
"nonpoint source."
A stormwater management measure, strategy or combination
of strategies that reduces adverse stormwater runoff impacts through
sound site planning and design. Nonstructural BMPs include such practices
as minimizing site disturbance, preserving important site features,
reducing and disconnecting impervious cover, flattening slopes, utilizing
native vegetation, minimizing turf grass lawns, maintaining natural
drainage features and characteristics, and controlling stormwater
runoff and pollutants closer to the source. The term "low-impact development
technique" shall have the same meaning as "nonstructural BMP."
A chemical element or compound, such as nitrogen or phosphorus,
which is essential to and promotes the development of organisms.
The rate at which water moves through a saturated unit area
of soil or rock material at hydraulic gradient of one, determined
as prescribed in N.J.A.C. 7:9A-6.2 (tube permeameter test), N.J.A.C.
6.5 (pit bailing test) or N.J.A.C. 6.6 (piezometer test). Alternative
permeability test procedures may be accepted by the approving authority,
provided the test procedure attains saturation of surrounding soils,
accounts for hydraulic head effects on infiltration rates, provides
a permeability rate with units expressed in inches per hour and is
accompanied by a published source reference. Examples of suitable
sources include hydrogeology, geotechnical, or engineering text and
design manuals, proceedings of American Society for Testing and Materials
(ASTM) symposia, or peer-review journals. Neither a soil permeability
class rating test, as described in N.J.A.C. 7:9A-6.3, nor a percolation
test, as described in N.J.A.C. 7:9A-6.4, are acceptable tests for
establishing permeability values for the purpose of complying with
this article.
Having a permeability of one inch per hour or faster. The
terms "permeable soil," "permeable rock" and "permeable fill" shall
be construed accordingly.
Any individual, corporation, company, partnership, firm,
association, municipality or political subdivision of this state subject
to municipal jurisdiction pursuant to the Municipal Land Use Law,
N.J.S.A. 40:55D-1 et seq.
The Commission created pursuant to Section 5 of the Pinelands
Protection Act, N.J.S.A. 13:18A-5.
The New Jersey Pinelands Comprehensive Management Plan (N.J.A.C.
7:50 1.1 et seq.).
Any discernible, confined, and discrete conveyance, including,
but not limited to, any pipe, ditch, channel, tunnel, conduit, well,
discrete fissure, container, rolling stock, concentrated animal feeding
operation, landfill leachate collection system, vessel or other floating
craft, from which pollutants are or may be discharged. This term does
not include return flows from irrigated agriculture.
Any dredged spoil, solid waste, incinerator residue, filter
backwash, sewage, garbage, refuse, oil, grease, sewage sludge, munitions,
chemical wastes, biological materials, medical wastes, radioactive
substances [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, suspended solids, 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.
A person licensed to practice professional engineering in
the State of New Jersey pursuant to N.J.S.A. 48:8-27 et seq.
The amount of water from precipitation that infiltrates into
the ground and is not evapotranspired.
One of two or more soil samples or tests taken at the same
location (within five feet of each other) and depth within the same
soil horizon or substratum. In the case of fill material, replicate
tests are tests performed on subsamples of the same bulk sample packed
to the same bulk density.
A particle size category consisting of mineral particles which are between 0.05 and 2.0 millimeters in equivalent spherical diameter. Also, a soil textural class having 85% or more of sand and a content of silt and clay such that the percentage of silt plus 1.5 times the percentage of clay does not exceed 15, as shown in § 164-22C(1) (USDA Soil Textural Triangle).
The upper limit of the shallowest zone of saturation which
occurs in the soil, identified as prescribed in N.J.A.C. 7:9A-5.8.
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
which is not a rock substratum, including sediments below the biologically
active and/or weathered zones.
Any material(s) or machinery, located at an industrial facility,
that is directly or indirectly related to process, manufacturing or
other industrial activities, which could be a source of pollutants
in any industrial stormwater discharge to groundwater. Source materials
include, but are not limited to, raw materials; intermediate products;
final products; waste materials; by-products; industrial machinery
and fuels, and lubricants, solvents and detergents that are related
to process, manufacturing or other industrial activities that are
exposed to stormwater.
