(2) 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 § 188-218, or found on the Department's website at www.njstormwater.org. The BMP Manual and other sources of technical guidance are listed in § 188-218. 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, P.O. Box 418, Trenton, New Jersey 08625-0418.
(3) If more than one 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 - (AXB)/100
Where:
R.= total TSS percent load removal from application of both BMPs
A.= the TSS percent removal rate applicable to the first BMP
B.= the TSS percent removal rate applicable to the second BMP
[Amended 6-30-2009 by Ord. No. 0-09-27]
(4) 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 converges on site, in which case the removal rate can be demonstrated through a calculation using a weighted average.
(5) 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 Subsections F and G.
(6) Additional information and examples are contained in the New Jersey Stormwater Best Management Practices Manual, which may be obtained from the address identified in § 188-218.
(7) In accordance with the definition of "FW1" at N.J.A.C. 7:9B-1.4, stormwater management measures shall be designed to prevent any increase in stormwater runoff to waters classified as FW1.
(8) Special water resource protection areas shall be established along all waters designated Category One at N.J.A.C. 7:9B, and perennial or intermittent streams that drain into or upstream of the Category One waters as shown on the USGS Quadrangle Maps or in the County Soil Surveys, within the associated HUC14 drainage area. These areas shall be established for the protection of water quality, aesthetic value, exceptional ecological significance, exceptional recreational significance, exceptional water supply significance, and exceptional fisheries significance of those established Category One waters. These areas shall be designated and protected as follows:
(a) The applicant shall preserve and maintain a special water resource protection area in accordance with one of the following:
[1] A three-hundred-foot special water resource protection area shall be provided on each side of the waterway, measured perpendicular to the waterway from the top of the bank outwards or from the center line of the waterway where the bank is not defined, consisting of existing vegetation or vegetation allowed to follow natural succession.
[2] Encroachment within the designated special water resource protection area under Subsection G(8)(a)[1] above shall only be allowed where previous development or disturbance has occurred (for example, active agricultural use, parking area or maintained lawn area). The encroachment shall only be allowed where the applicant demonstrates that the functional value and overall condition of the special water resource protection area will be maintained to the maximum extent practicable. In no case shall the remaining special water resource protection area be reduced to less than 150 feet as measured perpendicular to the top-of-bank of the waterway or center line of the waterway where the bank is undefined. All encroachments proposed under this subsection shall be subject to review and approval by the Department.
(b) All stormwater shall be discharged outside of and flow through the special water resource protection area and shall comply with the standard for off-site stability in the "Standards for Soil Erosion and Sediment Control in New Jersey," established under the Soil Erosion and Sediment Control Act, N.J.S.A. 4:24-39 et seq.
(c) If stormwater discharged outside of and flowing through the special water resource protection area cannot comply with the standard for off-site stability in the "Standards for Soil Erosion and Sediment Control in New Jersey," established under the Soil Erosion and Sediment Control Act, N.J.S.A. 4:24-39 et seq., then the stabilization measures in accordance with the requirements of the above standards may be placed within the special water resource protection area, provided that:
[1] Stabilization measures shall not be placed within 150 feet of the Category One waterway;
[2] Stormwater associated with discharges allowed by this section shall achieve a ninety-five-percent TSS postconstruction removal rate;
[3] Temperature shall be addressed to ensure no impact on the receiving waterway;
[4] The encroachment shall only be allowed where the applicant demonstrates that the functional value and overall condition of the special water resource protection area will be maintained to the maximum extent practicable;
[5] A conceptual project design meeting shall be held with the appropriate Department staff and Soil Conservation District staff to identify necessary stabilization measures; and
[6] All encroachments proposed under this section shall be subject to review and approval by the Department.
(d) A stream corridor protection plan may be developed by a regional stormwater management planning committee as an element of a regional stormwater management plan, or by a municipality through an adopted municipal stormwater management plan. If a stream corridor protection plan for a waterway subject to Subsection G(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 Subsection G(8) shall maintain or enhance the current functional value and overall condition of the special water resource protection area as defined in Subsection G(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.
(e) Subsection G(8) does not apply to the construction of one individual single-family dwelling that is not part of a larger development on a lot receiving preliminary or final subdivision approval on or before February 2, 2004, provided that the construction begins on or before February 2, 2009.
