[Ord. 2003-02, 3/3/2003, § 401]
1. From and after the date of enactment of this Part, a stormwater management
plan and other information specified herein shall be submitted to
the Township for all lands subdivided or for which land development
plans are prepared after the enactment of this Part. A stormwater
management plan and other information specified herein shall be submitted
at the same time and together with submission of a preliminary subdivision
or land development plan, along with a completed checklist supplied
by the Township indicating the items contained within the submission.
2. Such plans and information shall be considered part of said zoning
and subdivision documents and shall be reviewed in accordance with
procedures established thereunder. Preliminary approval or final approval
of a subdivision or land development plan, or the issuance of a zoning
permit, shall be contingent upon submission of a stormwater management
plan and other materials specified herein, and approval of the stormwater
management plan in accordance with provisions of this Part.
3. All stormwater management plans shall be submitted to the Township
Engineer for review and comment. Such review shall include a statement
by the Township Engineer specifying the provisions of this Part, which
have not been met by the plan as submitted.
4. Once a stormwater management plan has been approved together with
a subdivision or land development plan approval, or together with
the issuance of a zoning permit, said stormwater management plan shall
be valid only for the subdivision, land development or zoning permit
approved. Any further development on the lot or lots requiring a revision
of the approved plan or other construction or activities as defined
by Township zoning regulations shall require the submission of a new,
amended or revised stormwater management plan and other information
specified herein.
[Ord. 2003-02, 3/3/2003, § 402]
1. The stormwater management plan shall consist of all applicable calculations,
maps and plans. A note on the maps shall refer to the associated computations
and erosion and sediment pollution control plan by title and date.
The cover sheet of the computations and erosion and sediment pollution
control plan shall refer to the associated maps by title and date.
All stormwater management plan materials shall be submitted to the
Township in a format that is clear, concise, legible, neat and well
organized; otherwise, the stormwater management plan shall be disapproved
and returned to the applicant. Said plan shall be prepared by a registered
professional land surveyor, qualified geologist, landscape architect,
architect or engineer licensed in the State of Pennsylvania, with
said preparer's seal and registration number affixed to the plan.
The following items shall be included in the stormwater management
plan:
A. Stormwater Management Report.
(1)
General description of project.
(2)
General description of permanent stormwater management techniques,
including construction specifications and materials to be used for
stormwater management facilities.
(3)
Complete hydrologic, hydraulic and structural computations for
all stormwater management facilities.
(4)
A written maintenance plan for all stormwater features including
detention facilities and other stormwater management elements.
(5)
Identification of ownership and maintenance responsibility for
all permanent stormwater management facilities.
(6)
The stormwater management report must include a narrative which
clearly discusses the project and summary tables which, at a minimum,
provides the following information:
(a)
Narrative.
1)
The overall stormwater management concept.
2)
The expected project schedule.
4)
Total site area, pre and post, which must be equal or have an
explanation as to why it is not.
5)
Total site impervious area.
7)
Number of stormwater management facilities (ponds), if applicable.
10) Whether site is underlain by carbonate geology.
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) Other pertinent information, as required.
(b)
Summary Tables.
1)
Predevelopment.
a) Hydrologic soil group (HSG) assumptions, curve numbers
(CN).
b) Computation of average slope, hydraulic length,
computed time of concentration.
c) Required peak rate of runoff.
2)
Postdevelopment.
a) Undetained areas, areas to ponds.
b) Land use for each subarea.
c) Hydrologic soil group (HSG) assumptions, curve numbers
(CN).
d) Time of concentration computed for each subarea.
e) Postdevelopment peak rate of runoff routed to ponds
and out.
f) Pond maximum return period design data including
maximum water surface elevation, berm elevation and emergency spillway
elevation.
g) Water quality depth and volume requirements.
h) Recharge volume requirements.
j) Capture volumes required.
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Reports that do not clearly indicate the above information may
be rejected for review by the Township's Engineer or representative
and will be returned to the applicant.
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B. Plan Requirements. Plans for tracts of less than 20 acres shall be
drawn at a scale of one inch equals no more than 50 feet; for tracts
of 20 acres or more, plans shall be drawn at a scale of one inch equals
no more than 100 feet. Plans shall be submitted on the following sheet
sizes: 18 inches by 24 inches, 24 inches by 36 inches or 36 inches
by 42 inches. All lettering shall be drawn to a size to be legible
if the plans are reduced to half size. All sheets comprising a submission
shall be on one size. The following information, unless specifically
exempted in writing by the Township Engineer, must be shown on the
plans, prepared in a form which meets the requirements for recording
in the Office of the Recorder of Deeds of Centre County, Pennsylvania.
The contents of the map(s) shall include, but not be limited to:
(1)
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.
(2)
The date of submission and revision.
(3)
The location of the project relative to highways, municipalities
or other identifiable landmarks.
