The stormwater management plan shall be prepared by a licensed professional engineer experienced in stormwater management and erosion and sedimentation control. The following items shall be included in the stormwater management plan:
A. Written report, including the following information:
(1) Narrative description of project.
(2) Narrative description of proposed stormwater management controls and facilities, both during and after development, including construction specifications.
(3) Narrative description of erosion and sedimentation controls, including those contained in any required erosion and sedimentation control plan, including construction specifications and all necessary calculations.
(4) Complete hydrologic, hydraulic and structural computations for all stormwater management facilities accompanied by a narrative description of the computations, including an explanation of all assumptions, estimations and design criteria.
(5) Expected project time schedule, including anticipated start and completion dates.
(6) Written maintenance plan for postconstruction time frame,
B. Maps, including or prepared in accordance with the following:
(1) Drafting standards. The drafting standards, including requirements for scale, dimensions, sheet numbering and plan size, shall be the same standards as those listed in the Township Code, Chapter 212, Subdivision and Land Development.
(2) General information.
(a) Name or identifying title of project and tax parcel number.
(b) Name and address of the record owner, applicant and developer.
(c) Name and address of the individual who prepared the plan.
(d) A location map for the purpose of locating the site, at a scale not less than 800 feet to the inch, showing the relation of the tract to adjoining property and to all streets, roads and municipal boundaries existing within 1,000 feet of any part of the tract.
(e) Plan date and date of latest revision to plan, North point, graphic scale and written scale.
(f) Note on plan indicating any area that is to be offered for dedication.
(g) Certificate, signed and sealed by an individual registered in the Commonwealth of Pennsylvania and qualified to perform such duties, indicating compliance with the stormwater management plan application.
(h) Total acreage of tract.
(i) Existing and proposed impervious area.
(3) Existing features.
(a) Complete outline survey of the property to be subdivided or developed shall be provided showing all courses, distances and area and tie-ins to all adjacent intersections.
(b) The location, names and widths of streets; the location of property lines and names of owners; the location' of sanitary sewers, storm drains and similar features within 400 feet of any part of the land to be subdivided or developed; the location of streams, lakes, ponds or other watercourses outside the project area which will be affected by runoff from the project.
(c) The location, size and ownership of all underground and aboveground utilities and services (e.g., wells, on-site sewage disposal systems) and any rights-of-way or easements within the property. Include the PA One-Call serial number
(d) The location of existing buildings, streets and other significant features within the property; the location and area of all floodplains, riparian corridors, woods, forests, lakes, ponds, watercourses (including drainage swales), wetlands, slopes 10% to 15%, steep slopes 15% to 25%, steep slopes 25% or steeper.
(e) Contours at vertical intervals of two feet. One-foot intervals shall be shown on lands with any slope of 5% or less. Contouring shall be in compliance with the National Map Accuracy Standards.
(f) An overlay showing soil types, boundaries, limitations for proposed uses and a statement as to how the soils data was obtained. Include soil data from Montgomery County Soil Survey.
(g) Watershed boundaries applicable to the site.
(h) All trees eight inches in diameter or larger.
(i) Tree masses.
(j) Boundary monumentation.
(k) Easements and restrictions of record.
(4) Proposed features.
(a) Proposed land use, total number of lots and dwelling units and extent of commercial, industrial or other nonresidential uses.
(b) Locations and dimensions of all proposed streets, sidewalks, lot lines, setbacks, building locations, parking compounds, impervious and semiimpervious surfaces (total area), sanitary sewer facilities, water facilities and areas proposed for public dedication.
(c) Proposed changes to land surface and vegetative cover, including areas to be cut or filled as shown on a plan for surface drainage.
(d) Final contours at vertical intervals of two feet. One-foot intervals shall be shown on lands with any slope of 5% or less.
(e) Plans and profiles of proposed stormwater management facilities, including horizontal and vertical location, size and type of material. This information shall be of the quality required for the construction of all facilities and include all calculations, assumptions and criteria used in the design of the facilities; a schedule for installation of such facilities; and a proposed schedule of inspections which will be performed by the applicant's engineer or designee in company with the Township Engineer.
(f) The locations of septic tank infiltration areas and wells when infiltration methods, such as cisterns, seepage beds or trenches, infiltration basins or porous pavement are used. Also soil percolation tests and submission of the percolation data and test locations to substantiate percolation rates used in the drainage calculations.
(g) Plans and profiles of all erosion and sedimentation control measures, temporary as well as permanent, including all calculations, assumptions and criteria used in designing the controls and a schedule for their implementation.
(h) An encroachment map which illustrates all natural features and a preliminary regrading plan which illustrates all disturbance of the identified natural feature areas; the amount of each natural feature disturbed indicated and illustrated on the encroachment map.
(i) Rights-of-way and/or easements proposed to be created for all drainage purposes, utilities or other reasons.
(j) Construction sequence.
(k) Street and parking lot grades.
(l) Landscaping.
(m) Features to be demolished.
C. Description of an ownership and maintenance program, in a recordable form, that clearly sets forth the ownership and maintenance responsibility for all temporary and permanent stormwater management facilities to the satisfaction of the Township Solicitor, including the following:
(1) Description of the method and extent of the maintenance requirements.
(2) When maintained by a private entity, identification of a responsible individual, corporation, association or other entity for ownership and maintenance. Deed covenants and restrictions must be submitted to provide for maintenance by this entity, and the legally handing document must provide that the Township shall have the right to:
(a) Enter the property and inspect the facilities at any time.
(b) Require the private entity to take corrective measures and assign the private entity reasonable time periods for any necessary action.
(c) Authorize maintenance to be done by the Township and lien the cost of the work against the properties of the private entity responsible for maintenance.
(d) Be provided with a yearly maintenance report by a qualified professional. Two copies to be forwarded to the township and one copy to the Township Engineer.
(3) Where the stormwater management plan proposes that the Township own or maintain the facilities, a description of the methods, procedures and the extent to which any facilities shall be turned over to the Township.
(4) Stormwater management easement area shown and recorded in the Office of the Recorder of Deeds.
D. Financial security for the completion of stormwater management facilities.
E. Maintenance guaranty.
F. When a stormwater management plan is submitted in sections, a generalized stormwater management plan for the entire project site shall be submitted in addition to the detailed stormwater management plan for the proposed section. This generalized plan shall demonstrate how the stormwater of the proposed section will relate to the entire development. If temporary facilities are required for construction of a section, such facilities shall be included in the submitted stormwater management plan.