Water resulting from precipitation (including rain and snow)
that runs off the land's surface, is transmitted to the subsurface,
or is captured by separate storm sewers or other sewage or drainage
facilities, or conveyed by snow removal equipment.
A basin or other facility constructed within permeable soils
that provides temporary storage of stormwater runoff. An infiltration
BMP does not normally have a structural outlet to discharge runoff
from the stormwater quality design storm. Instead, outflow from an
infiltration BMP is through the surrounding soil. The terms "infiltration
measure" and "infiltration practice" shall have the same meaning as
"stormwater infiltration basin."
Any structural or nonstructural strategy, practice, technology,
process, program or other method intended to control or reduce stormwater
runoff and associated pollutants, or to induce or control the infiltration
or groundwater recharge of stormwater or to eliminate illicit or illegal
nonstormwater discharges into stormwater conveyances. This includes,
but is not limited to, structural and nonstructural stormwater best
management practices described in the New Jersey BMP Manual and designed
to meet the standards for stormwater control contained within this
article. The terms "stormwater best management practice" and "stormwater
BMP" shall have the same meaning as "stormwater management measure."
Water flow on the surface of the ground or in storm sewers,
resulting from precipitation.
Unsaturated soil, above the seasonally high water table,
which contains less than 50% by volume of coarse fragments and which
has a tested permeability rate of between one and 20 inches per hour.
Any waters of the state which are not groundwater.
The time it takes for runoff to travel from the hydraulically
most distant point of the drainage area to the point of interest within
a watershed.
The insoluble solid matter suspended in water and stormwater
that is separable by laboratory filtration in accordance with the
procedure contained in the Standard Methods for the Examination of
Water and Wastewater prepared and published jointly by the American
Public Health Association, American Water Works Association and the
Water Pollution Control Federation. The term "TSS" shall have the
same meaning as "total suspended solids."
A flood hazard area, which may be influenced by stormwater
runoff from inland areas, but which is primarily caused by the Atlantic
Ocean.
The ocean and its estuaries, all springs, streams and bodies
of surface and ground water, whether natural or artificial, within
the boundaries of New Jersey or subject to its jurisdiction.
The upper surface of a zone of saturation.
A bored, drilled or driven shaft, or a dug hole, which extends
below the seasonally high water table and which has a depth which
is greater than its largest surface dimension.
Those lands which are inundated or saturated by water at
a magnitude, duration and frequency sufficient to support the growth
of hydrophytes. Wetlands include lands with poorly drained or very
poorly drained soils as designated by the National Cooperative Soils
Survey of the Soil Conservation Service of the United States Department
of Agriculture. Wetlands include coastal wetlands and inland wetlands,
including submerged lands. The New Jersey Pinelands Commission Manual
for Identifying and Delineating Pinelands Area Wetlands: A Pinelands
Supplement to the Federal Manual for Identifying and Delineating Jurisdictional
Wetlands, dated January, 1991, as amended, may be utilized in delineating
the extent of wetlands based on the definitions of wetlands and wetlands
soils contained in this section, N.J.A.C. 7:50 2.11, 6.4 and 6.5.
The term "wetland" shall have the same meaning as "wetlands."
A stormwater facility constructed through filling and/or
excavation that provides both permanent and temporary storage of stormwater
runoff. It has an outlet structure that creates a permanent pool and
detains and attenuates runoff inflows and promotes the settling of
pollutants. A stormwater retention basin can also be designed as a
multistage facility that also provides extended detention for enhanced
stormwater quality design storm treatment and runoff storage and attenuation
for stormwater quantity management. The term "stormwater retention
basin" shall have the same meaning as "wet pond."
Any person who erects, constructs, alters, repairs,
converts, maintains, or uses any building, structure or land in violation
of this article shall be subject to a fine not to exceed $2,000, imprisonment
up to 90 days, community service up to 90 days, or any combination
thereof. Each separate act or date upon which said prohibited conduct
occurs may be deemed a separate violation.
