Source: https://www.ecode360.com/14638357
Timestamp: 2019-04-18 23:15:00
Document Index: 643070295

Matched Legal Cases: ['§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 2011', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 237', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 437', '§ 326', '§ 437']

Borough of Hawthorne, NJ Stormwater Management
§ 437-1 Scope and purpose.
§ 437-2 Definitions.
§ 437-3 General standards.
§ 437-4 Stormwater management requirements for major development.
§ 437-5 Calculation of stormwater runoff and groundwater recharge.
§ 437-6 Standards for structural stormwater management measures.
§ 437-7 Nonstructural stormwater strategies.
§ 437-8 Sources for technical guidance.
§ 437-9 Safety standards for stormwater management basins.
§ 437-10 Requirements for site development stormwater plan.
§ 437-11 Maintenance and repair.
§ 437-12 Violations and penalties.
§ 437-13 When effective.
Chapter 437 Stormwater Management
[HISTORY: Adopted by the Municipal Council of the Borough of Hawthorne 4-5-2006 by Ord. No. 1873-06. Amendments noted where applicable.]
Fertilizer application — See Ch. 226.
Movement of soil — See Ch. 420.
Storm sewers — See Ch. 432.
Streets and sidewalks — See Ch. 444.
Tree removal — See Ch. 488.
Purpose. It is the purpose of this chapter to establish minimum stormwater management requirements and controls for major development as defined in § 437-2.
This chapter shall also be applicable to all major developments undertaken by the Borough of Hawthorne.
This chapter is not intended to interfere with, abrogate, or annul any other ordinances, rule or regulation, statute, or other provision of law except that, where any provision of this chapter imposes restrictions different from those imposed by any other ordinance, rule or regulation, or other provision of law, the more restrictive provisions or higher standards shall control.
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 county planning agency; or a county water resource association created under N.J.S.A 58:16A-55.5, if the ordinance or resolution delegates authority to approve, conditionally approve, or disapprove municipal stormwater management plans and implementing ordinances.
The division of a parcel of land into two or more parcels, the construction, reconstruction, conversion, structural alteration, relocation or enlargement of any building or structure, any mining excavation or landfill, and any use or change in the use of any building or other structure, or land or extension of use of land, by any person, for which permission is required under the Municipal Land Use Law, N.J.S.A. 40:55D-1 et seq. In the case of development of agricultural lands, "development" means any activity that requires a state permit; any activity reviewed by the County Agricultural Board (CAB) and the State Agricultural Development Committee (SADC); and municipal review of any activity not exempted by the Right to Farm Act, N.J.S.A. 4:1C-1 et seq.
An area or feature which is of significant environmental value, including, but not limited to, stream corridors; natural heritage priority sites; habitat of endangered or threatened species; large areas of contiguous open space or upland forest; steep slopes; and well head protection and groundwater recharge areas. Habitats of endangered or threatened species are identified using the Department's Landscape Project as approved by the Department's Endangered and Nongame Species Program.
Any development that provides for ultimately disturbing one or more acres of land or increased impervious surface of 1/4 acre or more. "Disturbance" for the purpose of this chapter is the placement of impervious surface or exposure and/or movement of soil or bedrock or clearing, cutting, or removing of vegetation.
Any individual, corporation, company, partnership, firm, association, Borough of Hawthorne, 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.
Any dredged soil, solid waste, incinerator residue, filter backwash, sewage, garbage, refuse, oil, grease, sewage sludge, munitions, chemical wastes, biological materials, medical wastes, radioactive substance (except those regulated under the Atomic Energy Act of 1954, as amended (42 U.S.C. § 2011 et seq.), thermal waste, wrecked or discarded equipment, rock, sand, cellar dirt, industrial, municipal, agricultural, and construction waste or runoff, or other residue discharged directly or indirectly to the land, groundwater or surface water of the state, or to a domestic treatment works. "Pollutant" includes both hazardous and nonhazardous pollutants.
Defined as the geographic application of the State Development and Redevelopment Plan's goals and statewide policies, and the official map of these goals and policies.
Defined as previously developed portions of areas:
Stormwater management measures for major development shall be developed to meet the erosion control, groundwater recharge, stormwater runoff quantity, and stormwater runoff quality standards in § 437-4. To the maximum extent practicable, these standards shall be met by incorporating nonstructural stormwater management strategies into the design. If these strategies alone are not sufficient to meet these standards, structural stormwater management measures necessary to meet these standards shall be incorporated into the design.
