SWM Site Plan materials shall be submitted to the Township 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. 
Project Information.
(1) 
Project name.
(2) 
Project address.
(3) 
Name and address of applicant and, if separate from applicant, property owner.
(4) 
Name and address of the qualified professional responsible for project design.
(5) 
Applicable tax parcel ID number(s).
B. 
Project description.
(1) 
General description of the project.
(2) 
Existing and proposed land use(s).
(3) 
Expected project time schedule and estimated construction duration.
(4) 
General description of proposed SWM techniques, SWM and Conveyance Facilities, and overall stormwater management concept for the project.
(5) 
General description of proposed ESC techniques and facilities and a note referencing a separate ESC Plan by title and date.
(6) 
A general description of nonpoint source pollution controls.
(7) 
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.
(8) 
If methods other than LID and green infrastructure are proposed to achieve the stormwater controls required under this chapter, provide a detailed justification demonstrating that the use of LID and green infrastructure is not practicable.
C. 
Date of submission, and the dates of all revisions.
D. 
Graphical and written scale on all drawings, maps, details, profiles, and other items as necessary. The plan scale shall be 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.
E. 
North arrow.
F. 
Location map at a minimum scale of one inch equals 800 feet showing the relation of the tract to adjoining property and to all streets, roads, municipal boundaries, and other identifiable landmarks existing within 800 feet of any part of the subject property.
G. 
Lot size in acres and square feet and metes and bounds of the entire tract perimeter marked to the nearest foot and bearings to the nearest degree.
H. 
Existing and proposed contours at intervals of one or two feet.
I. 
A key may showing all existing man-made features beyond the property boundary that would be affected by the project.
J. 
A determination of site conditions in accordance with the BMP Manual and this chapter. A detailed site evaluation shall be completed for projects proposed in environmentally sensitive areas such as brownfields.
K. 
Soil names, depths, slopes, boundaries, hydrologic soul group classification, and limitations.
L. 
Location of all existing and proposed on-site improvements, including but not limited to structures, buildings, and impervious surfaces.
M. 
The characteristics of the regulated activities, including the past, present and proposed land uses and vegetative covers and the proposed alteration to the project site.
N. 
Location of improvements outside of the property boundary that may be affected by the project.
O. 
Location of all existing and proposed utilities and utility easements on-site and within 50 feet of the property line, including but not limited to on-lot wastewater facilities, water supply wells, sanitary sewers, water lines, gas lines, electric lines, and communications lines. On-lot wastewater facilities and water supply wells shall not be installed within 100' of each other and SWM Facilities. This setback shall be identified on the plan.
P. 
An Existing Resource and Site Analysis Map (ERSAM) showing the location of all environmentally sensitive features including, but not limited to, woodlands, steep slopes, ponds, lakes, streams, wetlands, vernal pools, stream buffers, open channels, existing recharge areas, floodplains, and significant karst features (including but not limited to sinkholes, rock pinnacles, and closed depressions). If no sensitive natural features are present on the site, provide a note as listed in § 173-24DD(8) below, and provide evidence of their absence. See § 173-26B below for further requirements on the identification of wetlands.
(1) 
The area of each environmentally sensitive feature shall be calculated and identified on the plan in acres and square feet.
(2) 
The location of all surface waters of this Commonwealth that may receive runoff from the project site and their classification under 25 Pa. Code Chapter 93 shall be included in the ERSAM.
Q. 
Location and clear identification of the type of permanent SWM and Conveyance Facilities and BMPs.
R. 
Proposed limit of disturbance line(s), disturbed area, project site boundary, areas protected from disturbance in acres and square feet, and site access.
S. 
Construction details and material schedules including data necessary for proper construction.
T. 
Plan and profile drawings of all ESC, SWM and Conveyance Facilities, and BMPs including but limited to basins, drainage structures, pipes, open channels, sediment traps, and swales.
(1) 
Plan and profiles for the same facilities shall be displayed together on the same sheet.
(2) 
All facilities shall be clearly labeled, with labels matching calculations and designations within the SWM Report.
(3) 
All plans and profiles shall provide clear labels of applicable data necessary for proper construction, including but not limited to inverts, top of grate elevations, pipe slopes, materials, spillway elevations and widths, outlet structure elevations, orifice sizes and elevations, basin bottom elevations, etc.
(4) 
Plans and profile drawings may take the place of, supplement, or be combined with construction details where desired as long as the above standards and overall design clarity are maintained.
U. 
A landscape plan including the type, location, and number of landscaping plantings specification for all temporary and permanent ground covers and for all stormwater management facilities. The specification shall be specified for each type of SWM Facility.
V. 
Pre- and post-drainage area maps as described in § 173-25D.
W. 
Location and results of all on-site infiltration testing and soil characterization for SWM Facilities and percolation tests for on-lot wastewater facilities.
X. 
