The Borough shall require receipt of a complete plan, as specified
in this chapter. Six copies of the stormwater management plan shall
be submitted and distributed as follows:
A. Two copies to the Borough accompanied by the requisite Borough review fee and financial guarantee as established by §
190-26C.
B. One copy to the Municipal Engineer.
C. One copy to the Allegheny County Conservation District (when requested
by the District).
Appropriate sections from the municipality's Subdivision
and Land Development Ordinance, and other applicable local ordinances, shall be followed
in preparing the SWM site plans. The municipality shall not approve
any SWM site plan that is deficient in meeting the requirements of
this chapter. At its sole discretion and in accordance with this article,
when a SWM site plan is found to be deficient, the municipality may
either disapprove the submission and require a resubmission, or in
the case of minor deficiencies, the municipality may accept submission
of modifications. The following items shall be included in the SWM
site plan:
A. 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 Subsection
C(11) below.
B. The following signature block for the municipality:
"[Municipal official or designated plan reviewer (Section 403.A)], 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. _____, except where waivers have been
granted as noted on the plan. The review is based on a survey and
plan prepared by others and assumes that all information is correct
and valid as submitted."
C. The SWM site plan shall provide the following information:
(1) The overall stormwater management concept for the project.
(2) A determination of site conditions in accordance with the BMP Manual.
A detailed site evaluation shall be completed for projects proposed
in environmentally sensitive areas, such as brownfields.
(3) A key map showing the development site's location within the
municipality's stormwater management districts, watersheds and
subareas. On all site drawings, show the boundaries of the district(s),
watershed(s) and subarea(s) as they are located on the development
site and identify their district and watershed names and applicable
subarea numbers.
(4) Location of the one-hundred-year floodplain on the development site
based on the current municipal Flood Insurance Rate Maps.
(5) Stormwater runoff design computations and documentation as specified
in this chapter, or as otherwise necessary to demonstrate that the
maximum practicable measures have been taken to meet the requirements
of this chapter, including the recommendations and general requirements
in Section 301.
(6) Expected project time schedule.
(7) A soil erosion and sediment control plan, where applicable, as prepared
for and submitted to the approval authority.
(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.
(9) Plan and profile drawings and details of all SWM BMPs, including
drainage structures, pipes, open channels, and swales.
(10)
SWM site plans shall show the property lines, dimensions of
the site and the locations of existing and proposed on-lot wastewater
facilities and water supply wells, property boundaries, existing and
proposed topography, point(s) of interest, utilities, and potential
utility conflicts.
(11)
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
including type and schedule/frequency of maintenance activities, personnel
and equipment requirements, estimated annual maintenance costs, and
method of financing continuing O&M.
(12)
A justification, acceptable to the designated plan reviewer,
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.
(13)
Certification and seal of the qualified professional responsible
for the preparation of the plans and report.
(14)
Watershed maps delineating predevelopment and post-development
watershed boundaries and land cover conditions, as well as the flow
path and segments used to determine time of concentrations for each
watershed.
(15)
Storm sewer calculations and watershed maps delineating all
subareas used to size and compute flow for storm sewer system.
(16)
Existing contours at intervals of two feet except in areas with
slopes greater than 15%, in which case five-foot contour intervals
may be used.
(17)
Contours of the finished project site at intervals of two feet,
except in areas with slopes greater than 15%, in which case, five-foot
contour intervals may be used.
A disapproved stormwater management plan may be resubmitted with the revisions addressing the Municipal Engineer's concerns documented in writing, and addressed to the Municipal Secretary in accordance with Article
VI of this chapter and distributed accordingly and shall be subject to review as specified in Article
VI of this chapter. Any applicable municipal review and inspection fee must accompany a resubmission of a disapproved stormwater management plan.