A. Stormwater runoff shall be calculated in accordance with the following:
(1) The design engineer shall calculate runoff using one of the following methods:
(a) The USDA Natural Resources Conservation Service (NRCS) methodology, including the NRCS Runoff Equation and Dimensionless Unit Hydrograph, as described in the NRCS National Engineering Handbook Section 4 - Hydrology and Technical Release 55 - Urban Hydrology for Small Watersheds; or
(b) The Rational Method for peak flow and the Modified Rational Method for hydrograph computations.
(2) For the purpose of calculating runoff coefficients and groundwater recharge, there is a presumption that the preconstruction condition of a site or portion thereof is a wooded land use with good hydrologic condition. The term "runoff coefficient" applies to both the NRCS methodology at Subsection A(1)(a) and the Rational and Modified Rational Methods at Subsection A(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 has existed on the site during the five years immediately prior to the time of application, the land cover with the lowest runoff potential shall be used for the computations. In addition, there is the presumption that the site is in good hydrologic condition (if the land use type is pasture, lawn, or park), with good cover (if the land use type is woods), or with good hydrologic condition and conservation treatment (if the land use type is cultivation).
(3) In computing preconstruction stormwater runoff, the design engineer shall account for all significant land features and structures, such as ponds, wetlands, depressions, hedgerows, or culverts, that may reduce preconstruction stormwater runoff rates and volumes.
(4) In computing stormwater runoff from all design storms, the design engineer shall consider the relative stormwater runoff rates and/or volumes of pervious and impervious surfaces separately to accurately compute the rates and volume of stormwater runoff from the site. To calculate runoff from unconnected impervious cover, urban impervious area modifications as described in the NRCS Technical Release 55 - Urban Hydrology for Small Watersheds and other methods may be employed.
(5) If the invert of the outlet structure of a stormwater management measure is below the flood hazard design flood elevation as defined at N.J.A.C. 7:13, the design engineer shall take into account the effects of tailwater in the design of structural stormwater management measures.
B. Groundwater recharge may be calculated in accordance with the following: The New Jersey Geological Survey Report GSR-32, A Method for Evaluating Ground-Water Recharge Areas in New Jersey, incorporated herein by reference as amended and supplemented. Information regarding the methodology is available from the New Jersey Stormwater Best Management Practices Manual; at http://www.state.nj.us/dep/njgs/; or at New Jersey Geological Survey, 29 Arctic Parkway, P.O. Box 427, Trenton, New Jersey 08625-0427; (609) 984-6587.
A. Standards for structural stormwater management measures are as follows:
(1) Structural stormwater management measures shall be designed to take into account the existing site conditions, including, for example, environmentally critical areas; wetlands; flood-prone areas; slopes; depth to seasonal high water table; soil type, permeability and texture; drainage area and drainage patterns; and the presence of solution-prone carbonate rocks (limestone).
(2) 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 § 188-219B.
(3) Structural stormwater management measures shall be designed, constructed, and installed to be strong, durable, and corrosion resistant. Measures that are consistent with the relevant portions of the Residential Site Improvement Standards at N.J.A.C. 5:21-7.3, 5:21-7.4, and 5:21-7.5 shall be deemed to meet this requirement.
(4) At the intake to the outlet from the stormwater management basin, the orifice size shall be a minimum of 2 1/2 inches in diameter.
(5) Stormwater management basins shall be designed to meet the minimum safety standards for stormwater management basins at § 188-219.
B. 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 § 188-215 of this article.
C. Manufactured treatment devices may be used to meet the requirements of § 188-215 of this article, provided the pollutant removal rates are verified by the New Jersey Corporation for Advanced Technology and certified by the Department.
A. 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.
(1) Guidelines for stormwater management measures are contained in the New Jersey Stormwater Best Management Practices Manual, as amended. Information is provided on stormwater management measures such as bioretention systems, constructed stormwater wetlands, dry wells, extended detention basins, infiltration structures, manufactured treatment devices, pervious paving, sand filters, vegetative filter strips, and wet ponds.
(2) The New Jersey Department of Environmental Protection Stormwater Management Facilities Maintenance Manual, as amended.
B. Additional technical guidance for stormwater management measures can be obtained from the following:
(1) The Standards for Soil Erosion and Sediment Control in New Jersey promulgated by the State Soil Conservation Committee and incorporated into N.J.A.C. 2:90. Copies of these standards may be obtained by contacting the State Soil Conservation Committee or any of the Soil Conservation Districts listed in N.J.A.C. 2:90-1.3(a)4. The location, address, and telephone number of each Soil Conservation District may be obtained from the State Soil Conservation Committee, P.O. Box 330, Trenton, New Jersey 08625; (609) 292-5540;
(2) The Rutgers Cooperative Extension Service, 732-932-9306; and
(3) The Soil Conservation Districts listed in N.J.A.C. 2:90-1.3(a)4. The location, address, and telephone number of each Soil Conservation District may be obtained from the State Soil Conservation Committee, P.O. Box 330, Trenton, New Jersey 08625; (609) 292-5540.
