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 Township
in a format that is clear, concise, legible, neat, and well organized;
otherwise, the Township may not accept the SWM site plan for review.
The following items shall be included in the SWM site plan:
(a)
General:
(1)
General description of the project.
(2)
All stormwater management facilities must be located on a plan
and detailed description of proposed stormwater management techniques,
including drainage and construction specifications of the materials
to be used for the stormwater management facilities.
(3)
Complete hydrologic, hydraulic, and structural computations
for all stormwater management facilities.
(4)
An erosion and sediment control plan. The applicant is required
to obtain a letter of approval or adequacy from the Montgomery County
Conservation District for the erosion and sediment control plan for
all projects that propose greater than one acre of earth disturbance.
(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:
(1)
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, hydrologic soil groups, closed topographic
depressions and recharge areas. Land development, existing recharge
areas, and any other requirements specifically outlined in the municipal
SALDO also shall be included.
(2)
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. Map(s) for a stormwater management plan filed as part of a
land development application shall meet the requirements for both
the SALDO and this chapter. The contents of the map(s) shall include,
but not be limited to:
A.
The location of the project relative to highways, municipal
boundaries, or other identifiable landmarks.
B.
Existing contours at intervals of two feet or less. In areas
of slopes greater than 10%, five-foot contour intervals may be used.
C.
Existing streams, lakes, ponds, or other waters of the commonwealth
within the project area.
D.
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.
E.
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 this section.
F.
The following signature block for the municipality: "(Municipal
official or designee), 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. (number assigned to ordinance)."
G.
A determination of site conditions in accordance with the BMP
Manual. 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.
H.
Plan and profile drawings of all SWM BMPs, including drainage
structures, pipes, open channels, and swales.
I.
SWM site plan shall show the locations of existing and proposed
on-lot wastewater facilities and water supply wells.
J.
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.
K.
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.
L.
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.
N.
The total tract boundary and size with distances marked to the
nearest foot and bearings to the nearest degree.
O.
Existing and proposed land use(s).
P.
A key map showing all existing man-made features beyond the
property boundary that would be affected by the project.
Q.
Location of all open channels.
R.
Overland drainage patterns and swales.
S.
A fifteen-foot-wide access easement around all stormwater management
facilities to provide ingress to and egress from a public right-of-way,
where necessary, or appropriate at discretion of the Township.
T.
The location of all erosion and sediment control facilities.
U.
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 located within
this Township.
V.
The following note shall be placed on all plans which propose
permanent BMPs: "The BMP facilities shown on these plans are a basic
and perpetual part of the stormwater management system for the proposed
site located in Lower Gwynedd Township, Montgomery County, and as
such are to be protected and preserved in accordance with the approved
plans by the owners, their successors and assigns of these lands.
Lower Gwynedd Township and/or its agents reserve the right and privilege
to enter upon these lands from time to time for the inspection of
said facilities in order to determine that the structural and design
integrity is being maintained and the proper operation and maintenance
of the facility is being conducted."
W.
A statement, signed by the applicant, acknowledging that any
revision to the approved drainage plan must be approved by the Township,
and that a revised erosion and sediment control plan must be submitted
to the Township and Montgomery County Conservation District for approval,
if applicable.
X.
The following signature block for the Design Engineer:
"I, (Design Engineer), on this date (date of signature); hereby
certify that this drainage plan meets all requirements of the Department
of Environmental Protection's (DEP's) regulations and this Ordinance."
(c)
Supplemental information to be submitted to the Township:
(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
all applicable sections of this chapter.
(2)
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.
(3)
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)
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.
(2)
All calculations, assumptions, and criteria used in the design
of the stormwater management facilities must be shown.
The Township 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)
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)
Three copies to the Township accompanied by the requisite Township
fees.
(2)
Two copies to the Montgomery County Conservation District, if
an NPDES submission is required.
(3)
The Township Engineer (where applicable).
(c)
When the SWM site plan is associated with a subdivision and/or
land development; the submission requirements of the Township Subdivision
and Land Development Ordinance shall be followed.
(d)
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.
(e)
Additional copies shall be submitted as requested by the Township,
Montgomery County Conservation District, or PADEP.
A modification to a submitted SWM site plan that involves a
change in SWM BMPs or techniques, or that involves the relocation
or redesign of SWM BMPs, or that is necessary because soil or other
conditions are not as stated on the SWM site plan as determined by
the Township shall require resubmission of the SWM site plan in accordance
with this article.
A disapproved SWM site plan may be resubmitted, with revisions
addressing the Township's concerns, to the Township in accordance
with this article. The applicable review fee must accompany a resubmission
of a disapproved SWM site plan.
The Township's approval of an SWM site plan 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 signs the approval for an SWM site plan. If an approved SWM site plan is not completed according to §
1241.501 within the term of validity, the Township may consider the SWM site plan disapproved and may revoke any and all permits. SWM site plans that are considered disapproved by the Township shall be resubmitted in accordance with §
1241.302.