An erosion and sediment control (ESC) plan. Note that further review by the county conservation district/reviewing authority may be required per § 173-12L. The ESC Plan shall include the following:
(1) 
All SWM Site Plan requirements.
(2) 
A narrative description of the location and type of perimeter and on-site BMPs used before, during and after the earth disturbance activity.
(3) 
A sequence of BMP installation and removal in relation to the scheduling of earth disturbance activities, prior to, during and after earth disturbance activities that ensure the proper functioning of all BMPs. This schedule shall include a schedule of inspections for critical states of stormwater facility installation.
(4) 
A maintenance program which provides for the operation and maintenance of BMPs and the inspection of BMPs on a weekly basis and after each stormwater event, including repair or replacement of BMPs to ensure effective and efficient operation. The program must provide for completion of a written report document each inspection and all BMP repair, or replacement and maintenance activities.
(5) 
Procedures which ensure that the proper measures for the recycling or disposal of materials associated with or from the project site will be undertaken in accordance with conservation district and DEP requirements.
(6) 
Identification of potential thermal impacts to surface waters of this Commonwealth from the earth disturbance activity including BMPs to avoid, minimize or mitigate potential pollution from thermal impacts.
(7) 
Identification of naturally occurring geologic formations or soil conditions that may have the potential to cause pollution after each disturbance activities are completed and SWM facilities are operation and development of a management plan to avoid or minimize potential pollution and its impacts, including but not limited to sinkholes and other karst features.
Y. 
An O&M Plan for all existing and proposed physical stormwater management facilities in accordance with § 173-36. This plan shall address short-term and long-term responsibilities for O&M which includes inspection of SWM facilities and includes the repair, replacement, and routine maintenance of the SWM facilities to ensure proper long-term function and operation. The plan must 1) include schedules for inspections and routine maintenance; 2) provide for completion of a written report documenting each inspection and all SWM repair and maintenance activities; and 3) describe access to the SWM facilities. The O&M Plan must stipulate that all documentation must be retained by the entity responsible and be made available for inspection upon request. The O&M procedures identified by DEP must be used unless alternative procedures are approved by the Township.
Z. 
SWM Conservation Easements for all structural and non-structural SWM Facilities, Conveyance Facilities, BMPs, and designated meadows. When present, provisions for permanent access to SWM Conservation Easements shall also be granted to the Township via a note as listed in § 173-24DD(9) below.
(1) 
Easements shall be a minimum of 30' in width, and must extend at least 5' beyond the edge or top of bank of any SWM facility.
(2) 
Where possible, easements should be centered on the facilities within the easements.
(3) 
Easements located adjacent to a structure do not need to be a minimum of 30' in width and shall be adjusted to fit the site accordingly to the Township Engineer's satisfaction.
(4) 
Except for flatwork (i.e., asphalt, sidewalk, etc.) or lawn, nothing shall be placed, stored, erected, constructed over, planted, or otherwise located within an easement other than the SWM facilities within the easement. If SWM conservation easements are required on the site, provide a note stating such as listed in § 173-24DD(10) below.
(5) 
Easements shall be identified with metes and bounds. In the case of conveyance facilities such as pipes and swales, and if desired by the applicant, a note as listed in § 173-24DD(11) below may be added to the plan in lieu of metes and bounds stating that easements are to be located and offset from the center of the installed conveyance facility. Subterranean facilities utilizing this alternative easement identification method shall use metal marking tape - or other methods that provide simple identification from the surface as reviewed and accepted by the Township Engineer - in order to mark the location of said facilities; subsurface conveyance facilities shall add the identification method to the note required above, and the identification method shall be added to relevant construction details.
(6) 
Roof leader manifolds and discharges shall also require SWM Conservation Easements, but may be sized less than 30' in width, and are exempt from the requirement in § 173-24Z(3) above as long as the items above the manifolds and/or discharges do not negatively affect their function.
AA. 
An assignment of impervious area to each individual lot that may not be exceeded at the time of construction and is accounted for in the SWM Report.
BB. 
A list of any permits or authorizations related to stormwater management, erosion and sediment control, waterways and wetlands, or other relevant plan authorizations/permits other than those required by the Township, including but not limited to Conservation District adequacy letters; NPDES permits; PADEP/ACOE water obstruction and encroachments permits; FEMA CLOMR/LOMRs; PNDI clearances; PennDOT HOP approvals when the proposed project encroaches into or impacts a PennDOT right-of-way; and other appropriate permits as determined by the Township. The reviewing authority for each permit shall also be included in this list. If no outside permits are required, provide a note as listed in § 173-24DD(12) below.
CC. 
Reasonable and appropriate plan and drafting requirements, design standards and improvement requirements from Chapter 178, Subdivision and Land Development, Chapter 200, Zoning, and other applicable local ordinances shall be followed in preparing the SWM Site Plan.
DD. 
