The following items shall be included in the SWM site plan:
A. Appropriate sections from the Municipality’s Subdivision and Land Development Ordinance, and other applicable local ordinances, shall be followed in preparing the SWM site plans. In instances where the Municipality lacks subdivision and land development regulations, the content of SWM site plans shall follow the county’s Subdivision and Land Development Ordinance.
B. The Municipality shall not approve any SWM site plan that is deficient in meeting the requirements of this Chapter. At its sole discretion and in accordance with this Part, when a SWM site plan is found to be deficient, the Municipality may either disapprove the submission and require a resubmission, or in the case of minor deficiencies, the Municipality may accept submission of modifications.
C. Provisions for permanent access or maintenance easements for all physical SWM BMPs, such as ponds and infiltration structures, as necessary to implement the Operation and Maintenance (O&M) Plan discussed in paragraph E.10 below.
D. The following signature block for the Municipality:
“Borough Engineer, on this date (Signature date), has reviewed and hereby certifies that the SWM site plan meets all design standards and criteria of the Municipal Ordinance No. 643.”
E. The SWM site plan shall provide the following information:
(1) The overall stormwater management concept for the project.
(2) A determination of site conditions in accordance with the BMP Manual4. A detailed site evaluation shall be completed for projects proposed in areas of carbonate geology or karst topography, and other environmentally sensitive areas, such as brownfields.
(3) 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 § 26-301.
(4) Expected project time schedule.
(5) A soil erosion and sediment control plan, where applicable, as prepared for and submitted to the approval authority.
(6) 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.
(7) Plan and profile drawings of all SWM BMPs, including drainage structures, pipes, open channels, and swales.
(8) SWM site plan shall show the locations of existing and proposed on-lot wastewater facilities and water supply wells.
(9) The SWM site plan shall include an O&M Plan for all existing and proposed physical stormwater management facilities. This plan shall address long-term ownership and responsibilities for O&M as well as schedules and costs for O&M activities.
(10) A justification must be included in the SWM site plan if BMPs other than green infrastructure methods and LID practices are proposed to achieve the volume, rate and water quality controls under this Chapter.
F. Stormwater management plan contents. Stormwater management plans shall be prepared by professionals registered in the Commonwealth of Pennsylvania to perform such duties. Designs which entail engineering expertise shall be prepared by engineers with appropriate expertise. The plan shall show, be accompanied by, or be prepared in accordance with the following:
(1) General.
(a) The plan shall be clearly and legibly drawn at a scale of 10 feet, 20 feet, 30 feet, 40 feet, 50 feet, or 100 feet to the inch. Profile plans shall maintain a ratio of 1:10 vertical to horizontal.
(b) The sheet size shall be 24 inches by 36 inches maximum. If the plan is prepared in two or more sections, a key map showing the location of the sections shall be placed on each sheet. If more than one sheet is necessary, each sheet shall be numbered to show the relationship to the total number of sheets in the plan (e.g., Sheet 1 of 5).
(c) Plans shall be legible in every detail.
(d) Name and address of landowner, applicant, and individual who prepared the plan.
(e) Plan date and date of latest revision to plan, north point, graphic scale and written scale.
(f) Location map, drawn to scale, relating the property to at least two intersections of existing road centerlines, including the approximate distance to the intersection of the centerlines of the nearest existing street intersection.
(7) Note on plan indicating any area that is proposed to be offered for dedication to the Borough. Any area that is easemented and not to be offered for dedication shall be identified along with a statement that the Borough is not responsible for the maintenance of any area not dedicated to and accepted for public use.
(8) Certificate, signed and sealed by an individual registered in the Commonwealth of Pennsylvania and qualified to perform such duties, indicating compliance with the provisions of this Part (see Appendix D).
(2) Existing Features.
(a) Tract boundaries showing distances, bearings and curve data, as located by field survey or deed plotting, total acreage of tract, and total acreage of project if less than the entire tract.