This article shall take effect immediately upon
the following:
If the provisions of any section, subsection,
paragraph, subdivision, or clause of this article shall be judged
invalid by a court of competent jurisdiction, such order of judgment
shall not affect or invalidate the remainder of any section, subsection,
paragraph, subdivision or clause of this article.
A.
Methods for calculating groundwater recharge.
(1)
The New Jersey Geological Survey Report GSR-32: A
Method for Evaluating Ground-Water Recharge Areas in New Jersey. Available
at http://www.njgeology.org/geodata/dgs99-2.htm.
(2)
The New Jersey Groundwater Recharge Spreadsheet (NJGRS).
Available in the New Jersey BMP Manual, Chapter 6, at http://www.njstormwater.org/bmp_manual2.htm.
B.
NJDEP nonstructural strategies point system. The New Jersey Stormwater Management Rules at N.J.A.C. 7:8-5.2(a), and § 164-15A of this article, require nonstructural stormwater management strategies to be incorporated into the site design of a major development. A total of nine strategies are to be used to the maximum extent practical to meet the groundwater recharge, stormwater quality and stormwater quantity requirements of the rules prior to utilizing structural stormwater management measures. The New Jersey Nonstructural Stormwater Management Strategies Point System (NSPS) provides a tool to assist planners, designers and regulators in determining that the strategies have been used to the "maximum extent practical" at a major development as required by the rules. Refer online to http://www.njstormwater.org for information on the NSPS.
C.
Soils.
(1)
USDA Soil Textural Triangle.
 | |
|---|---|
|
Source: US Department of Agriculture.
|
(2)
A-HORIZON
ARTESIAN ZONE OF SATURATION
CHROMA
CLAY
CLAY LOAM
COARSE FRAGMENT
COUNTY SOIL SURVEY REPORT
DIRECT SUPERVISION
EQUIVALENT SPHERICAL DIAMETER
EXCESSIVELY COARSE HORIZON
EXCESSIVELY COARSE SUBSTRATUM
EXTREMELY FIRM CONSISTENCE
FIRM CONSISTENCE
HARD CONSISTENCE
HUE
HYDRAULICALLY RESTRICTIVE HORIZON
HYDRAULICALLY RESTRICTIVE SUBSTRATUM
LOAMY SAND
LOWER PLASTIC LIMIT
MOTTLING
MUNSELL SYSTEM
O-HORIZON
PERCHED ZONE OF SATURATION
PIEZOMETER
PLATY STRUCTURE
REGIONAL ZONE OF SATURATION
SANDY CLAY
SANDY LOAM
SILT
SILT LOAM
SILTY CLAY
SILTY CLAY LOAM
SOIL AGGREGATE
SOIL COLOR
SOIL CONSISTENCE
SOIL HORIZON
SOIL LOG
SOIL MAPPING UNIT
SOIL PHASE
SOIL PROFILE
SOIL SERIES
SOIL STRUCTURAL CLASS
SOIL STRUCTURE
SOIL TEST PIT
SOIL TEXTURAL CLASS
SOIL TEXTURE
STATIC WATER LEVEL
SUBSTRATUM
UNSUITABLE SOIL
USDA SYSTEM OF CLASSIFICATION
VALUE
VERY FIRM CONSISTENCE
VERY HARD CONSISTENCE
ZONE OF SATURATION
Definitions. For the purposes of this appendix, the
following terms shall have the meanings herein ascribed to them.
The uppermost mineral horizon in a normal soil profile. The
upper part of the A-horizon is characterized by maximum accumulation
of finely divided, dark-colored organic residues known as humus, which
are intimately mixed with the mineral particles of the soil.
A zone of saturation which exists immediately below a hydraulically
restrictive horizon, and which has an upper surface that is at a pressure
greater than atmospheric, either seasonally or throughout the year.