(4)
Existing contours at intervals of two feet. In areas of steep
slopes (greater than 15%), five-foot contour intervals may be used.
(5)
Existing streams, lakes, ponds or other bodies of water within
the project area.
(6)
Other physical features including flood hazard boundaries, sinkholes,
closed depressions, wetlands, streams, existing drainage courses,
areas of natural vegetation to be preserved, and the total extent
of the upstream area draining through the site. In addition, any areas
necessary to determine downstream impacts, where required for proposed
stormwater management facilities, must be shown.
(7)
The locations of all existing and proposed utilities, sanitary
sewers and water lines within 20 feet of property lines.
(8)
An overlay showing soil names and boundaries, including rock
outcrops.
(9)
Total area of impervious surfaces proposed.
(10)
Proposed structures, roads, paved areas and buildings.
(11)
Final contours at intervals of two feet. In areas of steep slopes
(greater than 15%), five-foot contour intervals may be used.
(12)
A graphic and written scale.
(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 and the extent
of the watershed or subarea that drains through the project site.
(17)
Horizontal and vertical profiles of all open channels, including
hydraulic capacity.
(19)
Access easements around all stormwater management facilities
that would provide ingress to and egress from a public right-of-way.
(20)
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 Part.
(21)
A construction detail of any improvements made to sinkholes
and the location of all notes to be posted, as specified in this Part.
(22)
Complete drainage systems for the site, including details for
construction. All existing drainage features, which are to be incorporated
in the design, shall be so identified. If the site is to be developed
in stages, a general stormwater management plan for the entire site
shall be presented with the first stage and appropriate development
stages for the drainage system shall be indicated.
(23)
Location and selected plan material used for vegetative filter
paths to sinkholes, and the location of all notices to be posted.
(24)
A statement, signed by the landowner, acknowledging the stormwater
management system, is to be maintained in accordance with the approved
Ownership and Maintenance Program and remain a permanent fixture that
can be altered or removed only after approval of a revised plan by
the Township.
(25)
A note indicating that as-built drawings will be provided by
the developer for all stormwater facilities prior to occupancy, or
the release of the surety bond.
(26)
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 Spring Township
Stormwater Management Ordinance."
(27)
The following signature block for the Township Engineer reviewing
the stormwater management plan:
"I,__________, have reviewed this Stormwater Management Plan
in accordance with the Design Standards and Criteria of the Spring
Township Stormwater Management Ordinance."
(28)
The location of all erosion and sedimentation control facilities.
C. Supplemental Information.
(1)
A soil erosion and sediment pollution control plan, where applicable,
including all reviews and approvals, as required by PA DEP.
(2)
Soils investigation report, including boring logs, compaction
requirements and recommendations for construction of detention basins.
(3)
Karst Features Identification and Analysis Reports and a hydrogeologic
assessment of the effects of runoff on sinkholes.
(4)
The effect of the project (in terms of runoff volumes and peak
flows) on adjacent properties and on any existing municipal stormwater
collection system that may receive runoff from the project site.
(5)
A Declaration of Adequacy and Highway Occupancy Permit from
the PA DOT District Office when utilization of a PA DOT storm drainage
system is proposed.
(6)
All permits required by the Pennsylvania Department of Environmental
Protection, and Army Corps of Engineers and other regulatory agencies.
D. Stormwater Management Facilities.
(1)
All stormwater management facilities must be located on a plan
and described in detail.
(2)
When groundwater recharge methods such as seepage pits, beds
or trenches are used, the locations of existing and proposed septic
tank infiltration areas and wells must be shown.
(3)
All calculations, assumptions and criteria used in the design
of the stormwater management facilities must be shown.
(a)
A sketch 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.
(b)
Design computations for the pipe barrel and riser.
(c)
A plot or table of the stage-storage (acre-feet versus elevation)
and all supporting computations.
(d)
Flood routing computations.
(e)
A detailed plan of the trash rack and anti-vortex device.
(4)
Record Set (As-Built) Plans. At the completion of the project,
and as a prerequisite for the release of the guarantee or issuance
of an occupancy permit, the owner or his representative shall:
(a)
Provide certification of completion from a registered professional
verifying that all permanent facilities have been constructed according
to the plans and specifications and approved revisions thereto.
(b)
Provide a set of approved stormwater management plan drawings
showing all approved revisions and elevations and inverts to all manholes,
inlets, pipes and stormwater control facilities.
[Ord. 2003-02, 3/3/2003, § 403]
1. For all activities regulated by this Part, the steps below shall
be followed for submission. For any activities that require a PA DEP
Joint Permit Application and regulated under Chapter 105 (Dam Safety
and Waterway Management) or Chapter 106 (Floodplain Management) of
PA DEP's Rules and Regulations, require a PA DOT Highway Occupancy
Permit, or require any other permit under applicable State or Federal
regulations, the permit(s) shall be part of the plan.
