[Ord. 1-2012, 9/19/2012, § 401]
For any of the activities regulated by this chapter, the preliminary or final approval of subdivision and/or land development plans, the issuance of any building or occupancy permit, or the commencement of any earth disturbance activity may not proceed until the property owner, applicant, or his/her agent has received written approval of a SWM site plan from the Township and an adequate erosion and sediment control plan review by the Conservation District unless the project qualifies for an exemption in §
19-106.
[Ord. 1-2012, 9/19/2012, § 402]
1. The SWM site plan shall consist of a general description of the project including sequencing items described in §
19-304, calculations, maps, and plans. A note on the maps shall refer to the associated computations and erosion and sediment control plan by title and date. The cover sheet of the computations and erosion and sediment control plan shall refer to the associated maps by title and date. 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 not be accepted for review and shall be returned to the applicant.
2. The following items shall be included in the SWM site plan, when
applicable:
A. General.
(1)
General description of the project, including those areas described in §
19-304, Subsection 1B.
(2)
General description of proposed permanent stormwater management
techniques, including construction specifications of the materials
to be used for stormwater management facilities.
(3)
Complete hydrologic, hydraulic, and structural computations
for all stormwater management facilities.
(4)
An erosion and sediment control plan, including all reviews
and letters of adequacy from the Conservation District.
(5)
A general description of proposed nonpoint source pollution
controls.
(6)
The SWM Site Plan Application and completed fee schedule form
and associated fee (Appendix 19-C-1).
(7)
The SWM Site Plan Checklist (Appendix 19-C-2).
B. Maps or Plan Sheets. Map(s) of the project area shall be submitted
on twenty-four-inch by thirty-six-inch sheets and/or shall be prepared
in a form that meets the requirements for recording at the offices
of the Recorder of Deeds of Delaware County. If the SALDO has more
stringent criteria than this chapter, then the more stringent criteria
shall apply. The contents of the map(s) shall include, but not be
limited to:
[Amended by Ord. No. 3-2022, 9/21/2022]
(1)
The location of the project relative to highways, municipal
boundaries, or other identifiable landmarks.
(2)
Existing contours at intervals of two feet.
(3)
Existing streams, lakes, ponds, or other waters of the commonwealth
within the project area.
(4)
Other physical features, including flood hazard boundaries,
stream buffers, existing drainage courses, areas of natural vegetation
to be preserved, and the total extent of the upstream area draining
through the site.
(5)
The locations of all existing and proposed utilities, sanitary
sewers, and water lines within 50 feet of property lines.
(6)
An overlay showing soil names and boundaries.
(7)
Limits of earth disturbance, including the type and amount of
impervious area that would be added.
(8)
Proposed structures, roads, paved areas, and buildings.
(9)
Final contours at intervals of two feet.
(10)
The name of the development, the name and address of the owner
of the property, and the name of the individual or firm preparing
the plan.
(12)
A graphic and written scale of one inch equals no more than
50 feet; for tracts of 20 acres or more, the scale shall be one inch
equals no more than 100 feet.
(14)
The total tract boundary and size with distances marked to the
nearest foot and bearings to the nearest degree.
(15)
Existing and proposed land use(s).
(16)
A key map showing all existing man-made features beyond the
property boundary that would be affected by the project.
(17)
Location of all open channels.
(18)
Overland drainage patterns and swales.
(19)
A fifteen-foot-wide access easement around all stormwater management
facilities that would provide ingress to and egress from a public
right-of-way.
(20)
The location of all erosion and sediment control facilities.
(21)
A note on the plan indicating the location and responsibility
for maintenance of stormwater management facilities that would be
located off-site. All off-site facilities shall meet the performance
standards and design criteria specified in this chapter.
(22)
A statement, signed by the applicant, acknowledging that any
revision to the approved SWM site plan must be approved by the Thornbury
Township, and that a revised erosion and sediment control plan must
be submitted to the Conservation District for a determination of adequacy.