A. This section sets forth requirements to protect public safety through the proper design and operation of stormwater management basins. This section applies to any new stormwater management basin.
B. Requirements for trash racks, overflow grates and escape provisions.
(1) A trash rack is a device designed to catch trash and debris and prevent the clogging of outlet structures. Trash racks shall be installed at the intake to the outlet from the stormwater management basin to ensure proper functioning of the basin outlets in accordance with the following:
(a) The trash rack shall have parallel bars, with no greater than six-inch spacing between the bars.
(b) The trash rack shall be designed so as not to adversely affect the hydraulic performance of the outlet pipe or structure.
(c) The average velocity of flow through a clean trash rack is not to exceed 2.5 feet per second under the full range of stage and discharge. Velocity is to be computed on the basis of the net area of opening through the rack.
(d) The trash rack shall be constructed and installed to be rigid, durable, and corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 pounds per square foot.
(2) An overflow grate is designed to prevent obstruction of the overflow structure. If an outlet structure has an overflow grate, such grate shall meet the following requirements:
(a) The overflow grate shall be secured to the outlet structure but removable for emergencies and maintenance.
(b) The overflow grate spacing shall be no less than two inches across the smallest dimension.
(c) The overflow grate shall be constructed and installed to be rigid, durable, and corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 pounds per square foot.
(3) For purposes of this Subsection B(3), "escape provisions" means the permanent installation of ladders, steps, rungs, or other features that provide easily accessible means of egress from stormwater management basins. Stormwater management basins shall include escape provisions as follows:
(a) If a stormwater management basin has an outlet structure, escape provisions shall be incorporated in or on the structure. With the prior approval of the reviewing agency identified in Subsection C, a freestanding outlet structure may be exempted from this requirement.
(b) Safety ledges shall be constructed on the slopes of all new stormwater management basins having a permanent pool of water deeper than 2 1/2 feet. Such safety ledges shall be comprised of two steps. Each step shall be four feet to six feet in width. One step shall be located approximately 2 1/2 feet below the permanent water surface, and the second step shall be located one foot to 1 1/2 feet above the permanent water surface. See Subsection D for an illustration of safety ledges in a stormwater management basin.
(c) In new stormwater management basins, the maximum interior slope for an earthen dam, embankment, or berm shall not be steeper than three horizontal to one vertical.
C. Variance or exemption from safety standards. A variance or exemption from the safety standards for stormwater management basins may be granted only upon a written finding by the appropriate reviewing agency (municipality, county or Department) that the variance or exemption will not constitute a threat to public safety.
D. Illustration of safety ledges in a new stormwater management basin.
A. Submission of site development stormwater plan.
(1) Whenever an applicant seeks municipal approval of a development subject to this article, the applicant shall submit all of the required components of the Checklist for the Site Development Stormwater Plan at Subsection C below as part of the submission of the applicant's application for subdivision or site plan approval.
(2) The applicant shall demonstrate that the project meets the standards set forth in this article.
(3) The applicant shall submit 15 copies of the materials listed in the checklist for site development stormwater plans in accordance with Subsection C of this article.
(4) No application for development shall be deemed complete unless the stormwater plan and all checklist items noted in Subsection C have been submitted to the Planning Board or Zoning Board Engineer, as the case may be, of a type and form which, when eventually reviewed by the said Engineer, would provide a sufficient basis to determine whether or not the proposed development will conform to the Township Stormwater Management Control Standards. In order to be deemed complete, the information need not be reviewed by the said Engineer for accuracy. However, if a determination is subsequently made that additional information is required, the applicant shall provide such information prior to the review agency's determination as to whether the application shall be granted or denied.
B. Site development stormwater plan approval. The applicant's site development project shall be reviewed as a part of the subdivision or site plan review process by the municipal board or official from which municipal approval is sought. That municipal board or official shall consult the engineer retained by the Planning and/or Zoning Board (as appropriate) to determine if all of the checklist requirements have been satisfied and to determine if the project meets the standards set forth in this article.
