For any activities regulated by this chapter and not eligible
for the exemptions provided herein, the final approval of subdivision
and/or land development plans, the issuance of any building or occupancy
permit, or the commencement of any land disturbance activity may not
proceed until the applicant has received written approval of a SWM
site plan from the City.
The SWM site plan and SWM report shall consist of all applicable
calculations, maps and plans. All SWM site plan materials shall be
submitted to the City in a format that is clear, concise, legible,
neat and well organized; otherwise, the SWM site plan shall be rejected.
All other applicable local and county ordinances shall be followed
in preparing the SWM site plan.
A. SWM site plan shall include, but not be limited to:
(1) Plans shall be of one size and in a form that meets the requirements
for recording in the Office of the Recorder of Deeds of Westmoreland
County.
(a)
Plans for tracts of less than 20 acres shall be drawn at a scale
of one inch equals no more than 50 feet;
(b)
Plans for tracts of 20 acres or more shall be drawn at a scale
of one inch equals no more than 100 feet;
(c)
Lettering shall be drawn to a size to be legible if the plans
are reduced to half size.
(2) The name of the development; name and location address of the property
site; name, address and telephone number of the applicant/owner of
the property; and name, address, telephone number, email address,
and engineering seal of the individual preparing the SWM site plan.
(3) The date of submission and dates of all revisions.
(4) A graphical and written scale on all drawings and maps.
(5) A North arrow on all drawings and maps.
(6) A location map at a minimum scale of one inch equals 2,000 feet that
illustrates the project location relative to highways, municipalities
or other identifiable landmarks.
(7) Metes and bounds description of the entire tract perimeter.
(8) Existing and final contours at intervals:
(a)
Slopes less than 5%: no greater than one foot.
(b)
Slopes between five and 15%: no greater than two feet.
(c)
Steep slopes (greater than 15%): five-foot contour intervals
may be used.
(9) Perimeters of existing water bodies within the project area, including
stream banks, lakes, ponds, springs, field-delineated wetlands or
other bodies of water, sinkholes, flood hazard boundaries (FEMA-delineated
floodplains and floodways), areas of natural vegetation to be preserved,
the total extent of the upstream area draining through the site, and
overland drainage paths. In addition, any areas necessary to determine
downstream impacts, where required for proposed stormwater management
facilities, must be shown.
(10)
The location of all existing and proposed utilities, on-lot
wastewater facilities, water supply wells, sanitary sewers, and water
lines on and within 50 feet of the property lines, including inlets,
manholes, valves, meters, poles, chambers, junction boxes, and other
utility system components.
(11)
A key map showing all existing man-made features beyond the
property boundary that may be affected by the project.
(12)
Soil names and boundaries with identification of the hydraulic
soil group classification, including rock outcroppings.
(13)
Proposed impervious surfaces (structures, roads, paved areas
and buildings), including plans and profiles of roads and paved areas
and floor elevations of buildings.
(14)
Existing and proposed land use(s).
(15)
Horizontal alignment, vertical profiles, and cross sections
of all open channels, pipes, swales and other BMPs where required
by the City Engineer.
(16)
The location and clear identification of the nature of permanent
stormwater BMPs.
(17)
The location of all erosion and sedimentation control facilities,
shown on a separate drawing from the SWM site plan (typically an E&S
plan).
(18)
A minimum twenty-foot wide access easement around all stormwater
management facilities or facilities to be considered that would provide
ingress to and egress from a public right-of-way.
(19)
Construction details for all drainage and stormwater BMPs.
(21)
Identification of short-term and long-term ownership, operations
and maintenance responsibilities.
(22)
Notes and statements:
(a)
A statement, signed by the landowner, acknowledging that the
stormwater BMPs are fixtures that cannot be altered or removed without
prior approval from the municipality.
(b)
A statement referencing the operation and maintenance (O&M)
agreement and stating that the O&M agreement is part of the SWM
site plan.
(c)
At the discretion of the City Engineer, a note indicating that
record drawings will be provided for all stormwater facilities prior
to occupancy, or release of the surety bond.
(d)
The following signature block for the registered professional
preparing the stormwater management plan:
I, __________, hereby certify that the stormwater management
plan meets all design standards and criteria of the City of Lower
Burrell Stormwater Management Ordinance.
(e)
The following signature block for the Municipal Engineer reviewing
the stormwater management plan:
I, __________, have reviewed this stormwater management plan
in accordance with the design standards and criteria of the City of
Lower Burrell Stormwater Management Ordinance.
B. SWM report shall include, but not be limited to:
(1) General date, including:
(b)
Project location and address of the property site (if available).
(c)
Name, address and telephone number of the applicant/owner of
the property.