A. The stormwater management plan shall be submitted by the developer
as part of the preliminary plan submission for the regulated activity.
B. Four copies of the stormwater management plan and stormwater management
report shall be submitted.
C. Distribution of the stormwater management plan will be as follows:
(1)
Two copies to the Township accompanied by the requisite municipal
review fee, as specified in this Part.
(2)
One copy to the Township Engineers.
(3)
One copy to the County Planning Commission/Department.
[Ord. 2003-02, 3/3/2003, § 404]
1. The Township Engineer shall review the stormwater management plan
for consistency with the adopted Spring Creek Watershed Act 167 Stormwater
Management Plan. The Township shall require receipt of a complete
plan, as specified in this Part.
2. The Township Engineer shall review the stormwater management plan for any submission or land development against the Township Subdivision and Land Development Ordinance [Chapter
22] provisions not superseded by this Part.
3. For activities regulated by this Part, the Township Engineer shall notify the Township in writing, within 30 calendar days, whether the stormwater management plan is consistent with the Stormwater Management Ordinance [Chapter
26, Part
3]. Should the stormwater management plan be determined to be consistent with the Stormwater Management Ordinance, the Township Engineer will forward an approval letter to the developer with a copy to the Township Secretary.
4. Should the stormwater management plan be determined to be inconsistent with the Stormwater Management Ordinance [Chapter
26, Part
3], the Township Engineer will forward a disapproval letter to the developer with a copy to the Township Secretary citing the reason(s) for the disapproval. Any disapproved stormwater management plans may be revised by the developer and resubmitted consistent with this Part.
5. For regulated activities specified in §§
26-305, Subsections
3C and
3D, of this Part, the Township Engineer shall notify the Township building permit officer in writing, within a time frame consistent with the Township building code and/or Township subdivision ordinance [Chapter
22], whether the stormwater management plan is consistent with the Stormwater Management Ordinance [Chapter
26, Part
3] and forward a copy of the approval/disapproval letter to the developer. Any disapproved stormwater management plan may be revised by the developer and resubmitted consistent with this Part.
6. For regulated activities requiring a PA DEP Joint Permit Application, the Township Engineer shall notify PA DEP whether the stormwater management plan is consistent with the Stormwater Management Ordinance [Chapter
26, Part
3] and forward a copy of the review letter to the Township and the developer. PA DEP may consider the Township Engineer's review comments in determining whether to issue a permit.
7. The Township shall not approve any subdivision or land development for regulated activities specified in §§
26-305, Subsections
3A and
3B, of this Part if the stormwater management plan has been found to be inconsistent with the Stormwater Management Ordinance [Chapter
26, Part
3], as determined by the Township Engineer. All required permits from PA DEP must be obtained prior to approval.
8. The Township building permit office shall not issue a building permit for any regulated activity specified in §
26-305 of this Part if the stormwater management plan has been found to be inconsistent with the Stormwater Management Ordinance [Chapter
26, Part
3], as determined by the Township Engineer or without considering the comments of the Township Engineer. All required permits from PA DEP must be obtained prior to issuance of a building permit.
9. The developer shall be responsible for completing an "as-built survey"
of all stormwater management facilities included in the approved stormwater
management plan. The as-built survey and an explanation of any discrepancies
with the design plans shall be submitted to the Township Engineer
for final approval. In no case shall the Township approve the as-built
survey until the Township receives a copy of an approved Declaration
of Adequacy, Highway Occupancy Permit from the PA DOT District Office,
and any applicable permits from PA DEP.
10. The Township's approval of a stormwater management plan shall be valid for a period not to exceed five years. This five-year time period shall commence on the date that the Township signs the approved stormwater management plan. If stormwater management facilities included in the approved stormwater management plan have not been constructed, or if an as-built survey of these facilities has not been approved within this five-year time period, then the Township may consider the stormwater management plan disapproved and may revoke any and all permits. Stormwater management plans that are considered disapproved by the Township shall be resubmitted in accordance with §
26-336 of this Part.
[Ord. 2003-02, 3/3/2003, § 405]
1. A modification to a submitted stormwater management plan 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 stormwater management plan as determined by the Township Engineer, shall require a resubmission of the modified stormwater management plan consistent with §
26-333 of this Part and be subject to review as specified in §
26-334 of this Part.
2. A modification to an already approved or disapproved stormwater management
plan shall be submitted to the Township, accompanied by the applicable
review. A modification to a stormwater management plan for which a
formal action has not been taken by the Township shall be submitted
to the Township, accompanied by the applicable municipality review
fee.
[Ord. 2003-02, 3/3/2003, § 406]
A disapproved stormwater management plan may be resubmitted, with the revisions addressing the Township Engineer's concerns documented in writing, to the Township Engineer in accordance with §
26-333 of this Part and be subject to review as specified in §
26-334 of this Part. The applicable municipality review fee must accompany a resubmission of a disapproved stormwater management plan.