1. Appropriate sections from the Township’s Subdivision and Land Development Ordinance, and other applicable local ordinances, shall be followed in preparing the SWM site plans. In instances where the Township lacks subdivision and land development regulations, the content of SWM site plans shall follow the county’s Subdivision and Land Development Ordinance.
2. The Township 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 Township may either disapprove the submission and require a resubmission, or in the case of minor deficiencies, the Township may accept submission of modifications.
3. 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 subsection 5.P. below.
A. A minimum 20-foot-wide drainage easement shall be provided for all stormwater management facilities. Drainage easements shall provide for ingress and egress to a public right-of-way.
B. A minimum 20-foot-wide drainage easement shall be provided where the conveyance, treatment, of stormwater, either existing or proposed, is identified on the storm water management plan. Drainage easements shall be provided to contain and convey the 100-year storm event.
C. A note on the stormwater management plan indicating that nothing shall be placed, planted, set, or put within the area of an easement. No alterations to swales, basins, BMPs, or other stormwater management shall be permitted, without prior approval.
D. Stormwater management facilities not located within a public right-of-way shall be contained in and centered within a drainage easement. Easements shall follow property boundaries where possible.
4. The following signature block for the Township: “(design professional)”, on this date (signature date), hereby certifies that the SWM site plan meets all design standards and criteria of the Municipal Ordinance No. (number assigned to ordinance).”
5. The SWM site plan shall provide the following information:
A. A written report including an overall project description of the proposed stormwater management concepts, including a summary identifying specific LID and Green Infrastructure practices and the existing site conditions. Including stormwater runoff calculations for both predevelopment and postdevelopment conditions, including complete hydrologic, hydraulic, and structural computations for all stormwater management facilities.
B. 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.
C. All calculations, assumptions, and criteria used in the design of the stormwater management facilities must be shown. If multiple facilities are used in conjunction with each other, such as infiltration BMPs with vegetation-based management practices, a summary narrative shall be included describing any sequencing and how the facilities are meant to function with each other to manage stormwater runoff in accordance with this Chapter.
D. The sheet sizes shall be either 11 inches by 17 inches, 18 inches by 24 inches or 24 inches by 36 inches. If the plan is prepared in two or more drawing sheets, a full-size drawing and key map showing the location of the sheets and a match line shall be placed on each sheet. Each sheet shall be numbered to show the relationship to the total number of sheets in the plan set.
E. Proposed name or identifying title of project.
F. Name and address of the landowner and applicant of the project site.
G. The limit of disturbance (LOD) shall be shown with its area labeled in square feet or acres.
H. Plan date and date of the latest revision to the plan, north point, graphic scale and written scale. All plans shall be drawn at a scale sufficient to determine consistency with this and other municipal ordinances.
I. A table on the plan indicating the total acreage of the project site and the tract of land on which the project site is located, assumed square footage of impervious surface for each lot, and the assumed square footage of impervious surface permitted for each stormwater management facility.
J. A location map, for the purpose of locating the project site to be developed, at a minimum scale of 1,000 feet to the inch, showing the relation of the tract to adjoining property and to all streets and the Township boundaries existing within 400 feet of any part of the tract of land on which the project site is proposed to be developed.
K. A soil erosion and sediment control plan, where applicable, as prepared for and submitted to the approval authority as well as the Township.
L. 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.
M. A hydrogeologic assessment of the effects of stormwater runoff on sinkholes, where present.
N. Plan and profile drawings of all SWM BMPs, including drainage structures, pipes, open channels, and swales. All plans and profiles should align vertically on the sheets for reference. All utility crossings shall be shown on these profiles.
O. SWM site plan shall show the locations of existing and proposed on-lot wastewater facilities and water supply wells.
P. 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.
Q. 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.
R. A description of permanent stormwater management techniques, including the construction specifications and the materials to be used for stormwater management facilities.
S. A notarized signature of the owner of the parcel for which the SWM site plan is proposed indicating that they are aware of and will be responsible for operation and maintenance of the facilities.
T. A list of all requested waivers to the stormwater management ordinance or a statement identifying that the stormwater management plan is not requesting waivers to the stormwater management ordinance.