Notes, signature blocks, and certifications:
(1) 
"(Township Engineer or Township designee), on this date, (signature date), has reviewed and hereby certifies that the SWM Site Plan appears to meet all design standards and criteria of the stormwater management ordinance. Strict compliance with the stormwater management ordinance, however, is the responsibility of the applicant."
(2) 
"(Applicant or owner), on this date, (signature date), acknowledges that SWM and Conveyance Facilities and BMPs are permanent fixtures and may not be modified, removed, filled, landscaped, or otherwise altered without written approval of Lower Makefield Township."
(3) 
"(Qualified profession responsible for project design), on this date, (signature date), certified that this plan complies with the ordinances, provisions, and regulations of the Township and any other applicable entities." A seal and dated signature shall accompany this statement.
(4) 
"Lower Makefield Township is not responsible for the maintenance of any area not dedicated to an accepted for public use."
(5) 
"The Operation and Maintenance Agreement and Plan is part of the plan. If the Owner fails to adhere to the terms of the agreement and plan, the Township may perform the services required and charge the owner appropriate fees."
(6) 
If Conveyance Facilities are proposed that require watertight joints, "All stormwater conveyance facilities shall be constructed with watertight joints."
(7) 
If inlets or other structures are proposed, "The knocking out of inlet or other structure corners is prohibited."
(8) 
If no sensitive natural features are present on the site per § 173-24P above, "(Qualified professional responsible for project design), on this date, (signature date), certifies that there are no environmentally sensitive features on the project site including, but not limited to, woodlands, steep slopes, ponds, lakes, streams, wetlands, vernal pools, stream buffers, open channels, existing recharge areas, floodplains, and significant karst features."
(9) 
If SWM Conservation Easements and/or Riparian Buffer Easements are required on the site per § 173-14C and/or § 173-24Z above, "The Landowner hereby grants permission to the Township, its authorized agents, and employees access to any and all SWM Conservation Easements and Riparian Buffer Easements on the property."
(10) 
If SWM Conservation Easements are required on the site per § 173-24Z above, "Except for flatwork or lawn, nothing shall be placed, stored, erected, constructed over, planted, or otherwise located within an easement other than the SWM Facilities within the easement. SWM Facilities must be protected and maintained to function as designed. If the entity identified in this easement as responsible for maintenance fails to properly address deficiencies identified in writing by the Township, the District, DEP, or other government agency within 180 days of receiving written notice of the deficiency, the Township, the District, DEP, or other government agency may cause the maintenance to be performed. The full cost of the maintenance may be billed to the entity identified as responsible for maintenance." Additionally a note must be placed on the Plan identifying the party responsible for assuring the continued functionality and performing required maintenance of any easement.
(11) 
If any easements on the site are to be located based upon the location of conveyance facilities per § 173-24Z(5) above, "SWM conservation easements for conveyance facilities shall be located and offset from the center of the respective conveyance facility as installed." If the conveyance facilities are subterranean, also add, "Underground conveyance facilities can be identified from the surface via (identification method)."
(12) 
If no outside permits are required per § 173-24BB above, "(Qualified professional responsible for project design), on this date, (signature date), certifies that no stormwater management, erosion and sediment control, waterways and wetlands, and/or other relevant plan authorizations/permits are required other than those of the Township."
(13) 
"The SWM Report is part of the plan."
(14) 
If an as-built plan is required per § 173-33 below, "A copy of the recorded As-Built Plan will be provided to the Township prior to occupancy and/or the release of financial security."
SWM Report materials shall be submitted to the Township in a format that is clear, concise, legible, neat, and well organized; otherwise, the SWM Report shall not be accepted for review and shall be returned to the applicant. The following items shall be included in the SWM Report:
A. 
Project information.
(1) 
Project name.
(2) 
Project address.
(3) 
Name and address of applicant and, if separate from applicant, property owner.
(4) 
Name and address of the qualified professional responsible for project design.
B. 
A project narrative including:
(1) 
General description of the project.
(2) 
Existing and proposed land use(s).
(3) 
Expected project time schedule.
(4) 
Description of pre and postdevelopment conditions.
(5) 
General description of proposed SWM techniques, SWM and Conveyance Facilities, and overall stormwater management concept for the project.
(6) 
General description of proposed ESC techniques and facilities and a note referencing a separate ESC Plan by title and date.
(7) 
A general description of nonpoint source pollution controls.
(8) 
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.
C. 
Stormwater runoff design computations and documentation demonstrating that the requirements of this chapter have been met for all watersheds and subwatersheds, including but not limited to the recommendations, standards, and calculation methodologies specified in Article III. This information shall also include but not be limited to the following:
(1) 
Summary tables of existing and proposed peak rates, and, where required, relevant Act 167 stormwater release rate reductions.
(2) 
Summary tables of the runoff volume control requirements.
(3) 
For applicable SWM Facilities, a plotting and tabulation of the storage volumes and discharge curves with corresponding water surface elevations, inflow hydrographs, and outflow hydrographs.