C. Checklist requirements. The following information shall be required:
(1) Topographic base map. The reviewing engineer may require upstream tributary drainage system information as necessary. It is recommended that the topographic base map of the site be submitted which extends a minimum of 200 feet beyond the limits of the proposed development, at a scale of one inch equals 200 feet or greater, showing two-foot contour intervals. The map, as appropriate, may indicate the following: existing surface water drainage, shorelines, steep slopes, soils, erodible soils, perennial or intermittent streams that drain into or upstream of the Category One waters, wetlands and floodplains along with their appropriate buffer strips, marshlands and other wetlands, pervious or vegetative surfaces, existing man-made structures, roads, bearing and distances of property lines, and significant natural and man-made features not otherwise shown.
(2) Environmental site analysis: a written and graphic description of the natural and man-made features of the site and its environs. This description should include a discussion of soil conditions, slopes, wetlands, waterways and vegetation on the site. Particular attention should be given to unique, unusual, or environmentally sensitive features and to those that provide particular opportunities or constraints for development.
(3) Project description and site plan(s): a map (or maps) at the scale of the topographical base map indicating the location of existing and proposed buildings, roads, parking areas, utilities, structural facilities for stormwater management and sediment control, and other permanent structures. The map(s) shall also clearly show areas where alterations occur in the natural terrain and cover, including lawns and other landscaping, and seasonal high groundwater elevations. A written description of the site plan and justification of proposed changes in natural conditions may also be provided.
(4) Land use planning and source control plan. This plan shall provide a demonstration of how the goals and standards of Subsection C(3) through (6) are being met. The focus of this plan shall be to describe how the site is being developed to meet the objective of controlling groundwater recharge, stormwater quality and stormwater quantity problems at the source by land management and source controls whenever possible.
(5) Stormwater management facilities map. The following information, illustrated on a map of the same scale as the topographic base map, shall be included:
(a) Total area to be paved or built upon, proposed surface contours, land area to be occupied by the stormwater management facilities and the type of vegetation thereon, and details of the proposed plan to control and dispose of stormwater.
(b) Details of all stormwater management facility designs, during and after construction, including discharge provisions, discharge capacity for each outlet at different levels of detention and emergency spillway provisions with maximum discharge capacity of each spillway.
(6) Calculations.
(a) Comprehensive hydrologic and hydraulic design calculations for the predevelopment and postdevelopment conditions for the design storms specified in § 188-215 of this article.
(b) When the proposed stormwater management control measures (e.g., infiltration basins) depend on the hydrologic properties of soils, then a soils report shall be submitted. The soils report shall be based on on-site boring logs or soil pit profiles. The number and location of required soil borings or soil pits shall be determined based on what is needed to determine the suitability and distribution of soils present at the location of the control measure. A minimum of two on-site boring logs or soil pit profiles are required and additional if and where required as directed by the Board Engineer.
(7) Maintenance and repair plan. The design and planning of the stormwater management facility shall meet the maintenance requirements of § 188-221.
(8) Waiver from submission requirements. The municipal official or board reviewing an application under this article may, in consultation with the Municipal Engineer, waive submission of any of the requirements in Subsection C(1) through (6) of this article when it can be demonstrated that the information requested is impossible to obtain or it would create a hardship on the applicant to obtain and its absence will not materially affect the review process.
A. Applicability:
(1) Projects subject to review as in § 188-212C of this article shall comply with the requirements of Sections B and C.
(2) Any entity seeking to dedicate any stormwater management facility to the Township for ownership and/or operation and/or maintenance.
B. General maintenance.
(1) The design engineer shall prepare a maintenance plan for the stormwater management measures incorporated into the design of a major development.
(2) The maintenance plan shall contain specific preventative maintenance tasks and schedules; cost estimates, including estimated cost of sediment, debris, or trash removal; and all associated maintenance items for said stormwater management facility; and the name, address, and telephone number of the person or persons responsible for preventative and corrective maintenance (including replacement). Maintenance guidelines for stormwater management measures are available in the New Jersey Stormwater Best Management Practices Manual. If the maintenance plan identifies a person other than the developer (for example, a public agency or homeowners' association) as having the responsibility for maintenance, the plan shall include documentation of such person's agreement to assume this responsibility, or of the developer's obligation to dedicate a stormwater management facility to such person under an applicable ordinance or regulation.
(3) Responsibility for maintenance shall not be assigned or transferred to the owner or tenant of an individual property in a residential development or project, unless such owner or tenant owns or leases the entire residential development or project.
(4) If the person responsible for maintenance identified under Subsection B(2) above is not a public agency, the maintenance plan and any future revisions based on Subsection B(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.
