For any of the activities regulated by this chapter, the preliminary
or final approval of subdivision and/or land development plans, the
issuance of any building or occupancy permit, the commencement of
any earth disturbance, or activity may not proceed until the property
owner or applicant or his/her agent has received written approval
of a SWM site plan from the municipality and an approval of an adequate
erosion and sediment (E&S) control plan from the municipality
or County Conservation District.
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 erosion and sediment
(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 the municipality
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.
(2) General description of proposed 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.
(5) A general description of proposed nonpoint source pollution controls.
(6) The SWM site plan application and completed fee schedule form and
associated fee.
(7) The SWM site plan checklist.
B. Maps. Prepare 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, vernal
pools, stream buffers, floodplains and hydrologic soil groups. Land
development, existing recharge areas, and any other requirements specifically
outlined in the municipal SALDO shall also be included. A 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 or less. In areas of slopes
greater than 10%, 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 and boundaries.
(7) Limits of earth disturbance, including the type and amount of impervious
area that is proposed.
(8) Proposed structures, roads, paved areas, and buildings.
(9) Final contours at intervals of two feet or less. In areas of steep
slopes (greater than 10%), 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.
(18)
Overland drainage patterns and swales.
(19)
A fifteen-foot-wide access easement around all stormwater management
facilities to provide ingress to and egress from a public right-of-way.
(20)
The location of all erosion and sediment control facilities.
(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 drainage plan must be approved by the municipality,
and that a revised erosion and sediment control plan must be submitted
to the municipality or Conservation District for approval.
(23)
The following signature block for the design engineer:
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"I, (Design Engineer), on this date (date of signature), hereby
certify that the drainage plan meets all requirements of the Department
of Environmental Protection's (DEP's) regulations and this chapter."
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C. Supplemental information to be submitted to the municipality.
(1) The following information shall be submitted by the applicant and
shall include:
(a)
The overall stormwater management concept for the project designed.
(b)
Stormwater runoff computations required by 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 (O&M) plan in accordance with §
290-31 of this chapter.
(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) An approved highway occupancy permit from the Pennsylvania Department
of Transportation (PennDOT) district office when drainage towards
PennDOT property is proposed.
D. Stormwater management facilities.
(1) All stormwater management facilities must be located on a plan and
described in detail.
(2) When infiltration measures such as seepage pits, beds, or trenches
are used, the locations of existing and proposed septic tank infiltration
areas and wells must be shown.
(3) All calculations, assumptions, and criteria used in the design of
the stormwater management facilities must be shown.
The municipality requires submission of a complete SWM site
plan, 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) National Pollutant Discharge Elimination System (NPDES) Permit for
Stormwater Discharges from Construction Activities.
(2) Any other permit under applicable state or federal regulations.
B. Six copies of the SWM site plan shall be submitted and distributed
as follows:
(1) Two copies to the municipality accompanied by the requisite municipal
review fee, as specified in this chapter.
(2) Two copies to the County Conservation District.
(3) One copy to the municipal engineer (where applicable).
(4) One copy to the County Planning Commission/Department.
C. 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.
D. Additional copies shall be submitted as requested by the municipality
or DEP.
A modification to a submitted SWM site plan that involves a
change in BMPs or techniques, or that involves the relocation or redesign
of BMPs, or that is necessary because soil or other conditions are
not as stated on the SWM site plan as determined by the municipality
shall require a resubmission of the modified SWM site plan in accordance
with this article.
A disapproved SWM site plan may be resubmitted, with the revisions
addressing the municipality's concerns, to the municipality in accordance
with this article. The applicable review fee must accompany a resubmission
of a disapproved SWM site plan.