For any of the activities regulated by this chapter and not eligible for the exemptions provided in § 183-12, 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 municipality.
The SWM site plan and SWM site report shall consist of all applicable calculations, maps and plans. All SWM site plan materials shall be submitted to the municipality in a format that is clear, concise, legible, neat and well organized; otherwise, the SWM site plan shall be rejected. Appropriate sections from Chapter 190, Subdivision and Land Development, and other applicable local ordinances, shall be followed in preparing the SWM site plan.
A.
An 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 Clarion 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, plans shall be drawn at
a scale of one inch equals no more than 100 feet.
(c)
All 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, e-mail 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 and
illustrates the project relative to highways, municipalities or other
identifiable landmarks.
(7)
Metes and bounds description of the entire tract perimeter.
(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 drainagepaths. 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 waterlines
on and within 50 feet of 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.
(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 plan from the SWM site plan (typically an E&S
plan).
(18)
A minimum twenty-foot-wide access easement around all stormwater
management facilities that would provide ingress to and egress from
a public right-of-way. In lieu of providing an easement to the public
right-of-way, a note may be added to the plan granting the municipality
or its designees access to all easements via the nearest public right-of-way.
(19)
Construction details for all drainage and stormwater BMPs.
(20)
Construction sequence.
(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 by 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)
A note indicating that record drawings will be provided for
all stormwater facilities prior to occupancy or the release of the
surety bond.
(d)
The following signature block for the individual preparing the
stormwater management plan:
|
"I,__________, hereby certify that the Stormwater Management
Plan meets all design standards and criteria of the Clarion Borough's
Stormwater Management Ordinance."
|
(e)
The following signature block for the municipal reviewer of
the stormwater management plan:
|
"I,__________, have reviewed this Stormwater Management Plan
in accordance with the design standards and criteria of the Clarion
Borough's Stormwater Management Ordinance."
|
B.
SWM site report shall include (but not limited to):
(1)
General data, including:
(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 stormwater management 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 release rate districts.
[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]
Total site area – pre and post, which must be equal or
have an explanation as to why it is not.
[6]
Total site impervious area.
[7]
Total off-site areas.
[8]
Number and description of stormwater management facilities.
[9]
Type of development.
[10]
Predevelopment land use.
[11]
Whether site is a water quality sensitive (WQS) development.
[12]
Whether site is in a defined sensitive area.
[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 elements.
[16]
Identification of ownership and maintenance responsibility for
all permanent stormwater management facilities.
[17]
Other pertinent information, as required.
(b)
Summary tables.
[1]
Existing conditions runoff volume and peak rate of runoff.
[2]
Post-development runoff volume and peak rate of runoff.
[3]
Undetained areas, areas to ponds.
[4]
Land use for each subarea.
[5]
Hydrologic soil group (HSG) assumptions, curve numbers (CN).
[6]
Post-development peak rate of runoff routed to ponds and out.
[7]
Pond maximum return period design data, including maximum water
surface elevation, berm elevation, and emergency spillway elevation.
[8]
Water depth and volume requirements.
(c)
Calculations.
[1]
Complete 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, top width of
embankment, emergency spillway elevation, perforated riser dimensions,
pipe barrel dimensions and dimensions and spacing of antiseep collars.
[3]
Design computations for the control structures (pipe barrel
and riser, etc.).
[4]
A plot or table of the stage-storage (volume vs. elevation)
and all supporting computations.
[5]
Routing computations.
(3)
Reports that do not clearly indicate the above information may be
rejected for review by the municipality and will be returned to the
applicant.
(4)
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.
(5)
Description of the proposed changes to the land surface and vegetative
cover, including the type and amount of impervious area to be added.
(6)
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 or maintenance easements.
C.
Supplemental information to be provided prior to recording of the
SWM site plan, as applicable:
(1)
Signed and executed Operations and Maintenance Agreement (Appendix
A).[1]
[1]
Editor's Note: Appendix A is attached to this chapter.
(2)
Signed and executed easements, as required for all on-site and off-site
work.
(3)
An erosion and sedimentation control plan and approval letter from
the Clarion County Conservation District.
(4)
A NPDES permit.
(5)
Permits from PADEP and ACOE.
(6)
Geologic assessment.
(7)
Soils investigation report, compaction requirements, and recommendations
for construction of detention basins.
(8)
A highway occupancy permit from PennDOT when utilization of a PennDOT
storm drainage system is proposed or when proposed facilities would
encroach onto a PennDOT right-of-way.
A.
The applicant shall submit the SWM site plan and report for the regulated
activity.
B.
Three copies of the SWM site plan and report shall be submitted to
the municipality accompanied by the requisite executed review fee
reimbursement agreement, as specified in this chapter.
C.
Additional copies shall be submitted as requested by the municipality.
A.
The municipality shall require receipt of a complete SWM site plan
and report as specified in this chapter. The municipality shall review
the SWM site plan and report for consistency with the purposes, requirements
and intent of this chapter.
B.
The municipality shall not approve any SWM site plan and report 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
and report is found to be deficient, the municipality may disapprove
the submission and require a resubmission or, in the case of minor
deficiencies, the municipality may accept submission of modifications.
C.
The municipality shall notify the applicant in writing within 45
calendar days whether the SWM site plan and report is approved or
disapproved if the SWM site plan and report is not part of a subdivision
or land development plan. If the SWM site plan and report involves
a subdivision or land development plan, the timing shall follow the
subdivision and land development process according to the Municipalities
Planning Code.[1]
[1]
Editor's Note: See 53 P.S. § 10101 et seq.
D.
The municipal building permit office shall not issue a building permit
for any regulated activity if the SWM site plan and report has been
found to be inconsistent with this chapter, as determined by the municipality.
A modification to a submitted SWM site plan and report for a
development site that involves a change in stormwater management facilities
or techniques, or that involves the relocation or redesign of stormwater
management facilities, 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 chapter.
A disapproved SWM site plan and report may be resubmitted, with
the revisions addressing the municipality's concerns documented
in writing, to the municipality in accordance with this chapter. The
applicable municipal review fee must accompany a resubmission of a
disapproved SWM site plan and report.
The municipality's approval of a SWM site plan and report
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 a SWM site plan. If stormwater management facilities
included in the approved SWM site plan have not been constructed,
or if a record drawing of these facilities has not been approved within
this time, then the municipality may consider the SWM site plan disapproved
and may revoke any and all permits or approvals.
A.
The applicant shall be responsible for providing record drawings
of all stormwater BMPs included in the approved SWM site plan. The
record drawings and an explanation of any discrepancies with the approved
SWM site plan shall be submitted to the municipality as a prerequisite
for the release of the guarantee or issuance of an occupancy permit.
B.
The record drawings shall include a certification of completion signed
by a qualified professional verifying that all permanent stormwater
BMPs have been constructed according to the approved SWM site plan
and report.
(1)
Drawings shall show all approved revisions and elevations and inverts
to all manholes, inlets, pipes and stormwater control facilities.
(2)
Submission shall include a comparison of the constructed stage-storage
(volume vs. elevation) of all aboveground and below-ground stormwater
storage facilities to the approved design.
C.
After receipt of the record drawings and certification of completion
by the municipality, the municipality may conduct a final inspection.