The relative purity or strength of a color, a quantity which
decreases with increasing grayness. Chroma is one of the three variables
of soil color as defined in the Munsell system of classification.
A particle size category consisting of mineral particles which are smaller than 0.002 millimeters in equivalent spherical diameter. Also, a soil textural class having more than 40% clay, less than 45% sand, and less than 40% silt, as shown in Subsection C(1) (USDA Soil Textural Triangle).
A soil textural class having 27% to 40% clay and 20% to 45% sand, as shown in Subsection C(1) (USDA Soil Textural Triangle).
A rock fragment contained within the soil which is greater
than two millimeters in equivalent spherical diameter or which is
retained on a two millimeter sieve.
A report prepared by the United States Department of Agriculture,
Natural Resources Conservation Service, which includes maps showing
the distribution of soil mapping units throughout a particular county
together with narrative descriptions of the soil series shown and
other information relating to the uses and properties of the various
soil series.
Control over and direction of work carried out by others
with full knowledge of and responsibility for such work.
Of a particle, means the diameter of a sphere which has a
volume equal to the volume of the particle.
A horizon of limited thickness within the soil profile which
provides inadequate removal of pollutants from stormwater due to a
high coarse fragment content, excessively coarse texture and/or excessively
rapid permeability.
A substratum below the soil profile which extends beyond
the depth of soil profile pits and borings and which provides inadequate
removal of pollutants from stormwater due to a high coarse fragment
content, excessively coarse texture and/or excessively rapid permeability.
A type of soil material whose moist aggregated mass crushes
only under very strong pressure; cannot be crushed between the thumb
and forefinger and shall be broken apart bit by bit.
A type of soil material whose moist aggregated mass crushes
under moderate pressure between the thumb and forefinger but resistance
is distinctly noticeable.
A type of soil material whose dry aggregated mass is moderately
resistant to pressure; can be broken in the hands without difficulty
but is barely breakable between the thumb and forefinger.
The dominant spectral color, one of the three variables of
soil color defined within the Munsell system of classification.
A horizon within the soil profile which slows or prevents
the downward or lateral movement of water and which is underlain by
permeable soil horizons or substrata. Any soil horizon which has a
saturated permeability less than one inch per hour is hydraulically
restrictive.
A substratum below the soil profile which slows or prevents
the downward or lateral movement of water and which extends beyond
the depth of profile pits or borings or to a massive substratum. A
substratum which has a saturated permeability less than one inch per
hour is hydraulically restrictive.
A soil textural class, as shown in Subsection C(1) (USDA Soil Textural Triangle), that has a maximum of 85% to 90% sand with a percentage of silt plus 1 1/2 times the percentage of clay not in excess of 15; or a minimum of 70% to 85% sand with a percentage of silt plus 1 1/2 times the percentage of clay not in excess of 30.
The moisture content corresponding to the transition between
the plastic and semisolid states of soil consistency. This corresponds
to the lowest soil moisture content at which the soil can be molded
in the fingers to form a rod or wire, 1/8 inch in thickness, without
crumbling.
A color pattern observed in soil consisting of blotches or
spots of contrasting color. The term "mottle" refers to an individual
blotch or spot. The terms "color variegation," "iron depletion" and
"iron concentration" are equivalent to the term "mottling." Mottling
due to redoximorphic reactions is an indication of seasonal or periodic
and recurrent saturation.
A system of classifying soil color consisting of an alphanumeric
designation for hue, value and chroma, such as "7.5 YR 6/2," together
with a descriptive color name, such as "strong brown."
A surface horizon, occurring above the A-horizon in some
soils, which is composed primarily of undecomposed or partially decomposed
plant remains which have not been incorporated into the mineral soil.
A zone of saturation which occurs immediately above a hydraulically
restrictive horizon and which is underlain by permeable horizons or
substrata which are not permanently or seasonally saturated.
A device consisting of a length of metal or plastic pipe,
open at the bottom or perforated within a specified interval, and
used for the determination of depth to water, permeability or hydraulic
head within a specific soil horizon or substratum.
