A.
For any of the activities regulated by this chapter and not eligible for the exemptions provided in § 369-14, 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 an SWM site plan from the Township.
B.
The design of all stormwater management facilities shall incorporate
sound engineering principals and practices. The Township shall reserve
the right to disapprove any design that would result in the occurrence
or perpetuation of an adverse hydrologic or hydraulic condition within
the watershed.
C.
The Township reserves the right to request additional information
and/or calculations necessary for its review and may approve methods
of calculation not specified in this chapter.
D.
The Township or its designated representative shall be afforded access
to inspect all phases of the installation of the permanent stormwater
management facilities.
E.
During any stage of the work, if the Township determines that the
permanent stormwater management facilities are not being installed
in accordance with the approved stormwater management plan, the Township
shall revoke any existing permits until a revised drainage plan is
submitted and approved, as specified in this chapter.
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 Township in a format that is clear, concise, legible, neat and well organized; otherwise, the SWM site plan shall be rejected. A note on the maps shall refer to the associated computations stormwater management report and erosion and sedimentation control plan by title and date. The cover sheet of the computations and erosion and sedimentation control plan shall refer to the associated maps by title and date. All stormwater management plan and report materials shall be submitted to the Township in a format that is clear, concise, legible, neat, and well organized; otherwise, the plan shall be disapproved and returned to the applicant. Appropriate sections from Chapter 380, Subdivision and Land Development, and other applicable local 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 Washington
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)
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, location address, and lot and
block number 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 1,000 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 waterbodies 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 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)
Overland drainage paths.
(17)
The location and clear identification of the nature of permanent
stormwater BMPs.
(18)
The location of all erosion and sedimentation control facilities,
shown on a separate from than the SWM site plan (typically an E&S
plan).
(19)
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 their designees access to all easements via the nearest public
right-of-way.
(20)
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 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.
B.
SWM site report shall include (but not limited to):
(1)
General data including:
(a)
Project Name.
(b)
Project location; address of the property site.
(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 site report;
(e)
Date of submission and revisions.
(2)
Project description narrative that clearly discusses the project
and provides the following information:
(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]
Include descriptions of all assumptions, methods, references,
and calculations for all stormwater drainage facilities.
[3]
Expected project schedule.
[4]
Location map showing the project site and its location relative
to release rate districts.
[5]
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.
[6]
Total site area, pre and post, which must be equal or have an
explanation as to why it is not.
[7]
Total site impervious area.
[8]
Total off-site areas.
[9]
Number and description of stormwater management facilities.
[10]
Type of development.
[11]
Predevelopment land use.
[12]
Whether site is a stormwater hotspot.
[13]
Whether site is in a defined sensitive area.
[14]
Types of water quality and recharge systems used,
if applicable.
[15]
Complete hydrologic, hydraulic, and structural
computations for all stormwater management facilities.
[16]
A written maintenance plan for all stormwater
features, including detention facilities and other stormwater management
elements.
[17]
Identification of ownership and maintenance responsibility
for all permanent stormwater management facilities.
[18]
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]
Land use for each subarea.
[4]
Hydrologic soil group (HSG) assumptions, curve numbers (CN).
[5]
Time of concentration computed for each subarea.
[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 quality depth and volume requirements.
(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, 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 Township 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 Township 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 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 included as an attachment 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 Washington County Conservation District.
(4)
A NPDES permit.
(5)
Permits from PADEP and ACOE.
(6)
Geologic assessment.
(7)
Soils investigation report, including boring logs, 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.
(9)
Proof of notification to adjacent property owners.
A.
The Township 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 and any other applicable municipal requirement.
B.
The Township 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 an SWM site plan
and report is found to be deficient, the Township may disapprove the
submission and require a resubmission, or, in the case of minor deficiencies,
the Township may accept submission of modifications. All required
permits from PADEP must be obtained prior to approval.
C.
The Township 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 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 Township 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 Township.
All required permits from PADEP must be obtained prior to issuance
of a building permit.
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 Township's concerns documented in
writing, to the Township in accordance with this chapter. The applicable
Township review fee must accompany a resubmission of a disapproved
SWM site plan and report.
The Township's approval of an 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 Township 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 Township signs the approval
for an 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 Township 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 drawing and an explanation of any discrepancies with the approved
SWM site plan shall be submitted to the Township as a prerequisite
for the release of the guarantee or issuance of an occupancy permit.
B.
The record drawing 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.
C.
After receipt of the record drawing and certification of completion
by the Township, the Township may conduct a final inspection.
D.
In no case shall the Township approve the as-built survey until the
Township received a copy of an approved declaration of adequacy, highway
occupancy permit from the PennDOT district office, and any applicable
permits from PADEP. The Township shall not issue any occupancy permits
within a development until the as-built survey is submitted and approved.
E.
The Township's approval of a stormwater management plan and
report package shall be valid for a period not to exceed one year.
This one-year time period shall commence on the date that the Township
signs the approved stormwater management plan and report package.
If stormwater management facilities included in the approved stormwater
management plan and report package have not been constructed, or an
as-built survey of these facilities has not been approved within one-year
time period, then the Township may consider the stormwater management
plan and report package disapproved and may revoke any and all permits
(including occupancy permits for residential dwellings owned and occupied
by someone other than the developer). Stormwater management plan and
report packages that are considered disapproved by the Township shall
be resubmitted in accordance with this chapter.
