For any of the activities regulated by this
part, the preliminary or final approval of subdivision and/or land
development plans, the issuance of any building or occupancy permit,
or the commencement of any earth disturbance activity may not proceed
until the property owner or applicant or his/her agent has received
written approval of a drainage plan from the Township, obtained an
NPDES permit for stormwater discharges associated with construction
activities, if greater than one acre of land disturbance, from the
local conservation district and/or DEP, and an adequate erosion and
sediment control plan review by the conservation district.
The drainage plan shall consist of a general description of the project, including sequencing items described in §
203-52, 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 Township 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 §
203-52B.
(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.
(5) A general description of proposed nonpoint-source
pollution controls.
(6) The grading permit plan application and completed
fee schedule form and associated fee (Appendix C).
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 office
of the Recorder of Deeds of Montgomery County. If the SALDO has more
stringent criteria than this part, 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,
Township boundaries, or other identifiable landmarks.
(2) Existing contours at intervals of two feet. Existing
contours shall be represented by dashed lines.
(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 drainagecourses, 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 waterlines 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.
(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 around 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 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 part.
(22)
A statement, signed by the applicant, acknowledging
that any revision to the approved post-construction stormwater management
plan must be approved by the Township 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.
(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 design
standards and criteria of the Lower Pottsgrove Township Swamp Creek
Watershed Stormwater Management Ordinance."
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C. Supplemental information to be submitted to the Township.
(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 §
203-52.
(b)
Stormwater runoff computations as specified
in this part.
(c)
Stormwater management techniques to be applied
both during and after development.
(d)
Expected project time schedule.
(e)
Development stages or project phases, if applicable.
(f)
An operations and maintenance plan in accordance with §
203-63 of this part.
(2) An erosion and sediment control plan.
(3) A description of the effect of the project's runoff
volumes and peak flows on adjacent properties and on any existing
Township 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 post-construction stormwater management (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 detail sheets, and landscaping
or conservation plans.
(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. Minimum setback
distances shall 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 Township shall require receipt of a complete
drainage plan, as specified in this part.
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.
(4) Chapter 105 (Dam Safety and Waterway Management).
(5) Chapter 106 (Floodplain 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 Township 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. For regulated activities that do not require SALDO approval, see §
203-43, General requirements.
E. Six copies of the drainage plan shall be submitted
and distributed as follows:
(1) Two copies to the Township accompanied by the requisite
Township review fee, as specified in this part.
(2) Two copies to the Montgomery County Conservation District.
(3) One copy to the Township Engineer.
(4) One copy to the Montgomery County Planning Commission.
F. 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.
An inconsistent or noncompliant drainage plan may be resubmitted with the revisions addressing the Township Engineer's concerns documented in writing. It must be addressed to the Township Secretary in accordance with §
203-45 of this part, distributed accordingly, and be subject to review as specified in §
203-46 of this part. The applicable Township review and inspection fee must accompany a resubmission of an inconsistent or noncompliant drainage plan.