Characterized by a soil aggregate which has one axis distinctly
shorter than the other two and oriented with the short axis vertical.
A zone of saturation which extends vertically without interruption
below the depth of soil borings and profile pits.
A soil textural class having 35% or more of clay and 45% or more of sand, as shown in Subsection C(1) (USDA Soil Textural Triangle).
A soil textural class, as shown in Subsection C(1) (USDA Soil Textural Triangle), that has a maximum of 20% clay, and the percentage of silt plus twice the percentage of clay exceeds 30, and contains 52% or more sand; or less than 7% clay, less than 50% silt, and between 43% and 52% sand.
A particle size category consisting of mineral particles which are between 0.002 and 0.05 millimeters in equivalent spherical diameter. It also means a soil textural class having 80% or more of silt and 12% or less of clay, as shown in Subsection C(1) (USDA Soil Textural Triangle).
A soil textural class having 50 percent or more of silt and 12% to 27% of clay; or 50% to 80% of silt and less than 12% of clay, as shown in Subsection C(1) (USDA Soil Textural Triangle).
A soil textural class having 40% or more of clay and 40% or more of silt, as shown in Subsection C(1) (USDA Soil Textural Triangle).
A soil textural class having 27% to 40% of clay and less than 20% of sand, as shown in Subsection C(1) (USDA Soil Textural Triangle).
A naturally occurring unit of soil structure consisting of
particles of sand, silt, clay, organic matter, and coarse fragments
held together by the natural cohesion of the soil.
The soil color name and Munsell color designation determined
by comparison of the moist soil with color chips contained in a Munsell
soil color book.
The resistance of a soil aggregate or clod to being crushed
between the fingers or broken by the hands. Terms for describing soil
consistence described are in N.J.A.C. 7:9A-5.3(h).
A layer within a soil profile differing from layers of soil
above and below it in one or more of the soil morphological characteristics,
including color, texture, coarse fragment content, structure, consistence
and mottling.
A description of the soil profile which includes the depth,
thickness, color, texture, coarse fragment content, mottling, structure
and consistence of each soil horizon or substratum.
An area outlined on a map in a county soil survey report
and marked with a letter symbol designating a soil phase, a complex
of two or more soil phases, or some other descriptive term where no
soil type has been identified.
A specific type of soil which is mapped by the Natural Resources
Conservation Service and which belongs to a soil series described
within the county soil survey report.
A vertical cross section of undisturbed soil showing the
characteristic horizontal layers or horizons of the soil which have
formed as a result of the combined effects of parent material, topography,
climate, biological activity and time.
A grouping of soil types possessing a specific range of soil
profile characteristics which are described within the county soil
survey report. Each soil series may consist of several "soil phases"
which may differ in slope, texture of the surface horizon or stoniness.
One of the shape classes of soil structure described in N.J.A.C.
7:9A-5.3(g).
The naturally occurring arrangement within a soil horizon
of sand, silt and clay particles, coarse fragments and organic matter,
which are held together in clusters or aggregates of similar shape
and size.
An excavation made for the purpose of exposing a soil profile
which is to be described.
One of the classes of soil texture defined within the USDA
system of classification. (Soil Survey Manual, Agricultural Handbook
No. 18, USDA Soil Conservation Service 1962.)
The relative proportions of sand, silt and clay in that portion
of the soil which passes through a sieve with two-millimeter openings.
The depth below the ground surface or the elevation with
respect to some reference level of the water level observed within
a soil profile pit or boring, or within a piezometer, after this level
has stabilized or become relatively constant with the passage of time.
A layer of soil or rock material present below the soil profile
and extending beyond the depth of soil borings or profile pits.
All soil other than suitable soil.
The system of classifying soil texture used by the United States Department of Agriculture which defines 12 soil textural classes based upon the weight percentages of sand, silt and clay in that portion of the soil which passes through a sieve with two-millimeter openings. The soil textural classes are shown graphically on the USDA Soil Textural Triangle, as shown in Subsection C(1).