(4) 
DEP Post-Construction Stormwater Management (PCSM) Spreadsheet.
(5) 
All applicable design worksheets and calculations for SWM and Conveyance Facilities and BMPs.
(6) 
For applicable Conveyance Facilities, a tabulation of open or closed channel flow data, including but not limited to shear stress, erosion, provided freeboard, Manning's N values, etc. (open channel conveyance), and hydraulic grade lines, top of grate elevations, pipe sizes, crown and invert elevations, materials, etc. (closed channel flow).
(7) 
Breakouts of Tc calculation segments and input data for each segment, including but not limited to slope, length, Manning's N values, etc.
(8) 
Summary tables of curve number (CN) and runoff coefficient (C) calculation averages for all watershed and/or subwatersheds.
(9) 
A plotting or tabulation of the rainfall depths or intensities used in modeling.
(10) 
Supporting calculations as necessary for all ESC Facilities.
(11) 
For all hotspot uses, a narrative description of the required treatment train shall be provided within the SWM Report, and shall detail the total area of runoff received, total volume treated, the total pollutants removed by the SWM BMPs, and the location of the SWM BMPs within the treatment train.
(12) 
The Township has the authority to require that any calculations or modeling be reconciled with field observations, conditions, and site history.
D. 
Watershed/subwatershed maps, which shall include:
(1) 
All points of interests being used in modeling.
(2) 
Existing and proposed watersheds and subwatersheds, including labeling that matches calculations and designations within the SWM Report.
(3) 
Time of concentration (Tc) paths.
(4) 
Inlet and conveyance drainage areas with labels corresponding to receiving inlets and conveyances.
(5) 
Facility labeling that matches calculations and designations within the SWM Site Plan and SWM Report.
(6) 
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.
A. 
Subsurface investigation and infiltration testing.
(1) 
For land development activities proposing to use infiltration SWM Facilities, subsurface investigations and infiltration testing shall be required.
(2) 
For regulated activities that are not considered land development requiring Major SWM Permits proposing to use infiltration SWM Facilities, infiltration testing shall be required.
(3) 
For regulated activities that are not considered land development requiring Minor SWM Permits proposing to use infiltration SWM Facilities, other information — such as soil survey data — supporting the use of infiltration SWM Facilities shall be required as part of the SWM Report.
(4) 
All subsurface investigations shall be conducted in accordance with the following standards:
(a) 
As required, the applicant will conduct a subsurface investigation prior to completing a layout of a development plan. The objective of the preliminary investigation is to obtain data that would allow for the development of a conceptual model of surface runoff and subsurface recharge on a development site. With regard to groundwater recharge, it is important that the applicant, during the site design phase of the project, understand how groundwater recharges at a site. An understanding of these elements will provide the applicant with a guide for infiltration BMPs at the site (i.e., shallow or deep infiltration surfaces) and an understanding of the requirement to maintain the hydrogeologic characteristics of a site. All investigations shall be conducted in accordance with the most recent revision of the BMP Manual and with the criteria listed below. All investigations shall be witnessed by a representative of the Township.
(b) 
Method of investigation.
[1] 
A subsurface investigation comprised of supervised test pits shall be undertaken to characterize the underlying hydrogeologic characteristics of a development site. The frequency of test pits shall be as follows: For a project site size of five acres and below, one test pit shall be provided per acre with a minimum of two test pits. For a project site size greater than five acres and up to 20 acres, five test pits shall be provided plus one per every two acres beyond the initial five acres. For a project site size greater than 20 acres, 13 test pits shall be provided plus one per every five acres beyond the initial 20 acres.
[2] 
All test pits shall be progressed to a minimum depth of 10 feet or to bedrock refusal, whichever is less. The test pits shall be prepared in accordance with USDA National Cooperative Soil Survey (NCSS) standards, and identify all soil horizons and substratums, as well as limiting horizons, evidence of seasonal high groundwater (mottling) and observed groundwater seepage. This field investigation shall be conducted by an ARCPACS or PAPSS certified soil scientist.
[3] 
Utilizing the data obtained through the preliminary subsurface investigation, a Pennsylvania licensed geologist or ARCPACS or PAPSS certified soil scientist shall create a conceptual model of the surface and subsurface drainage patterns of the site for use by the design engineer in developing drainage system layout and infiltration BMPs. The conceptual model shall include estimates of predevelopment recharge of groundwater and a determination of the primary routes for subsurface drainage, either through recharge of on-site or off-site streams or wetlands, or through deeper recharge of regional aquifers. The conceptual model shall also discuss the impacts of the proposed development on adjacent wetlands and streams, and provide schematics or conceptual cross sections of the proposed method of maintaining the existing drainage and recharge patterns. The design engineer, in developing a concept and ultimately designing the site, must match both the predevelopment recharge rates and patterns.