U. Existing features.
(1) Tract boundaries showing distances, bearings, and curve data, as located by field surveyor by deed plotting.
(2) Existing contours at vertical intervals of one or two feet for land with an average natural slope of 20% or less and at vertical intervals of five feet for more steeply sloping land. The location of the benchmark and the datum used shall also be indicated.
(3) The names of all owners of all immediately adjacent unplatted land and the locations and dimensions of any streets or easements shown thereon.
(4) The names, locations, and dimensions of all existing streets, railroads, watercourses, drainage facilities, floodplains, streams, lakes, ponds, and other water bodies, existing drainage courses, Karst features, and other significant features within 200 feet of any part of the tract proposed to be developed and the location of all buildings and structures.
(5) Other physical features including wetlands, sinkholes, areas of native vegetation to be preserved, including trees greater than two inches in diameter at breast height, woodlands, other environmentally sensitive areas, and the total extent of the upstream area draining through the project site.
(6) The locations of all existing utilities, including on-lot disposal systems and wells, sanitary sewers, and water lines within 200 feet of the property lines.
(7) Soil boundaries and soil types as designated by the NRCS.
(8) Existing zoning districts and property line setbacks.
V. Proposed features.
(1) The proposed land use, the number of lots and dwelling units and the extent of commercial, industrial or other nonresidential uses.
(2) The locations and dimensions of all proposed streets, parks, playgrounds, and other public areas, sewer and water facilities; lot lines and building locations, and parking compounds, driveways, paved areas and other impervious surfaces.
(3) The proposed changes to land surface and vegetative cover including areas to be cut or filled.
(4) Proposed contours at vertical intervals of two feet for land with an average natural slope of 15% or less and at vertical intervals of five feet for more steeply sloping land.
(5) Finished elevations on tops of curbs at lot lines projected and lot corners. Elevations shall be shown to the nearest tenth of a foot.
(6) A summary table depicting the minimum lowest floor elevation, which includes the basement for all lots located immediately adjacent to the floodplain area.
(7) The location of any proposed on-lot disposal system, replacement drainfield easements, and water supply wells.
(8) The location of any proposed signage identifying the constructed BMP. Proposed signage shall be installed on any nonresidential property or property under the control of a homeowners association or community association.
W. A summary table on the plan identifying all BMPs including BMP 10, drainage area to the BMP, name of receiving waterbody, the BMP’s inspection and maintenance frequency, name of responsible person or organization at the time of stormwater management plan approval, and the lot numbers where the BMP is located.
X. The name of the development, the name and address of the owner of the property, and the name and address of the individual or firm preparing the plan. Also to be included are the name, address, signature and seal of any registered surveyor, professional engineer, landscape architect, or professional geologist (for geomorphological assessments) contributing to and/or with a responsibility for any aspect of the plan where applicable.
Y. A planting plan is required for all vegetated stormwater BMPs.
(1) Native or naturalized/non-invasive species suitable to the soil and hydrologic conditions of the site shall be used unless otherwise specified in the BMP Manual.
(2) Invasive vegetation may not be included in any planting schedule. (See Invasive Plants in Pennsylvania as published by the Department of Conservation and Natural Resources.)
(3) The limit of existing, native vegetation to remain shall be delineated on the plan along with proposed construction protection measures.
(4) Prior to construction, a tree protection zone shall be delineated at the dripline of the tree canopy. The tree protection zone of trees scheduled to remain shall be marked. Groups of trees may be marked by a protection zone along the outermost drip line boundary. A 48-inch-high snow fence or 48-inch- high construction fence mounted on steel posts located eight feet on center shall be placed along the tree protection boundary. No construction, storage of material, temporary parking, pollution of soil, or regrading shall occur within the tree protection zone.
(5) All planting shall be performed in conformance with good nursery and landscape practice. Plant materials shall conform to the standards recommended by the American Association of Nurseryman, Inc. in the American Standard of Nursery Stock.
(a) Planting designs are encouraged to share planting space for optimal root growth whenever possible.
(b) No staking or wiring of trees shall be allowed without a maintenance note requiring the stake and/or wire to be removed within one year of planting.
(Ord. 2022-01, 7/25/2022)