The relative lightness or intensity of a color, one of the
three variables of soil color defined within the Munsell system of
classification.
Characterized by a moist soil which crushes under strong
pressure; barely crushable between thumb and forefinger.
Characterized by a dry soil which is resistant to pressure,
can be broken in the hands only with difficulty; not breakable between
the thumb and forefinger.
A layer within or below the soil profile which is saturated
with groundwater either seasonally or throughout the year. This includes
both regional and perched zones.
(3)
Methods for assessing soil suitability for infiltration
stormwater management BMPs. The results of a subsurface investigation
shall serve as the basis for the site selection and design of stormwater
infiltration BMPs. The subsurface investigation shall include, but
not be limited to, a series of soil test pits and soil permeability
tests conducted in accordance with the following:
(a)
All soil test pits and soil permeability results
shall be performed under the direct supervision of a professional
engineer. All soil logs and permeability test data shall be accompanied
by a certification by a professional engineer. The results and location
(horizontal and vertical) of all soil test pits and soil permeability
tests, both passing and failing, shall be reported to the Borough
of Folsom.
(b)
During all subsurface investigations and soil
test procedures, adequate safety measures shall be taken to prohibit
unauthorized access to the excavations at all times. It is the responsibility
of persons performing or witnessing subsurface investigations and
soil permeability tests to comply with all applicable federal, state
and local laws and regulations governing occupational safety.
(c)
A minimum of two soil test pits shall be excavated
within the footprint of any proposed infiltration BMP to determine
the suitability and distribution of soil types present at the site.
Placement of the test pits shall be within 20 feet of the basin perimeter,
located along the longest axis bisecting the BMP. For BMPs larger
than 10,000 square feet in area, a minimum of one additional soil
test pit shall be conducted within each additional area of 10,000
square feet. The additional test pit(s) shall be placed approximately
equidistant to other test pits, so as to provide adequate characterization
of the subsurface material. In all cases, where soil and or groundwater
properties vary significantly, additional test pits shall be excavated
in order to accurately characterize the subsurface conditions below
the proposed infiltration BMP. Soil test pits shall extend to a minimum
depth of eight feet below the lowest elevation of the basin bottom
or to a depth that is at least two times the maximum potential water
depth in the proposed infiltration BMP, whichever is greater.
(d)
A soil test pit log shall be prepared for each
soil test pit. The test pit log shall, at a minimum, provide the elevation
of the existing ground surface, the depth and thickness (in inches)
of each soil horizon or substratum, the dominant matrix or background
and mottle colors using the Munsell system of classification for hue,
value and chroma, the appropriate textural class as shown on the USDA
textural triangle, the volume percentage of coarse fragments (larger
than two millimeters in diameter), the abundance, size, and contrast
of mottles, the soil structure, soil consistence, and soil moisture
condition, using standard USDA classification terminology for each
of these soil properties. Soil test pit logs shall identify the presence
of any soil horizon, substratum or other feature that exhibits an
in-place permeability rate less than one inch per hour.
(e)
Each soil test pit log shall report the depth
to seasonally high water level, either perched or regional, and the
static water level based upon the presence of soil mottles or other
redoximorphic features, and observed seepage or saturation. Where
redoxomorphic features including soil mottles resulting from soil
saturation are present, they shall be interpreted to represent the
depth to the seasonal high water table unless soil saturation or seepage
is observed at a higher level. When the determination of the seasonally
high water table shall be made in ground previously disturbed by excavation,
direct observation of the static water table during the months of
January through April shall be the only method permitted.
(f)
Any soil horizon or substratum which exists
immediately below a perched zone of saturation shall be deemed by
rule to exhibit unacceptable permeability (less than one inch per
hour). The perched zone of saturation may be observed directly, inferred
based upon soil morphology, or confirmed by performance of a hydraulic
head test as defined at N.J.A.C. 7:9A-5.9.