The development shall incorporate a maintenance plan for the stormwater management measures incorporated into the design of a major development in accordance with § 437-10.
Stormwater management measures shall avoid adverse impacts of concentrated flow on habitat for threatened and endangered species as documented in the Department Landscape Project or Natural Heritage Database established under N.J.S.A. 13:1B-15.147 through 13:1B-15.150, particularly Helonias bullata (swamp pink) and/or Clemmys muhlenbergi (bog turtle).
The following linear development projects are exempt from the groundwater recharge, stormwater runoff quantity, and stormwater runoff quality requirements of § 437-4F and G:
A waiver from strict compliance from the groundwater recharge, stormwater runoff quantity, and stormwater runoff quality requirements of § 437-4F and G may be obtained for the enlargement of an existing public roadway or railroad or the construction or enlargement of a public pedestrian access, provided that the following conditions are met:
The applicant demonstrates through an alternative analysis, that through the use of nonstructural and structural stormwater management strategies and measures, the option selected complies with the requirements of § 437-4F and G to the maximum extent practicable;
The applicant demonstrates that, in order to meet the requirements of § 437-4F and G, existing structures currently in use, such as homes and buildings, would need to be condemned; and
The applicant demonstrates that it does not own or have other rights to areas, including the potential to obtain through condemnation lands not falling under Subsection D(3) above within the upstream drainage area of the receiving stream, that would provide additional opportunities to mitigate the requirements of § 437-4F and G that were not achievable on site.
To the maximum extent practicable, the standards in § 437-4F and G shall be met by incorporating nonstructural stormwater management strategies set forth at § 437-4E into the design. The applicant shall identify the nonstructural measures incorporated into the design of the project. If the applicant contends that it is not feasible for engineering, environmental, or safety reasons to incorporate any nonstructural stormwater management measures identified in Subsection E(2) below into the design of a particular project, the applicant shall identify the strategy considered and provide a basis for the contention.
Where flows from the water quality design storm as specified in § 437-4G(1) 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:
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 § 437-4G(1); or
Any land area used as a nonstructural stormwater management measure to meet the performance standards in § 437-4F and G shall meet one of the following requirements:
Be dedicated to a government agency as approved by the appropriate reviewing agency, or
Guidance for nonstructural stormwater management strategies is available in the New Jersey Stormwater Best Management Practices Manual. The BMP Manual may be obtained from the address identified in § 437-8 or found on the Department's website at www.njstormwater.org.
The design engineer shall, using the assumptions and factors for stormwater runoff and groundwater recharge calculations at § 437-5 either:
Stormwater from areas of high pollutant loading. High pollutant loading areas are areas in industrial and commercial developments where solvents and/or petroleum products are loaded/unloaded, stored, or applied; areas where pesticides are loaded/unloaded or stored; areas where hazardous materials are expected to be present in greater than reportable quantities as defined by the United States Environmental Protection Agency (EPA) at 40 CFR 302.4; areas where recharge would be inconsistent with Department approved remedial action work plan or landfill closure plan and areas with high risks for spills of toxic materials, such as gas stations and vehicle maintenance facilities; and
Industrial stormwater exposed to source material. "Source material" means any material(s) or machinery, located at an industrial facility, that is directly or indirectly related to process, manufacturing or other industrial activities, which could be a source of pollutants in any industrial stormwater discharge to groundwater. Source materials include, but are not limited to, raw materials, intermediate products, final products, waste materials, by-products, industrial machinery and fuels, and lubricants, solvents, and detergents that are related to process, manufacturing, or other industrial activities that are exposed to stormwater.
The design engineer shall assess the hydraulic impact on the groundwater table and design the site so as to avoid adverse hydraulic impacts. Potential adverse hydraulic impacts include, but are not limited to, exacerbating a naturally or seasonally high water table so as to cause surficial ponding, flooding of basements, or interference with the proper operation of subsurface sewage disposal systems and other subsurface structures in the vicinity or down gradient of the groundwater recharge area.