(5) 
All infiltration testing shall be conducted in accordance with the following standards:
(a) 
The purpose of BMP specific infiltration testing is to determine the recharge characteristics and ability of soils and the underlying aquifer to infiltrate the required volume of groundwater. All structural infiltration BMP designs shall be supported by an individual soil log and infiltration test to determine the infiltration rate at each BMP. The soils logs at each BMP will be conducted in the identical manner as in the subsurface investigation, identifying the soil profile, limiting horizons, seasonal high groundwater and observed seepage. A groundwater mounding analysis must be performed in addition to the tests below to determine whether or not the underlying aquifer will be able to manage the infiltration loading proposed without raising the groundwater to within two feet of the infiltration surface or affecting nearby structures. The mounding analysis shall be progressed utilizing at least three groundwater monitoring wells per BMP, and one 172-hour aquifer pumping stress test. The field testing procedure for a mounding analysis shall be submitted to the Township Engineer for review and approval prior to performing the work.
(b) 
At the level of infiltration, testing shall conform to the following frequency:
[1] 
Detention/retention BMPs (i.e., infiltration basins, dry wells/seepage pits, open bottom bioretention, sand filters, rain gardens, infiltration beds, etc.): one test per 5,000 square feet or fraction thereof of infiltrative surface; minimum of one test for up to 400 square feet, and two tests for infiltrative surfaces of 400 square feet and greater.
[2] 
Linear infiltration BMPs (i.e., swales, trenches and strips, etc.): one test per 100 feet or fraction thereof; minimum two tests.
(c) 
Testing procedures.
[1] 
All infiltration testing methods shall be conducted in accordance with the most recent revision of the Manual, as amended from time to time. Double-ring infiltrometer tests alone shall be utilized.
[2] 
There may be instances where the rock content is sufficient enough to limit the use of either the double-ring infiltrometer. In this instance, the following infiltration test may be conducted after approval of the Township:
[a] 
Procedure for a pilot infiltration test (P.I.T.).
[i] 
The following equipment is required for a P.I.T.:
[A] 
Excavating equipment capable of producing a test basin as prescribed in § 173-26A(5)(c)[2][a][ii] below; and
[B] 
A water supply; and
[C] 
A means for accurately measuring the water level within the basin as required in § 173-26A(5)(c)[2][a][iii] below. It is recommended that a calibrated PVC pipe or rod be used to measure the drop.
[ii] 
A pit meeting the following requirements shall be excavated within or immediately adjacent to the proposed infiltration BMP.
[A] 
The bottom of the test basin shall be at the depth of the proposed level of BMP infiltration.
[B] 
The bottom area of the basin shall be a minimum of 50 square feet.
[C] 
A soil profile pit excavated for the purpose of logging the subsurface may be utilized for this test, provided that the requirements of § 173-26A(5)(c)[2][a][ii] above are satisfied.
[D] 
The bottom of the basin should be made as level as possible so that high areas of rock do not project above the water level when the basin is flooded as prescribed in § 173-26A(5)(c)[2][a][iii] below. Within the depth of the pit where water will be filled, the side slopes should be as close to vertical and consistent in dimension as possible.
[E] 
If groundwater is observed within the test basin, the basin flooding test shall not be used.
[iii] 
The following test procedure shall be used for the P.I.T.:
[A] 
Step one: Fill the excavated pit with the approximate depth of water expected to be stored within the specific infiltration BMP (water depths shall be a minimum of 12 inches and no greater than 48 inches) and record the time. Allow the basin to drain for a period of 24 hours. When designing the P.I.T. for a BMP, the designer should be aware that infiltration BMPs must completely drain within a period of 24 to 72 hours after the facility's inflow hydrograph.
[B] 
Step two: If the basin drains completely within 24 hours after the first flooding, immediately refill the basin to the water depths as described in § 173-26A(5)(c)[2][a][iii][A] above and start recording the rate of drop. If the basin has not emptied within 24 hours and the water level has dropped less than six inches, then the soil stratum being tested cannot be used for infiltration. If the water level has dropped six inches or greater, then fill the pit back to the water depth as described in § 173-26A(5)(c)[2][a][iii][A] above and start recording the rate of drop every five minutes to four hours depending on the rate of drop until the pit is empty. If the rate of drop slows to less than 0.25 inches per hour over two consecutive hours, then the tested soil stratum shall not be used for infiltration.
[C] 
Step three: Calculate the rate of infiltration by averaging the time weighted rate of drop from initial filling until the pit has emptied. This rate of infiltration will be used in calculating the drainage time required for the BMP. To account for bio-fouling and clogging with fines, the design rate shall be 50% of the field determined infiltration rate. This rate shall be used in designing the infiltration BMP.
[iv] 
Due to the potential safety hazards which are posed by the excavation of a P.I.T., adequate safety measures shall be taken including those required by OSHA to permit safe access to the excavation areas during the test procedure as well as the use of warning signs or a fence to limit access to the basin by the public during periods when the basin is left unattended, or both.