(g)
Stormwater infiltration BMPs shall not be installed
in soils that exhibit artesian groundwater conditions. A permeability
test shall be conducted in all soils that immediately underlie a perched
zone of saturation. Any zone of saturation which is present below
a soil horizon which exhibits an in-place permeability of less than
0.2 inches per hour shall be considered an artesian zone of saturation
unless a minimum one-foot-thick zone of unsaturated soil, free of
mottling or other redoximorphic features and possessing a chroma of
four or higher, exists immediately below the unsuitable soil.
(h)
A minimum of one permeability test shall be
performed at each soil test pit location. The soil permeability rate
shall be determined using test methodology as prescribed in N.J.A.C.
7:9A-6.2 (tube permeameter test), 6.5 (pit bailing test) or 6.6 (piezometer
test). When the tube permeameter test is used, a minimum of two replicate
samples shall be taken and tested. Alternative permeability test procedures
may be accepted by the approving authority, provided the test procedure
attains saturation of surrounding soils, accounts for hydraulic head
effects on infiltration rates, provides a permeability rate with units
expressed in inches per hour and is accompanied by a published source
reference. Examples of suitable sources include hydrogeology, geotechnical
or engineering text and design manuals, proceedings of American Society
for Testing and Materials (ASTM) symposia, or peer-review journals.
Neither a soil permeability class rating test, as described in N.J.A.C.
7:9A-6.3, nor a percolation test, as described in N.J.A.C. 7:9A-6.4,
are acceptable tests for establishing permeability values for the
purpose of complying with this article.
(i)
Soil permeability tests shall be conducted on
the most hydraulically restrictive horizon or substratum to be left
in place below the basin as follows: Where no soil replacement is
proposed, the permeability tests shall be conducted on the most hydraulically
restrictive horizon or substratum within four feet of the lowest elevation
of the basin bottom or to a depth equal to two times the maximum potential
water depth within the basin, whichever is greater. Where soil replacement
is proposed, the permeability tests shall be conducted within the
soil immediately below the depth of proposed soil replacement or within
the most hydraulically restrictive horizon or substratum to a depth
equal to two times the maximum potential water depth within the basin,
whichever is greater. Permeability tests may be performed on the most
hydraulically restrictive soil horizons or substrata at depths greater
than those identified above, based upon the discretion of the design
or testing engineer. The tested infiltration rate should then be divided
by two to establish the soil's design permeability rate. Such division
will provide a one-hundred-percent safety factor to the tested rate.
(j)
The minimum acceptable tested permeability rate
of any soil horizon or substratum shall be one inch per hour. Soil
materials that exhibit tested permeability rates slower than one inch
per hour shall be considered unsuitable for stormwater infiltration.
The maximum reportable tested permeability rate of any soil horizon
or substratum shall be no greater than 20 inches per hour regardless
of the rate attained in the test procedure.
(k)
After all construction activities have been
completed on the development site and the finished grade has been
established in the infiltration BMP, a minimum of one permeability
test shall be conducted within the most hydraulically restrictive
soil horizon or substratum below the as-built BMP to ensure the performance
of the infiltration BMP is as designed. Hand tools and manual permeability
test procedures shall be used for the purpose of confirming BMP performance.
In addition, the infiltration BMP shall be flooded with water sufficient
to demonstrate the performance of the BMP. Test results shall be certified
to the Municipal Engineer.
(l)
A groundwater mounding analysis shall be provided
for each stormwater infiltration BMP. The groundwater mounding analysis
shall calculate the maximum height of the groundwater mound based
upon the volume of the maximum design storm. The professional engineer
conducting the analysis shall provide the Municipal Engineer with
the methodology and supporting documentation for the mounding analysis
used and shall certify to the Borough of Folsom, based upon the analysis,
that the groundwater mound will not cause stormwater or groundwater
to break out to the land surface or cause adverse impact to adjacent
surface water bodies, wetlands or subsurface structures, including
but not limited to basements and septic systems. If there is more
than one infiltration BMP proposed, the model shall indicate if and
how the mounds will interact. The mounding analysis shall be calculated
using the most restrictive soil horizon that will remain in place
within the explored aquifer thickness unless alternative analyses
is authorized by the Municipal Engineer. The mounding analysis shall
be accompanied by a cross section of the infiltration BMP and surrounding
topography and the mound analysis shall extend out to the point(s)
at which the mound intersects with the preexisting maximum water table
elevation.