(d)
Name, address, telephone number, email address and engineering
seal of the individual preparing the SWM report.
(e)
Date of submission and any revisions.
(2) Project description narrative that clearly discusses the project
and provides the following information, where applicable:
(a)
Narrative:
[1]
Statement of the regulated activity describing what is being
proposed. Overall stormwater management concept with description of
permanent techniques, including construction specifications and materials
to be used for stormwater management facilities.
[2]
Expected project schedule.
[3]
Location map showing the project site and its location relative
to its overall surroundings.
[4]
Detailed description of the existing site conditions, including
a site evaluation completed for projects proposed in areas of carbonate
geology or karst topography, and other environmentally sensitive areas
such as brownfields.
[5]
A watershed map of the total site area, pre- and post-, which
must be equal or have an explanation as to why they are not. This
map must also show the time of concentration that is representative
of site conditions for pre- and post-development areas.
[6]
Total site impervious area.
[8]
Number and description of stormwater management facilities.
[11] Whether the site is located in a high-quality
or exceptional-value watershed.
[12] The Chapter 93 stream classification of any watercourses
present on site.
[13] Types of water quality and recharge systems used,
if applicable.
[14] Complete hydrologic, hydraulic and structural
computations for all stormwater management facilities.
[15] A written maintenance plan for all stormwater
features, including detention facilities and other stormwater management
facilities.
[16] Other pertinent information as required.
(b)
Summary tables:
[1]
Predevelopment/existing conditions:
[a] Hydrologic soil group (HSG) assumptions.
[d] Runoff volume and peak rate of runoff for each
storm interval.
[2]
Post-development/proposed conditions:
[a] Hydrologic soil group (HSG) assumptions.
[d] Runoff volume and peak rate of runoff for each
storm interval.
[3]
Detention facility (pond) routing analysis:
[a] Undetained areas that drain to the proposed stormwater
facilities.
[b] Runoff volume and peak rate as released from the
proposed detention facility for each storm interval.
[4]
Detention facility (pond):
[a] Maximum water surface elevation for each storm
interval.
[c] Emergency spillway elevation.
[d] Outlet structure: orifice and weir size and elevation.
[5]
Water quality volume and depth requirements (where applicable).
(c)
Calculations:
[1]
Complete hydrologic, hydraulic and structural computations,
calculations, assumptions, and criteria for the design of all stormwater
BMPs.
[2]
Details of the berm embankment and outlet structure indicating
the embankment top elevation, embankment side slopes, the width of
all embankments, emergency spillway elevation, outlet structure dimensions,
discharge barrel dimensions and slope as well as spacing of anti-seep
collars.
[3]
Design computations for the control structure (discharge barrel
and outlet structure, etc.).
[4]
A plot or table of the stage-storage (volume vs. elevation)
and all supporting computations.
(d)
Drawings:
[1]
Drainage area maps for all watersheds and inlets depicting the
time of concentration path for both existing conditions and post-development
conditions.
[2]
All stormwater management facilities must be located on a plan
and described in detail, including easements and buffer boundaries.
(3) Reports that do not clearly contain the above information may be
rejected for review by the municipality and will be returned to the
applicant.
(4) Description of, justification, and actual field results for infiltration
testing with respect to the type of test and test location for the
design of infiltration BMPs.
(5) 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 municipal stormwater collection system that may receive
runoff from the project site.
(6) Description of the proposed changes to the land surface and vegetative
cover, including the type and amount of impervious area to be added.
(7) Identification of short-term and long-term ownership, operation and
maintenance responsibilities, as well as schedules and costs for inspection
and maintenance activities for each permanent stormwater or drainage
BMP, including provisions for permanent access and maintenance easements.
C. Supplemental information to be provided prior to final approval of
the SWM site plan, as requested by the City:
(1) Signed and executed operations and maintenance agreement (Appendix
A).
(2) Signed and executed easements, as required for all on-site and off-site
work.
(3) An erosion and sedimentation control plan.
(4) Approval letter from the Westmoreland County Conservation District
for those projects which require an NPDES permit.
(5) Applicable permits from the Pennsylvania Department of Environmental
Protection (PA DEP) and Army Corps of Engineers (ACOE), for those
projects which require permits from the PA DEP and/or the ACOE.
(6) Soils investigation report, including boring logs, compaction requirements,
and recommendation for construction of detention basins.
(7) A highway occupancy permit from the Pennsylvania Department of Transportation
(PennDOT) when utilization of a PennDOT storm drainage system is proposed
or when the proposed development would encroach onto a PennDOT right-of-way.
(8) Cost estimate of the proposed improvements.
D. 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 an 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.
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 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.
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 §
252-31 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 §
252-28 of this chapter.