[v] 
The basin flooding test shall not be conducted in rock strata which have been blasted with explosives.
B. 
Wetland delineation report.
(1) 
For regulated activities requiring Major SWM Permits, a wetland delineation report shall be required. National Wetlands Inventory searches or other similar database queries are not valid methods for determining the presence of wetlands. Wetland delineation shall be conducted in accordance with Chapter 178, Subdivision and Land Development.
(2) 
For regulated activities requiring Minor SWM Permits, other information — such as the National Wetlands Inventory or soil survey data displaying no hydric soils are present on the project site — showing that no wetland impacts are expected shall be required as part of the SWM Report.
C. 
Carbonate assessment report.
(1) 
For all regulated activities proposing SWM Facilities or BMPs within or near carbonate geology or karst features, a carbonate assessment report shall be provided.
(2) 
A carbonate assessment report shall be evaluated by a licensed professional Civil Engineer with expertise in geotechnical engineering or a licensed professional Geologist. Each of said experts will be licensed in their field of expertise by the Commonwealth of Pennsylvania. The Township reserves the right to reject any report that in its opinion was authored by an individual or firm which does not possess the background to properly assess the site conditions as they relate to this chapter. The carbonate assessment report shall be signed and/or sealed by the licensed professional.
(3) 
The format and content of the carbonate assessment report shall include but not be limited to the following:
(a) 
A statement of purpose section that indicates the standards being addressed in the report and whether the applicant is attempting to demonstrate compliance or justify noncompliance with those specific standards.
(b) 
A description of existing conditions that describes the existing characteristics of the property with respect to geology, topography, ground and surface water hydrology, soils, vegetation, and existing improvements and uses of property.
(c) 
A map at a scale no smaller than one inch equals 100 feet and a contour interval of one to two feet indicating the location of the property and all proposed improvements.
(d) 
The developer/applicant shall submit information for the affected properties indicating the presence of any of the following carbonate features: depressions, fissures, lineaments, faults, ghost lakes, bedrock, outcrops, sinkholes, seasonal high-water levels, soil mottling, springs, surface drainage entering the ground, disappearing lakes or stream, and caverns.
(e) 
The professional shall prepare a map of the site showing all karst features or feature indicators. The mapping shall indicate, but shall not be limited to, the following features: closed depressions, open sinkholes, seasonal high-water table indicators, outcrops of bedrock, unplowed areas in plowed fields, surface drainage into ground, and ghost lakes after rainfall.
(f) 
A recommended plan for the repair or remediation of surface or subsurface features that may impact the proposed development as well as the adjacent improved or unimproved properties. Additionally, a plan to address potential adverse environmental impacts on groundwater quality and stormwater management resulting from the development.
(g) 
The information requested above shall be based upon previously published data and field surveys which may include test boring, excavation of test pits, air-track probes, and geophysical methods.
(4) 
If the applicant can provide evidence that the site is not underlain by carbonate geology or karst features, then a carbonate assessment report shall not be required.
A. 
Copies of the SWM Site Plan and Report ("Submission") shall be submitted to the following agencies:
(1) 
One digital copy to the Township.
(2) 
As required by the Bucks County Conservation District.
(3) 
One digital copy and one physical copy to the Township Engineer.
B. 
The Submission shall also include the following components:
(1) 
SWM Permit application with applicable review fees.
(2) 
SWM Site Plan Checklist.
(3) 
Operation and Maintenance (O&M) Plan and Agreement in accordance with Article V of this chapter.
(4) 
For land development, financial security and guarantee for all improvements in accordance with the standards of Chapter 178, Subdivision and Land Development.
(5) 
As applicable, waiver requests in compliance with § 173-10 of this chapter.
(6) 
For land development, subsurface investigation results.
(7) 
As applicable, infiltration testing results.
(8) 
As applicable, wetland delineation report.
(9) 
As applicable, Stormwater Pollution and Prevention Plan.
(10) 
As applicable, any permit or authorization copies related to stormwater management, erosion and sediment control, waterways and wetlands, or other relevant plan clearances other than those required by the Township, including but not limited to county conservation district adequacy letters, NPDES permits, PADEP/ACOE water obstruction and encroachments permits, FEMA CLOMR/LOMRs, PNDI clearances, PennDOT HOP approvals when the proposed project encroaches into or impact a PennDOT right-of-way, and other appropriate permits as determined by the Township.