In order to control stormwater runoff quantity impacts, the design engineer shall, using the assumptions and factors for stormwater runoff calculations at § 437-5, complete one of the following:
Any application for a new agricultural development that meets the definition of major development at § 437-2 shall be submitted to the appropriate Soil Conservation District for review and approval in accordance with the requirements of this section and any applicable Soil Conservation District guidelines for stormwater runoff quantity and erosion control. For the purposes of this section, "agricultural development" means land uses normally associated with the production of food, fiber and livestock for sale. Such uses do not include the development of land for the processing or sale of food and the manufacturing of agriculturally related products.
For purposes of TSS reduction calculations, Table 2 below presents the presumed removal rates for certain BMPs designed in accordance with the New Jersey Stormwater Best Management Practices Manual. The BMP Manual may be obtained from the address identified in § 437-8, or found on the Department's website at www.njstormwater.org. The BMP Manual and other sources of technical guidance are listed in § 437-8. TSS reduction shall be calculated based on the removal rates for the BMPs in Table 2 below. Alternative removal rates and methods of calculating removal rates may be used if the design engineer provides documentation demonstrating the capability of these alternative rates and methods to the review agency. A copy of any approved alternative rate or method of calculating the removal rate shall be provided to the Department at the following address: Division of Watershed Management, New Jersey Department of Environmental Protection, PO Box 418 Trenton, New Jersey, 08625-0418.
See § 437-6C
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.
Stormwater management measures shall also be designed to reduce, to the maximum extent feasible, the postconstruction nutrient load of the anticipated load from the developed site in stormwater runoff generated from the water quality design storm. In achieving reduction of nutrients to the maximum extent feasible, the design of the site shall include nonstructural strategies and structural measures that optimize nutrient removal while still achieving the performance standards in § 437-4F and G.
Additional information and examples are contained in the New Jersey Stormwater Best Management Practices Manual, which may be obtained from the address identified in § 437-8.
A stream corridor protection plan may be developed by a regional stormwater management planning committee as an element of a regional stormwater management plan, or by a municipality through an adopted municipal stormwater management plan. If a stream corridor protection plan for a waterway subject to § 437-4G(8) has been approved by the Department of Environmental Protection, then the provisions of the plan shall be the applicable special water resource protection area requirements for that waterway. A stream corridor protection plan for a waterway subject to § 437-4G(8) shall maintain or enhance the current functional value and overall condition of the special water resource protection area as defined in § 437-4G(8)(a)[1] above. In no case shall a stream corridor protection plan allow the reduction of the special water resource protection area to less than 150 feet as measured perpendicular to the waterway subject to this subsection.
The USDA Natural Resources Conservation Service (NRCS) methodology, including the NRCS Runoff Equation and Dimensionless Unit Hydrograph, as described in the NRCS National Engineering Handbook Section 4, Hydrology and Technical Release 55, Urban Hydrology for Small Watersheds; or
For the purpose of calculating runoff coefficients and groundwater recharge, there is a presumption that the preconstruction condition of a site or portion thereof is a wooded land use with good hydrologic condition. The term "runoff coefficient" applies to both the NRCS methodology at § 437-5A(1)(a) and the Rational and Modified Rational Methods at § 437-5A(1)(b). A runoff coefficient or a groundwater recharge land cover for an existing condition may be used on all or a portion of the site if the design engineer verifies that the hydrologic condition has existed on the site or portion of the site for at least five years without interruption prior to the time of application. If more than one land cover have existed on the site during the five years immediately prior to the time of application, the land cover with the lowest runoff potential shall be used for the computations. In addition, there is the presumption that the site is in good hydrologic condition (if the land use type is pasture, lawn, or park), with good cover (if the land use type is woods), or with good hydrologic condition and conservation treatment (if the land use type is cultivation).
In computing stormwater runoff from all design storms, the design engineer shall consider the relative stormwater runoff rates and/or volumes of pervious and impervious surfaces separately to accurately compute the rates and volume of stormwater runoff from the site. To calculate runoff from unconnected impervious cover, urban impervious area modifications as described in the NRCS Technical Release 55, Urban Hydrology for Small Watersheds, and other methods may be employed.
The New Jersey Geological Survey Report GSR-32, A Method for Evaluating Ground-Water Recharge Areas in New Jersey, incorporated herein by reference as amended and supplemented. Information regarding the methodology is available from the New Jersey Stormwater Best Management Practices Manual; at http://www.state.nj.us/dep/njgs/; or at New Jersey Geological Survey, 29 Arctic Parkway, P.O. Box 427 Trenton, New Jersey 08625-0427; (609) 984-6587.