(b) Existing contours, at a minimum vertical interval of two feet for land with average natural slope of 4% or less and at a minimum vertical interval of five feet for more steeply sloping land. Contours shall be accompanied by the location of the benchmark within or immediately adjacent to the subject tract and a notation indicating the datum used. The United States Geodetic Survey shall be used for benchmark datum.
(c) Names of all owners of all immediately adjacent land, names of all proposed or existing developments immediately adjacent, and locations and dimensions of any streets or easements shown thereon.
(d) Names, locations and dimensions of all existing buildings, street rights-of-way, railroads, utilities, watercourses, drainage facilities, floodplains, wetlands, on-lot sewage disposal facilities, easements, and other significant features located either within and adjacent to the property or 200 feet from the property.
(e) The size, slope capacity, material, elevation and condition of the existing stormwater management system and any other facility that may be used to convey storm flows.
(f) Soil types as designated by the U.S. Department of Agriculture, Soil Conservation Service, Soil Survey of Perry County.
(g) Designation of the location of on-site and off-site sub-watersheds.
(h) Designation of the location of the time of concentration for the on-site and off-site sub-watersheds.
(3) Proposed Features.
(a) Proposed land use, total number of lots and dwelling units, and extent of commercial, industrial or other non-residential uses.
(b) Locations and dimensions of all proposed streets, sidewalks, lot lines, building locations, parking compounds, impervious and semi-impervious surfaces, sanitary sewer facilities, water facilities, stormwater management facilities, utilities, and other significant features. This information shall be provided to the detail necessary to construct the facilities.
(c) Proposed changes to land surface and vegetative cover including areas to be cut or filled.
(d) Proposed topographical data. This information shall be provided by contour lines indicating the existing and proposed grades of the site. Contour lines shall be provided at one foot vertical intervals for slopes of 10% or less, and at vertical intervals of five feet for more steeply sloping land.
(e) Plans and profiles of proposed stormwater management facilities including horizontal and vertical location. Additionally, a detail with all pertinent construction requirements shall be provided for outlet structures. This information shall be of the quality required for the construction of all facilities.
(f) The size, slope, capacity, material, elevation, and condition of the proposed stormwater management system and other facility that may be used to convey storm flows. This information shall include invert elevations and top of grate elevations.
(g) Plans and profiles of all erosion and sedimentation control measures, temporary as well as permanent.
(h) Designation of the location of on-site sub-watersheds.
(i) Designation of the location of the time of concentration for the on-site sub-watersheds.
(4) Written Report and Calculations.
(a) Calculations, assumptions, criteria, methodology, and references used in the design of stormwater management facilities, the establishment of capacities, and the pre-development and post-development peak discharge. This information shall include data on all sub-watersheds.
(b) For all basins, a plotting or tabulation of the storage volumes and discharge curves with corresponding water surface elevations, inflow hydrographs and outflow hydrographs.
(c) Geotechnical report addressing all proposed groundwater recharge methods of stormwater management, such as seepage pits, beds, trenches, basins.
(d) Representative percolation tests shall be made throughout the proposed area in accordance with PA BMP manual.
(e) Description of all erosion and sedimentation control measures, temporary as well as permanent, including the staging of land moving activities, sufficient in detail to clearly indicate their function. All erosion and sedimentation control measures shall conform to the requirements of the Pennsylvania Department of Environmental Protection, Soil Erosion and Sedimentation Control Manual.
(f) Description of an ownership and maintenance program, in a recordable form, that clearly sets forth the ownership and maintenance responsibilities for all temporary and permanent stormwater management facilities which shall include the following:
1) Description of the method and extent of the maintenance requirements.
2) Identification of an individual, corporation, association or other entity responsible for ownership and maintenance.
3) When maintained by a private entity, a copy of the legally binding document which provides that the Borough shall have the right to:
(i) Inspect the facilities at any time.
(ii) Require the private entity to take corrective measures and assign the private entity reasonable time periods for any necessary action.
(iii) Authorize maintenance to be done by the Borough or an agent or contractor of the Borough and the liening of the cost of the work against the properties of the private entity responsible for the maintenance.
(Ord. 643, 10/10/2022)