Submission Summary Table
Submission Items
Minor SWM Permit
Major SWM Permit
Major SWM Permit (5k)*
SWM Permit Application & Fees
✓
✓
✓
SWM Site Plan Checklist
✓
✓
✓
SWM Site Plan
✓
✓
✓
SWM Report (20% I=M)
✓
✓
SWM Report (100% I=M)
O&M Agreement and Plan
✓
✓
✓
Financial Security
LD
LD
LD
Waiver Requests
AA
AA
AA
Subsurface Investigation
LD
LD
LD
Infiltration Testing
✓
✓
Infiltration Soils Data
✓
Wetland Delineation Report
✓
✓
Carbonate Assessment Report
AA
AA
AA
Wetland Data
✓
SWPP
AA
AA
AA
External Permitting
AA
AA
AA
NOTES:
*
Major SWM Permits with 5,000 SF of existing impervious area per Article II.
✓= Required/AA = As Applicable/LD = Land Development/"l=M" = "Existing Impervious = Meadow"
C. 
Any submissions that are found to be incomplete shall not be accepted for review and shall be returned to the applicant with a notification in writing of the specific manner in which the submission is incomplete.
D. 
Additional physical copies of the Submission shall be submitted as requested by the Township or other reviewing agency, or as required by Chapter 178, Subdivision and Land Development, if applicable.
A. 
The Submission shall be reviewed by the Township and the Township Engineer, on behalf of the Township, for consistency with the provisions of this chapter.
B. 
The Township shall notify the applicant in writing within 45 days whether the Submission is approved or disapproved. If the Submission involves a Subdivision and/or Land Development Plan, the notification shall occur within the time period allowed by the Municipalities Planning Code,[1] and it shall further be coincident with any extensions, approvals, or other schedule changes with the Subdivision and/or Land Development Plan.
[1]
Editor's Note: See 53 P.S. § 10101 et seq.
C. 
For any SWM Site Plan that proposes to use any SWM Facilities or BMPs other than green infrastructure and LID practices to achieve the volume and rate controls required under this chapter, the Township will not approve the SWM Site Plan unless it determines that green infrastructure and LID practices are not acceptable.
D. 
The Township shall not approve any SWM Site Plan that is deficient in meeting the requirements of this chapter or has not received all other permits/authorizations. At its sole discretion, when a Submission is found to be deficient, the Township may either disapprove the SWM Site Plan and require a resubmission per § 173-30 below, or, in the case of minor deficiencies, the Township may accept submission of modifications per § 173-29 below.
E. 
If the Township disapproves the SWM Site Plan, the Township will state the reasons for the disapproval in writing. The Township may also approve the SWM Site Plan with conditions and, if so, shall provide the acceptable conditions for approval in writing.
F. 
If the Township approves the SWM Site Plan, or all the conditions of an approval per § 173-28D above are met, the Township shall promptly issue a SWM Permit to the applicant.
A modification to a Submission with minor deficiencies shall require a resubmission of the modified SWM Site Plan and Report in full in accordance with this article. If modifications require updates to other components of the Submission as determined by the Township, including but not limited to the O&M Agreement and Plan or further waiver requests, said components shall also be submitted. Any modifications shall renew the 45-day notification timeline as listed in § 173-28B above.
A disapproved SWM Site Plan may be resubmitted to the Township, with the revisions addressing the Township's concerns, in accordance with this article. A resubmitted SWM Site Plan shall include all other Submission components in full, including applicable review fees.
A. 
A request for modification to a SWM Site Plan that has already been approved shall be in writing. The written request shall provide specific details on what portions of the SWM Site Plan are being proposed for modification, and shall be accompanied by Submission components showing the proposed modifications as required by the Township. Any modifications within the updated Submission not matching the written request are considered void.
B. 
Requests for modification shall follow the Submission review process per § 173-28 above, including the payment of applicable fees. Modifications may not significantly alter SWM Facilities or calculation methodologies and techniques. "Significant modification" of a SWM Facility for the purpose of this section includes, but is not limited to, a change of type, size, and location of a SWM Facility. Modifications may not alter stormwater management facilities in a manner which significantly affects the discharge of stormwater to an adjacent property. Requests for modifications as described in this paragraph shall be treated as a new Submission in accordance with this article.
C. 
The Township reserves the sole right to deny requests for modification and require new Submission in accordance with this article upon review of the extent of the requested modifications.
The Township's approval of a SWM Site Plan and issuance of a SWM Permit authorizes the regulated activities contained in the SWM Site Plan for a maximum term of validity of five years following the date of approval. The Township may specify a term of validity shorter than five years in the approval for any specific SWM Site Plan. Terms of validity shall commence on the date the Township issues the SWM Permit. If an approved SWM Site Plan is not completed according to § 173-33 within the term of validity, then the Township may consider the SWM Site Plan disapproved and may revoke any and all permits without the necessity of any proceedings for revocation. SWM Site Plans that are considered disapproved by the Township shall be resubmitted in accordance with § 173-30 of this chapter.
A. 
After completing the improvements listed in the SWM Site Plan, confirming the site has achieved permanent stabilization, and removing or retrofitting any ESC Facilities, the applicant shall notify the Township in writing that the work is complete.
B. 