Structural stormwater management measures shall be designed to minimize maintenance, facilitate maintenance and repairs, and ensure proper functioning. Trash racks shall be installed at the intake to the outlet structure, as appropriate, and shall have parallel bars with one-inch spacing between the bars to the elevation of the water quality design storm. For elevations higher than the water quality design storm, the parallel bars at the outlet structure shall be spaced no greater than 1/3 the width of the diameter of the orifice or 1/3 the width of the weir, with a minimum spacing between bars of one inch and a maximum spacing between bars of six inches. In addition, the design of trash racks must comply with the requirements of § 437-9B.
Stormwater management basins shall be designed to meet the minimum safety standards for stormwater management basins at § 437-9.
Stormwater management measure guidelines are available in the New Jersey Stormwater Best Management Practices Manual. Other stormwater management measures may be utilized provided the design engineer demonstrates that the proposed measure and its design will accomplish the required water quantity, groundwater recharge and water quality design and performance standards established by § 437-4 of this chapter.
Manufactured treatment devices may be used to meet the requirements of § 437-4 of this chapter, provided the pollutant removal rates are verified by the New Jersey Corporation for Advanced Technology and certified by the Department.
Driveways and accessways. The use of pervious paving materials to minimize stormwater runoff and promote groundwater recharge should be considered for driveways and access ways where practical. Consideration should be given for subsurface soil conditions. The use of crowned driveways is also encouraged to promote disconnectivity between impervious surfaces and allow grass areas to promote groundwater recharge.
Natural features. Natural features, such as trees, brooks, swamps, hilltops, and views, are to be preserved, whenever possible, and that care be taken to preserve selected trees to enhance soil stability and landscape treatment of the area. In addition, forested areas shall be maintained to ensure that leaf litter and other beneficial aspects of the forest are maintained in addition to the trees.
Nonconforming uses, structures or lots. The existing ordinance[1] may allow an applicant/owner of an existing use to propose additions or alterations that exceed the permitted building and/or lot coverage percentages. The applicant should mitigate the impact of the additional impervious surfaces unless the stormwater management plan for the development provided for these increases in impervious surfaces. This mitigation effort must address water quality, flooding and groundwater recharge.
Editor's Note: See Ch. 540, Zoning.
Off-site and off-tract improvements. Any off-site and off-tract stormwater management and drainage improvements shall conform to the design and performance standards described herein and in the Borough Code.
Off-street parking and loading. Where practical, parking lots with more than 10 spaces and all loading areas should allow for flush curb with curb stop, or curbing with curb cuts to encourage developers to allow for the discharge of impervious areas into landscaped areas for stormwater management. The use of natural vegetated swales for the water quality design storm, with overflow for larger storm events into storm sewers should be utilized where practical. A developer may demonstrate that fewer spaces would be required, provided that area is set aside for additional spaces if necessary. Pervious paving could be provided for overflow parking areas.
Shade trees. The existing ordinance[2]requires shade trees to be planted along the street on which the building fronts. In addition to this section, the Borough may have a Tree Preservation Ordinance[3] that restricts and otherwise controls the removal of mature trees throughout the Borough. This chapter should recognize that the preservation of mature trees and forested areas must be considered in the management of environmental resources, particularly watershed management, air quality, and ambient heating and cooling. A critical disturbance area that extends beyond the driveway and building footprint where clearing of trees cannot occur shall be depicted on the plan minimizing land disturbance. Identification of forested areas and the percentage of wooded areas be protected from disturbance shall also be provided.
Editor's Note: See Ch. 491, Trees, Shade,
Editor's Note: See Ch. 488, Tree Removal.
Soil erosion and sediment control. The applicant shall comply with the New Jersey Soil Erosion and Sediment Control Standards and/or Chapter 420, Soil, Movement of, as applicable and should incorporate procedures to retain and protect natural vegetation; minimize and retain water runoff to facilitate groundwater recharge; and install diversions, sediment basins, and similar required structures prior to any on-site grading or disturbance.
Technical guidance for stormwater management measures can be found in the documents listed at Subsection A(1) and (2) below, which are available from Maps and Publications, New Jersey Department of Environmental Protection, 428 East State Street, P.O. Box 420, Trenton, New Jersey, 08625; telephone (609) 777-1038.