(23)
The following signature block, signed and sealed by the qualified
licensed professional responsible for the preparation of the SWM site
plan:
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"I, (Licensed Professional), on this date (date of signature),
hereby certify that the SWM site plan meets all design standards and
criteria of the Thornbury Stormwater Management Code." Statement shall
be sealed and dated.
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(24)
The following signature block for the Township:
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"On behalf of Thornbury Township, (municipal official or designee),
on this date (date of signature), has reviewed and hereby certifies
to the best of my knowledge that the SWM site plan meets all design
standards and criteria of the Thornbury Stormwater Management Code."
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3. Supplemental information to be submitted to the Township:
A. A written description of the following information shall be submitted
by the applicant and shall include:
(1)
The overall stormwater management concept for the project designed in accordance with §
19-304.
(2)
Stormwater runoff computations as specified in this chapter.
(3)
Stormwater management techniques to be applied both during and
after development.
(4)
Expected project time schedule.
(5)
Development stages or project phases, if so proposed.
(6)
An operations and maintenance plan in accordance with §
19-702 of this chapter.
B. An erosion and sediment control plan.
C. A description of the effect of the project (in terms of runoff volumes
and peak flows) on adjacent properties and on any existing Township
stormwater collection system that may receive runoff from the project
site.
D. A Declaration of Adequacy and Highway Occupancy Permit from the Pennsylvania
Department of Transportation (PennDOT) District Office when utilization
of a PennDOT storm drainage system is proposed.
4. Stormwater Management Facilities.
A. All stormwater management facilities must be located on a plan and
described in detail.
B. The locations of existing and proposed septic tank infiltration areas
and wells must be shown.
[Amended by Ord. No. 3-2022, 9/21/2022]
C. All calculations, assumptions, loading ratios (guidelines presented
in the PA BMP Manual), and criteria used in the design of the stormwater
management facilities must be shown.
[Ord. 1-2012, 9/19/2012, § 403]
1. The Township shall require receipt of a complete SWM site plan, as
specified in this chapter.
A. Proof of application or documentation of required permit(s) or approvals
for the programs listed below shall be part of the plan, if applicable:
(1)
NPDES permit for stormwater discharges from construction activities.
(2)
PADEP permits as needed.
(a)
PADEP Joint Permit Application.
(b)
Chapter 105 (Dam Safety and Waterway Management).
(c)
Chapter 106 (Floodplain Management).
(3)
PennDOT Highway Occupancy Permit.
(4)
Any other permit under applicable state or federal regulations.
B. The plan shall be coordinated with the state and federal permit process and the Township SALDO [Chapter
22] review process. The process implementing the provisions in this chapter is illustrated in Appendices 19-D-1 and 19-D-2.
C. For projects that require SALDO [Chapter
22] approval, the SWM site plan shall be submitted by the applicant as part of the preliminary plan submission where applicable for the regulated activity.
D. For regulated activities that do not require SALDO [Chapter
22] approval, see §
19-301, General Requirements.
E. Five copies of the SWM site plan shall be submitted by the applicant
for review in accordance with established criteria and procedures:
(1)
Two copies to the Township accompanied by the requisite Township
review fee, as specified in this chapter.
(2)
Two copies to the County Conservation District.
(3)
One copy to the Township Engineer.
F. Any submissions to the agencies listed above that are found to be
incomplete shall not be accepted for review and shall be returned
to the applicant with a notification in writing of the specific manner
in which the submission is incomplete.
[Ord. 1-2012, 9/19/2012, § 404]
1. SWM plans shall be submitted to the Township for review by the Township Engineer for consistency with this chapter and the respective Act 167 Stormwater Management Plan. Any plan found incomplete may not be accepted for review and may be returned to the applicant. The Township Engineer will review the SWM site plan for any subdivision or land development against the Township SALDO [Chapter
22] provisions not otherwise superseded by this chapter.
2. The applicant shall respond to the Conservation District comments
on the SWM site plan prior to being considered for final approval
by the Township.