In the case of Minor SWM Permits:
(1) 
After receipt of the written notification of completion, the Township shall conduct a final inspection for the purposes of determining the extent of project completion, confirming compliance with the approved SWM Site Plan, and the amount of release of financial security.
(2) 
If any deficiencies are noted by the Township, they shall be delivered to the Applicant in writing.
(3) 
Upon the correction of any deficiencies and determination of final completion, the Township shall notify the applicant of said determination in writing and release to the Applicant any remaining financial security.
C. 
In the case of Major SWM Permits:
(1) 
The Applicant shall submit an As-Built Plan for review with the written notification of completion. The As-Built Plan shall include the following items:
(a) 
Depiction of all items required in the original SWM Site Plan per § 173-24, including but not limited to profiles and construction details of improvements.
(b) 
Clear identification of all discrepancies alongside their original design criteria, dimensions, specifications, etc.
(c) 
A narrative explanation of any discrepancies with the approved SWM Site Plan.
(d) 
Latitude and longitude coordinates at the central location of all permanent SWM BMPs.
(e) 
A note stating, "(Qualified professional responsible for as-built plan composition), on this date, (signature date), certifies that all SWM and Conveyance Facilities and BMPs have been constructed according to the approved plans and specifications." A seal and dated signature shall accompany this statement.
(f) 
A note stating, "(Qualified professional responsible for as-built plan composition), on this date, (signature date), certifies that all survey, plan, and general data displayed herein are correct and true." A seal and dated signature shall accompany this statement.
(2) 
The Applicant shall submit an As-Built SWM Report for review with the written notification of completion. The As-Built SWM Report shall include the following items:
(a) 
Inclusion of all items required in the original SWM Report per § 173-25, including but not limited to stormwater runoff design computations and design documentation.
(b) 
Clear identification of all discrepancies alongside their original design criteria, calculations, documentation, etc.
(c) 
A narrative explanation of any discrepancies with the approved SWM Report.
(d) 
Post-construction infiltration testing.
[1] 
Double-ring infiltrometer tests shall be conducted in accordance with § 173-26A(5) at the bottom of all surface infiltration BMPs at a rate of one test per 5,000 square feet or fraction thereof of infiltrative surface with a minimum of one test for up to 400 square feet, and two tests for infiltrative surfaces of 400 square feet and greater. Tests for linear infiltration BMPs shall be conducted at a rate of one test per 100 feet or fraction thereof; minimum two tests.
[2] 
Double-ring infiltrometer tests shall be conducted in accordance with § 173-26A(5) at the bottom of all sub-surface infiltration BMPs, either during or after construction, at the rate identified in § 173-33C(2)(d)[1].
[3] 
All calculations that utilized a design infiltration rate within the approved SWM Report shall be corrected during the As-Built SWM Report submission to utilize the post-construction infiltration testing results.
[4] 
Alternative methods of confirming infiltration capacity (i.e., simulated runoff test or inspection during and after a large storm event) may be accepted on a case-by-case basis at the sole discretion of the Township Engineer.
(e) 
If the As-Built SWM Report identifies the As-Built SWM Facilities are deficient and do not meet the requirements of this chapter, remedial actions will be required to be performed by the applicant to ensure compliance.
(3) 
After receipt of the written notification of completion and As-Built Plan and Report, the Township shall: 1) conduct a final inspection for the purposes of determining the extent of project completion and the amount of release of financial security; and 2) review the As-Built Plan for acceptability and accuracy.
(4) 
If any deficiencies with either the work or the As-Built Plan and Report are noted by the Township, they shall be delivered to the Applicant in writing.
(5) 
After the correction of any deficiencies and determination of final completion, the Township shall notify the applicant of said determination in writing.
(6) 
After receipt of the written notification of determination of final completion, the Applicant shall record the As-Built Plan and Report in full within 90 days of receipt of said determination. Evidence of recording and a copy of the recorded As-Built Plan shall be provided by the Applicant to the Township.
(7) 
After receipt of the evidence of recording of the As-Built Plan and Report and a copy of the recorded As-Built Plan and Report itself, the Township shall release to the Applicant any remaining financial security. Occupancy and/or the release of financial security are prohibited until receipt of a copy of the recorded As-Built Plan and Report is received, and a note per § 173-24DD(14) shall be provided on the plan stating such.
D. 
If the SWM Site Plan was submitted as part of a Subdivision and Land Development Plan, project closeout shall follow the process and requirements in Chapter 178, Subdivision and Land Development. The entirety of the SWM Site Plan and Report including but not limited to grading plan, profiles, details, and calculations shall be recorded with the Subdivision and Land Development Plan.
(1) 
For Major SWM Permits, an As-Built Plan and Report as required above shall still be required or incorporated with the Subdivision and Land Development Plan's closeout process, and shall be recorded in full or incorporated in full with the Subdivision and Land Development As-Built Plan.