(5) Preventative and corrective maintenance shall be performed to maintain the function of the stormwater management measure, including repairs or replacement to the structure; removal of sediment, debris, or trash; restoration of eroded areas; snow and ice removal; fence repair or replacement; restoration of vegetation; and repair or replacement of nonvegetated linings.
(6) The person responsible for maintenance identified under Subsection B(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.
(7) The person responsible for maintenance identified under Subsection B(2) above shall evaluate the effectiveness of the maintenance plan at least once per year and adjust the plan and the deed as needed.
(8) The person responsible for maintenance 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 maintenance plan and the documentation required by Subsection B(6) and (7) above.
(9) The requirements of Subsection B(3) and (4) do not apply to stormwater management facilities that are dedicated to and accepted by the municipality or another governmental agency.
(10) In the event that the stormwater management facility becomes a danger to public safety or public health, or if it is in need of maintenance or repair, the municipality shall so notify the responsible person in writing. Upon receipt of that notice, the responsible person shall have 14 days to effect maintenance and repair of the facility in a manner that is approved by the municipal engineer or his designee. The municipality, in its discretion, may extend the time allowed for effecting maintenance and repair for good cause. If the responsible person fails or refuses to perform such maintenance and repair, the municipality or county may immediately proceed to do so and shall bill the cost thereof to the responsible person.
(11) Stormwater management facilities required for development of commercial or industrial development. The stormwater management facility shall be a part of an individual lot owned and maintained by the property owner. No responsibility or otherwise shall be inured to the Township.
(12) Stormwater management facilities required for rental multifamily development. The stormwater management facility shall be a part of the development. No maintenance responsibilities or otherwise should inure to the Township.
(13) Stormwater management facilities required for development of for sale, multifamily development. The stormwater management facility shall be a part of a common open space owned by the owners' association. No maintenance responsibility or otherwise should inure to the Township.
(14) The Township shall not accept responsibility for the maintenance of any subsurface stormwater management facilities required for development. No responsibility or otherwise shall be inured to the Township for any and all subsurface stormwater management facilities or other facilities not agreed upon by the Township.
(15) Stormwater management facilities required for single-family detached development.
(a) Stormwater management basins may be placed in land dedicated to the Township or contained within a lot to be designated as a drainage easement that will either be retained as private ownership or deeded to a homeowners' association. No portion of the stormwater management basin shall be included in any required lot area. On large cluster projects, an area of no less than five acres shall be required, and the detention basin shall be designed as a multipurpose stormwater control recreational facility, hereby known as a "multipurpose facility."
(b) For the purposes of this subsection, "large projects" are defined as the combined area of open space and stormwater management basins that are greater than five acres. In these cases they shall be developed as multipurpose facilities.
(c) All other projects shall be considered small projects and may have the stormwater management basin on smaller lots. Where multiple stormwater management basins or facilities are proposed within a project and the project is defined as a large project, then at least one stormwater management basin must be designed as a multipurpose facility. Any remaining stormwater basins or facilities may follow the guidelines of smaller projects.
(d) All retention basins shall be designed at a minimum depth of five feet with side slopes at a minimum of 5:1 for the first 15 horizontally and then at a minimum of 3:1.
(e) All detention basins shall be designed with side slopes at a minimum of 5:1 and have a maximum depth of three feet measured from the orifice invert elevation to the one-hundred-year water surface elevation.
(f) On smaller projects where the stormwater management basin is not part of the open space, the stormwater management basin shall be contained on a separate lot a minimum of 125% of the area required to store the one-hundred-year storm. The separate lot need not conform to zoning requirements but must have a minimum of 25 feet of frontage.
(g) Further, the Township shall require as part of the developer's agreement a maintenance agreement for all stormwater management facilities. The maintenance agreement shall be in full force and effect upon release of the performance guarantees.
(16) At the time of approval of the plan, responsibility for continued maintenance of stormwater management facilities and measures shall be stipulated and recorded in the resolution of approval.
(17) Where continued maintenance is to be the responsibility of the applicant, a proposed maintenance agreement, along with an approved maintenance plan identified under Subsection B(2) above, shall be submitted. The agreement shall specify the maintenance responsibility and standards during and after completion of the proposed activity and, upon approval, shall be recorded by the applicant in the office of the County Clerk. The applicant shall thereafter file a copy of the recorded agreement with the Township. The Township shall retain the right to enter and make repairs and improvements where necessary in accordance with Subsection B(10) above.