3. For activities regulated by this chapter (§
19-105), the Municipal Engineer will notify the applicant and Thornbury Township, in writing, with a copy to the Building Code Officer, within 30 calendar days, whether the SWM site plan is consistent with the stormwater management plan.
[Amended by Ord. No. 3-2022, 9/21/2022]
A. If the Township Engineer determines that the SWM site plan is consistent
with this chapter, the Township Engineer will forward a letter of
consistency to Thornbury Township, who will then forward a copy to
the applicant.
B. If the Township Engineer determines that the SWM site plan is inconsistent
or noncompliant with this chapter, the Township Engineer will forward
a letter to Thornbury Township, with a copy to the applicant, citing
the reason(s) and specific chapter sections for the inconsistency
or noncompliance. Inconsistency or noncompliance may be due to inadequate
information to make a reasonable judgment as to compliance with the
stormwater management plan. Any SWM site plans that are inconsistent
or noncompliant may be revised by the applicant and resubmitted when
consistent with this chapter.
4. For regulated activities under this chapter that require an NPDES
permit application, the applicant shall forward a copy of the Township
Engineer's letter stating that the SWM site plan is consistent with
this chapter to the Conservation District. PADEP and the Conservation
District may consider the Township Engineer's review comments in determining
whether to issue a permit.
5. The Township will not grant preliminary or final approval to any
subdivision or land development for regulated activities specified
in this chapter if the SWM site plan has been found by the Township
Engineer to be inconsistent with this chapter. All required permits
from PADEP must be obtained prior to approval of any subdivision or
land development.
6. No building permits for any regulated activity specified in this
chapter will be approved by the Township if the SWM site plan has
been found to be inconsistent with this chapter, as determined by
the Township Engineer and Conservation District, or without considering
the comments of the Township Engineer and Conservation District. All
required permits from PADEP must be obtained prior to issuance of
a building permit.
7. The applicant shall be responsible for completing record drawings
of all stormwater management facilities included in the approved SWM
site plan. The record drawings and an explanation of any discrepancies
with the design plans shall be submitted to the Township Engineer
for final approval. In no case will the Township approve the record
drawings until the Township receives a copy of an approved Declaration
of Adequacy and/or Highway Occupancy Permit from the PennDOT District
office, NPDES permit, and any other applicable permits or approvals
from PADEP or the Conservation District. The above permits and approvals
must be based on the record drawings.
8. The Township's approval of a SWM site plan shall be valid for a period not to exceed five years commencing on the date that the Township signs the approved SWM site plan. If stormwater management facilities included in the approved SWM site plan have not been constructed, or if constructed, record drawings of these facilities have not been approved within this five-year time period, then the Township may consider the SWM site plan inconsistent or noncompliant and may revoke any and all permits. SWM site plans that are determined to be inconsistent or noncompliant by the Township shall be resubmitted in accordance with §
19-406 of this chapter.
[Ord. 1-2012, 9/19/2012, § 405]
1. A revision to a submitted SWM site plan under review by the Township for a development site that involves the following shall require a resubmission to the Township of a revised SWM site plan consistent with §
19-403 of this chapter and be subject to review as specified in §
19-404 of this chapter:
A. Change in stormwater management facilities or techniques.
B. Relocation or redesign of stormwater management facilities.
C. Is necessary because soil or other conditions are not as stated on
the SWM site plan as determined by the Township Engineer.
2. A revision to an already approved or inconsistent or noncompliant
SWM site plan shall be submitted to the Township, accompanied by the
applicable Township review and inspection fee. A revision to a SWM
site plan for which a formal action has not been taken by the Township
shall be submitted to the Township accompanied by the applicable Township
review and inspection fee.
[Ord. 1-2012, 9/19/2012, § 406]
An inconsistent or noncompliant SWM site plan may be resubmitted with the revisions addressing the Township Engineer's concerns documented in writing. It must be addressed to the Township in accordance with §
19-403 of this chapter, distributed accordingly, and be subject to review as specified in §
19-404 of this chapter. The applicable Township review and inspection fee must accompany a resubmission of an inconsistent or noncompliant SWM site plan.