(m)
The applicant shall demonstrate that stormwater infiltration BMPs meet the seventy-two-hour drain time requirement established in § 164-16B(1) of this article.
D.
Pretreatment measures for infiltration BMPs. By reducing
incoming velocities and capturing coarser sediments, pretreatment
can extend the functional life and increase the pollutant removal
capability of infiltration measures. Therefore, the installation of
pretreatment measures is recommended for all development sites. Pretreatment
measures may include, but are not limited to, the following:
E.
Collection and conveyance.
(1)
Bicycle-safe inlet grates. Site development plans
that incorporate site design features that help 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.
(a)
Design engineers shall use either 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 (April 1996); or
[2]
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 1/2 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 basin
floors.
(b)
Whenever design engineers use a curb-opening
inlet, 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.
(c)
This standard does not apply:
[1]
Where the review agency determines that this
standard would cause inadequate hydraulic performance that could not
practicably be overcome by using additional or larger storm drain
inlets that meet these standards;
[2]
Where flows from the water quality design storm as specified in § 164-14 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:
[3]
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 § 164-14 of this article; or
[4]
Where the NJDEP determines, pursuant to the
New Jersey Register of Historic Places Rules at N.J.A.C. 7:4-7.2(c),
that action to meet this standard is an undertaking that constitutes
an encroachment or will damage or destroy the New Jersey Register-listed
historic property.
(2)
Catch basins. Catch basins are storm drain inlets
with or without sumps. Catch basins may provide pretreatment for other
stormwater BMPs by capturing large sediments. The sediment and pollutant
removal efficiency of catch basins depends on the size of the sump
and the performance of routine maintenance to retain the available
sediment storage space in the sump. Where catch basins with sumps
are proposed, the minimum two-foot separation between the bottom of
the sump and seasonally high water table shall be provided.
(3)
Open or perforated conveyance piping. Where adequate
separation to the seasonal high water table exists, stormwater from
the development site may be conveyed to a stormwater basin via a system
of perforated pipes. These pipes may be made of PVC or corrugated
metal and are available with perforations of varying size and spacing.
Perforated pipe specifications shall be certified by a professional
engineer. A professional engineer shall certify that perforated conveyance
piping will not act to intercept the seasonal high water table and
convey groundwater to the stormwater basin. All open or perforated
stormwater conveyance systems shall be installed with a minimum separation
of two feet from the seasonal high water table.
A.
NJDEP technical guidance sources.
(1)
New Jersey BMP Manual. Available from the Division
of Watershed Management, New Jersey Department of Environmental Protection,
PO Box 418, Trenton, New Jersey 08625; or online at http://www.njstormwater.org.
(2)
NJDEP Stormwater Management Facilities Maintenance
Manual. Available from the Division of Watershed Management, New Jersey
Department of Environmental Protection, PO Box 418, Trenton, New Jersey
08625; or online at http://njedl.rutgers.edu/ftp/PDFs/1188.pdf.
B.
Additional guidance sources.
(1)
New Jersey Pinelands Commission, PO Box 7, 15 Springfield
Road, New Lisbon, New Jersey 08064; Phone: 609-894-7300; Web site:
http://www.state.nj.us/pinelands.
(2)
State Soil Conservation Committee Standards for Soil
Erosion and Sediment Control in New Jersey. Available from all state
soil conservation districts, including Burlington County Soil Conservation
District, Tiffany Square, Suite 100, 1289 Route 38, Hainesport, New
Jersey 08036; Phone: 609-267-7410; Fax: 609-267-3347; Web site: http://bscd.org.
(4)
New Jersey Department of Transportation, PO Box 600,
Trenton, New Jersey 08625-0600; Phone: 609-530-3536; Web site: http://www.state.nj.us/transportation.