(18) Where continued maintenance of a stormwater management facility is to be the responsibility of the Township, the following provisions may apply:
(a) The applicant shall maintain the stormwater management facility during the construction phase of the project.
(b) The applicant shall enter into a stormwater maintenance agreement with the governing body prior to the signing and recording of the final subdivision plat and as a condition of subdivision approval from the Boards. The Township shall not accept the facility until the applicant has executed and filed the stormwater maintenance agreement which shall include a statement that the stormwater maintenance fee contribution is made in consideration of the Township assuming all future maintenance of the facility. The form of agreement shall be provided by the Township. The agreement, upon execution, shall be recorded by the applicant in the office of the County Clerk. The applicant shall thereafter file a copy of the recorded agreement with the Township.
(c) The stormwater maintenance fee contribution required shall be for the purpose of reimbursing the Township for direct fees, costs, charges and expenses for the maintenance of a stormwater management facility, including but not limited to routine mowing, maintenance of landscaping, general maintenance concerning inlets, cleaning of property, inspection and long-range maintenance on a periodic basis.
(d) Prior to final approval, all applicants must submit a maintenance plan per Subsection B(2) above for any and all stormwater management measures prepared in accordance with the NJ Stormwater Best Management Practices Manual, latest edition, subject to the review and approval of the Board Engineer and Township Engineer. The amount of the applicant's contribution for stormwater maintenance fees associated with operation maintenance costs for said stormwater management facility shall be based upon the maintenance plan, which will include a detailed cost estimate. The cost estimate shall consist of and outline the cost of the stormwater management facility operations and maintenance tasks including interim and formal maintenance operations such as mowing, sediment, trash and debris removal, maintenance of the infiltration layer of recharge basins, stormwater sewer cleaning, inspection costs, etc. See Schedule XXIV-A, Stormwater Management Annual Cost Calculation Form.
[1] The minimum contribution for stormwater maintenance fees for any stormwater management facility shall be $42,550.
[2] An applicant seeking approval for construction of a stormwater management facility shall provide the funds necessary to permanently maintain the facility for a ten-year life span.
[3] The amount necessary to permanently maintain the facility shall be based upon the review of the maintenance plan and calculated in accordance with Subsection B(18)(d)[4] below by the Board Engineer and agreed upon by the Township Engineer.
[4] The following equation shall be used to calculate the stormwater maintenance fee contribution compounded annually as required to maintain a stormwater management facility: [Amended 6-30-2009 by Ord. No. 0-09-26]
Where:
F.= stormwater maintenance fee contribution
A.= estimated annual cost
i = 2% (compounded annually)
n = 10 periods (10 years)
(e) Timing of payments. Fifty percent of the stormwater maintenance fee contribution owed to the Township for residential development shall be paid at the time of the issuance of each building permit and the remaining 50% shall be paid at the time of issuance of each certificate of occupancy required in connection with the development, and shall be calculated as follows:
[1] For residential developments, the payment of the 50% required at the time of the issuance of each building permit shall be calculated using an estimated equalized valuation of each residential unit.
[2] For residential developments, the remaining payment of the 50% required at the time of the issuance of the certificate of occupancy shall be calculated using an estimated equalized valuation of each residential limit.
(f) Upon certification by the Township Engineer that the project is complete and the guarantee for the project may be released, acceptance of the stormwater management facility by the Township shall be specifically stated in the resolution authorizing the guarantee release. The stormwater maintenance fee contribution, as determined by the Board Engineer and agreed upon by the Township Engineer, as stated in Subsection B(18)(c) above shall be posted prior to the release of the guarantee. Any interim guarantee reductions authorized by the Township shall not be construed to mean that all or any part of the facility has been accepted by the Township.
(g) The stormwater maintenance fee contribution includes maintenance of the lot or open space area in which the stormwater management facility or facilities are located.
(h) A requirement of a stormwater maintenance agreement for the stormwater management facility applies to all stormwater management facilities. This stormwater maintenance agreement is for the upkeep and care of the facility and is separate and distinct from the maintenance agreement for any site improvements as set forth in N.J.S.A. 40:55D-53(a)(2).
(19) As-built certification. Prior to the acceptance by the Township of any surface stormwater management facilities, the developer's engineer shall certify that said facilities were constructed in accordance with the approved plan and maintenance plan.
C. Nothing in this section shall preclude the municipality in which the major development is located from requiring the posting of a performance or maintenance guarantee in accordance with N.J.S.A. 40:55D-53.
