The SWM site plan shall consist of a general description of the project, including calculations, maps, and plans. A note on the maps shall refer to the associated computations and E&S control plan by title and date. The cover sheet of the computations and E&S control plan shall refer to the associated maps by title and date. All SWM site plan materials shall be submitted to Newtown Borough in a format that is clear, concise, legible, neat, and well organized; otherwise, the SWM site plan shall not be accepted for review and shall be returned to the applicant. The following items shall be included in the SWM site plan:
A. General.
(1) General description of the project, including plan contents described in §
473-18B.
(2) General description of proposed SWM techniques to be used for SWM facilities.
(3) Complete hydrologic and hydraulic computations for all SWM facilities.
(4) All reviews and letters of adequacy from the Conservation District for the erosion & sedimentation plan as required by Newtown Borough, Bucks County or state regulations.
(5) A general description of proposed nonpoint source pollution controls.
(6) The SWM site plan application and completed Fee Schedule form and associated fee for all regulated activities not already paying fees under Chapter
486, Subdivision and Land Development, or other municipal regulations. (Appendix C-1).
(7) The SWM site plan checklist (Appendix C-2).
(8) Appropriate sections from Chapter
486, Subdivision and Land Development, and other applicable local ordinances, shall be followed in preparing the SWM site plan.
B. Plans. SWM site plan shall provide the following information;
(1) The overall stormwater management concept for the project.
(2) A determination of natural site conditions and stormwater management needs. This shall include, but not be limited to:
(a) Site features:
[1] The location of the project relative to highways, municipal boundaries or other identifiable landmarks.
[2] The locations of all existing and proposed utilities, sanitary sewers, and water lines on site and to within 50 feet of property lines.
[3] Proposed structures, roads, paved areas, and buildings.
[4] The total tract boundary and size with distances marked to the nearest foot and bearings to the nearest degree.
[5] Plan and profile drawings of all SWM BMPs, including drainage structures, pipes, open channels, and swales. At a minimum this should include pre- and post-drainage area maps, an overall post-construction stormwater management plan, stormwater details sheets, and landscape plans (if proposing bioretention facilities, low impact development, bioretention, or vegetative basins).
[6] The locations and minimum setback distances of existing and proposed on-lot wastewater facilities and water supply wells.
[7] The location of all erosion and sediment control facilities.
[8] The location of proposed septic tank infiltration areas and wells in cases where groundwater recharge measures such as seepage pits, beds or trenches are proposed.
(b) Natural site conditions:
[1] An existing resource and site analysis map (ERSAM) showing environmentally sensitive areas including, but not limited to, steep slopes, ponds, lakes, streams, wetlands, hydric soils, hydrologic soil groups A and B, vernal pools, stream buffers, open channels, existing recharge areas, and floodplains. The area of each of these sensitive areas shall be calculated and should be consistent with the runoff volume calculation §
473-13C(1).
[2] A detailed site evaluation for projects proposed in areas of frequent flooding, karst topography, and other environmentally sensitive areas, such as brownfields and source water protection areas.
[3] Existing and proposed contour lines (two feet).
[4] The total extent of the drainage area upstream from the site and all downgradient receiving channels, swales and waters to which stormwater runoff or drainage will be discharged.
(c) Stormwater runoff design computations and documentation as specified in this chapter, or as otherwise necessary to demonstrate that the maximum practicable measures have been taken to meet the requirements of this chapter, including the recommendations and general requirements in §
473-11.
(d) The effect of the project (in terms of runoff volumes, water quality, and peak flows) on surrounding properties and aquatic features and on any existing stormwater conveyance system that may be affected by the project.
(3) The format of the plan shall include the following:
(a) The expected project time schedule.
(b) The name of the development, the name and address of the owner of the property, and the name of the individual or firm preparing the plan.
(d) A graphic and written scale of one inch equals no more than 50 feet; for tracts of 20 acres or more, the scale shall be one inch equals no more than 100 feet.
(f) An access easement around all stormwater management facilities is required that would provide ingress to and egress from a public right-of-way. The size of the easement shall be commensurate with the maintenance and access requirements determined in the design of the BMP.
(g) A key map showing all existing man-made features beyond the property boundary that would be affected by the project.
(h) A note on the plan indicating the location and responsibility for maintenance of stormwater management facilities. All facilities shall meet the performance standards and design criteria specified in this chapter.
(i) The following signature block for the design engineer: "I, (design engineer), on this date (date of signature), hereby certify that the SWM site plan meets all design standards and criteria of the Neshaminy Creek Watershed Act 167 Stormwater Management Ordinance or Plan."
(j) A statement, signed by the applicant, acknowledging that any revision to the approved SWM site plan must be approved by Newtown Borough and that a revised E&S plan must be submitted to the Conservation District.
(4) A soil erosion and sediment control plan, where applicable, as prepared for and submitted to the approval authority.
(5) The SWM site plan shall include an operations and maintenance (O&M) plan for all existing and proposed physical stormwater management facilities, as well as schedules and costs for O&M activities. This plan shall address long-term ownership and responsibilities for O&M.