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. In instances where the municipality
lacks subdivision and land development regulations, the content of
SWM site plans shall follow the Allegheny County Subdivision and Land
Development Ordinance. 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 Part, 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:
1. 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
3I below.
2. The following signature block
for the municipality:
"(Municipal official or Designated Plan Reviewer (§ 19-403.1)),
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), 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."
3. The SWM site plan shall provide
the following information:
A. The overall stormwater management
concept for the project.
B. A determination of site conditions in accordance with the BMP Manual. (NOTE: See §
19-901, Subsection
3.) A detailed site evaluation shall be completed for projects proposed in environmentally sensitive areas, such as brownfields.
C. 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 §
19-301.
D. Expected project time schedule.
E. A soil erosion and sediment
control plan, where applicable, as prepared for and submitted to the
approval authority.
F. 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.
G. Plan and profile drawings of
all SWM BMPs, including drainage structures, pipes, open channels,
and swales.
H. SWM site plan shall show 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.
I. 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.
J. 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.
Up to five copies of the SWM site plan shall be submitted as
follows:
1. Two copies to the municipality.
2. One copy to the Municipal Engineer
(when applicable).
3. One copy to the Allegheny County
Conservation District (when requested by the District).
4. One copy to the Allegheny County
Sanitary Authority (in areas with combined sewer systems).
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 Designated Plan Reviewer, shall require a resubmission of the
modified SWM site plan in accordance with this Part.
A disapproved SWM site plan may be resubmitted, with the revisions addressing the municipality's concerns, to the municipality in accordance with this Part. The applicable review fee, in accord with Part
6, must accompany a resubmission of a disapproved SWM site plan.
The municipality'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 municipality 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 municipality signs the approval for an SWM site plan. If an approved SWM site plan is not completed according to §
19-407 within the term of validity, then the municipality may consider the SWM site plan disapproved and may revoke any and all permits. SWM site plans that are considered disapproved by the municipality shall be resubmitted in accordance with §
19-405 of this chapter.