Persons desiring a permit under this article shall file an application for drainage permit with the Township which shall be accompanied by drainage plan and associated stormwater management report, as applicable, to address stormwater management, and/or an erosion and sedimentation control plan to address earth disturbance activities. If the project is exempt from regulated activities for stormwater management but not exempt from regulated earth disturbance activities, then only the erosion and sediment control plan is required to be filed with the application. The drainage plan shall consist of a general description of the project, including sequencing items described in §
151-20, calculations, maps, and plans. A note on the maps shall refer to the associated computations and erosion and sediment control plan by title and date. The cover sheet of the computations, erosion and sediment control plan, and post-construction stormwater management (PCSWM) plan shall refer to the associated maps by title and date. All drainage plan materials shall be submitted to the municipality in a format that is clear, concise, legible, neat, and well organized; otherwise, the drainage plan shall not be accepted for review and shall be returned to the applicant. The following items shall be included in the drainage plan:
A. General.
(1) General description of the project, including those areas described in §
151-20B.
(2) General description of proposed permanent stormwater management techniques,
including construction specifications of the materials to be used
for stormwater management facilities.
(3) Complete hydrologic, hydraulic, and structural computations for all
stormwater management facilities.
(4) An erosion and sediment control plan, including all reviews and letters
of adequacy from the Conservation District, as applicable.
(5) A general description of proposed nonpoint source pollution controls.
(6) The drainage plan application (Appendix C-1). The Township reserves the right to revise the application from time to time to comply with the terms and conditions of this Chapter
151.
(7) The drainage plan checklist (Appendix C-2).
(8) The development or construction schedule.
B. Maps. Map(s) of the project area shall be submitted on twenty-four-inch
by thirty-six-inch sheets and/or shall be prepared in a form that
meets the requirements for recording at the offices of the Recorder
of Deeds of Montgomery County. If the SALDO has more stringent criteria
than this chapter, then the more stringent criteria shall apply. The
contents of the map(s) shall include, but not be limited to:
(1) The location of the project relative to highways, municipal boundaries,
or other identifiable landmarks.
(2) Existing contours at intervals of two feet. In areas of slopes greater
than 25%, five-foot contour intervals may be used.
(3) Existing streams, lakes, ponds, or other waters of the commonwealth
within the project area.
(4) Other physical features, including flood hazard boundaries, stream
buffers, existing drainage courses, areas of natural vegetation to
be preserved, and the total extent of the upstream area draining through
the site.
(5) The locations of all existing and proposed utilities, sanitary sewers,
and water lines within 50 feet of property lines.
(6) An overlay showing soil names, boundaries and limitations (in tabular
format).
(7) Limits of earth disturbance, including the type and amount of impervious
area that would be added.
(8) Proposed structures, roads, paved areas, and buildings.
(9) Final contours at intervals of two feet. In areas of steep slopes
(greater than 25%), five-foot contour intervals may be used.
(10)
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.
(12)
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.
(14)
The total tract boundary and size, with distances marked to
the nearest foot and bearings to the nearest degree.
(15)
Existing and proposed land use(s).
(16)
A key map showing all existing man-made features beyond the
property boundary that would be affected by the project.
(17)
Location of all open channels, as well as indicating where they
are draining after they leave the site (storm sewer, defined drainage
swale, stream channel, waters of the commonwealth, etc.).
(18)
Overland drainage patterns and swales.
(19)
A fifteen-foot-wide access easement to all stormwater management
facilities that would provide ingress to and egress from a public
right-of-way.
(20)
The location of all erosion and sediment control facilities,
both temporary and permanent, and all post-construction stormwater
management facilities, BMPs, systems, etc.
(21)
A note on the plan indicating the location and responsibility
for maintenance of stormwater management facilities that would be
located off site. All off-site facilities shall meet the performance
standards and design criteria specified in this chapter.
(22)
A statement, signed by the applicant, acknowledging that any
revision to the approved plan must be approved by the municipality
and the Conservation District and/or DEP (if greater than one acre
of land disturbance) and that a revised erosion and sediment control
plan must be submitted to the Conservation District for a determination
of adequacy, as applicable.
(23)
The following signature block for the design engineer: "I, (Design
Engineer), on this date (date of signature), hereby certify that the
drainage plan meets all design standards and criteria of the Limerick
Township Stormwater Management Ordinance."
C. Supplemental information to be submitted to the municipality.
(1) A written description of the following information shall be submitted
by the applicant and shall include:
(a)
The overall stormwater management concept for the project designed in accordance with §
151-20.
(b)
Stormwater runoff computations as specified in this chapter.
(c)
Stormwater management techniques to be applied both during and
after development.
(d)
Expected project time schedule.
(e)
Development stages or project phases, if so proposed.
(f)
An operations and maintenance plan in accordance with §
151-31 of this chapter.
(2) An erosion and sediment control plan.
(3) A description of the effect of the project (in terms of runoff volumes
and peak flows) on adjacent properties and on any existing municipal
stormwater collection system that may receive runoff from the project
site.
(4) A declaration of adequacy and highway occupancy permit from the Pennsylvania
Department of Transportation (PennDOT) district office when utilization
of a PennDOT storm drainage system is proposed.
D. Stormwater management facilities.
(1) All PCSWM BMP facilities must be located on a plan and described
in detail. The PCSWM plan package should include, at a minimum, pre-
and post-drainage area plans, an overall PCSWM plan, PCSWM details
sheets, landscaping or conservation plans, etc.
(2) When infiltration measures such as seepage pits, beds, or trenches
are used, the locations of existing and proposed septic tanks, infiltration
areas and wells must be shown. Minimum setback distances should be
identified from water supply wells, septic areas, and any adjacent
or downgradient buildings and/or structures with below-grade floors
or inhabitable space.
(3) All calculations, assumptions, and criteria used in the design of
the stormwater management facilities must be shown.
The municipality shall require receipt of a complete drainage
permit, as specified in this chapter.
A. Proof of application or documentation of required permit(s) or approvals
for the programs listed below shall be part of the plan:
(1) NPDES permit for stormwater discharges from construction activities.
(2) DEP joint permit application.
(3) PennDOT highway occupancy permit and/or Limerick Township road opening
permit, as applicable.
(4) 25 Pa. Code Chapter 105 (Dam Safety and Waterway Management).
(5) 25 Pa. Code Chapter
106 (Identified Floodplain Area Management).
(6) Any other permit under applicable state or federal regulations.
B. The plan shall be coordinated with the state and federal permit process
and the municipal SALDO review process.
C. For projects that require SALDO approval, the drainage plan shall
be submitted by the applicant as part of the preliminary plan submission
where applicable for the regulated activity.
D. Four copies of the drainage plan shall be submitted and distributed
as follows:
(1) Two copies to the municipality accompanied by the requisite municipal
review fee, application for drainage permit and associated stormwater
management report, as required, as specified in this chapter. The
Administrator shall forward one set to the Municipal Engineer for
review and retain one set at the Municipal offices.
(2) Two copies to the County Conservation District.
E. Any submissions to the agencies listed above 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.