This section sets forth requirements to protect public safety through the proper design and operation of stormwater management basins. This section applies to any new stormwater management basin. The provisions of this section do not preempt more stringent municipal or county safety requirements for new or existing stormwater management basins. Municipal and county stormwater management plans and ordinances may, pursuant to their authority, require existing stormwater management basins to be retrofitted to meet one or more of the safety standards in Subsection B(1), (2) and (3) for trash racks, overflow grates, and escape provisions at outlet structures.
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 feet square.
If a stormwater management basin has an outlet structure, escape provisions shall be incorporated in or on the structure. With the prior approval of the reviewing agency identified in § 437-9C, a freestanding outlet structure may be exempted from this requirement.
Safety ledges shall be constructed on the slopes of all new stormwater management basins having a permanent pool of water deeper than 2 1/2 feet. Such safety ledges shall be comprised of two steps. Each step shall be four feet to six feet in width. One step shall be located approximately 2 1/2 feet below the permanent water surface, and the second step shall be located one to 1 1/2 feet above the permanent water surface. See § 437-9D for an illustration of safety ledges in a stormwater management basin.
Whenever an applicant seeks municipal approval of a development subject to this chapter, the applicant shall submit all of the required components of the checklist for the site development stormwater plan at § 437-10C below as part of the submission of the applicant's application for subdivision or site plan approval.
The applicant shall submit four copies of the materials listed in the checklist for site development stormwater plans in accordance with § 437-10C of this chapter.
Land use planning and source control plan. This plan shall provide a demonstration of how the goals and standards of §§ 437-3 through 437-7 are being met. The focus of this plan shall be to describe how the site is being developed to meet the objective of controlling groundwater recharge, stormwater quality and stormwater quantity problems at the source by land management and source controls whenever possible.
Comprehensive hydrologic and hydraulic design calculations for the predevelopment and postdevelopment conditions for the design storms specified in § 437-4 of this chapter.
Maintenance and repair plan. The design and planning of the stormwater management facility shall meet the maintenance requirements of § 437-11.
Waiver from submission requirements. The municipal official or board reviewing an application under this chapter may, in consultation with the municipal engineer, waive submission of any of the requirements in § 437-10C(1) through (6) of this chapter when it can be demonstrated that the information requested is impossible to obtain or it would create a hardship on the applicant to obtain and its absence will not materially affect the review process.
Applicability. Projects subject to review as in § 237-1C of this chapter shall comply with the requirements of § 437-11B and C.
Contain specific preventative maintenance tasks and schedules; and the name, address, and telephone number of the person or persons responsible for preventative and corrective maintenance (including replacement).
Maintenance guidelines for stormwater management measures are available in the New Jersey Stormwater Best Management Practices Manual. If the maintenance plan identifies a person other than the developer (for example, a public agency or homeowners' association) as having the responsibility for maintenance, the plan shall include documentation of such person's agreement to assume this responsibility, or of the developer's obligation to dedicate a stormwater management facility to such person under an applicable ordinance or regulation.
If the person responsible for maintenance identified under § 437-11B(2) above is not a public agency, the maintenance plan and any future revisions based on § 437-11B(7) below shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan must be undertaken.
The person responsible for maintenance identified under § 437-11B(2) above shall maintain a detailed log of all preventative and corrective maintenance for the structural stormwater management measures incorporated into the design of the development, including a record of all inspections and copies of all maintenance-related work orders.
The person responsible for maintenance identified under § 437-11B(2) above shall evaluate the effectiveness of the maintenance plan at least once per year. Any adjustments to the management plan or deed shall require notification and approval from the applicable board prior to the filing of a revised deed.
The person responsible for maintenance identified under § 437-11B(2) above shall retain and make available, upon request by any public entity with administrative, health, environmental, or safety authority over the site, the maintenance plan and the documentation required by § 326-11B(6) and (7) above.
The requirements of § 437-11B(3) and (4) do not apply to stormwater management facilities that are dedicated to and accepted by the municipality or another governmental agency.
Any person who erects, constructs, alters, repairs, converts, maintains, or uses any building, structure or land in violation of this chapter shall be subject to the following penalties: a fine not to exceed $500 per day for the first offense and a fine not to exceed $2,000 per day with the possibility of imprisonment for the second and subsequent offenses.
This chapter shall take effect immediately upon the approval by the county review agency, or 60 days from the receipt of this chapter by the county review agency, if the county review agency should fail to act.