[Ord. 1018, 6/6/2016]
1.
From and after the date of enactment of this chapter, a stormwater
management site 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 chapter.
A stormwater management site 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 chapter.
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 chapter,
which have not been met by the plan as submitted.
4.
Once a site 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 site stormwater management plan shall be valid only for the approved subdivision, land development, or zoning permit. 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 (Chapter 27) shall require the submission of a new, amended, or revised site stormwater management plan and other information specified herein.
[Ord. 1018, 6/6/2016]
1.
The stormwater management site 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 site stormwater management plan materials
shall be submitted to the Township in a clear, concise, legible, neat,
and well-organized format, including page numbers on all sheets of
the report; otherwise, the stormwater management plan shall be disapproved
and returned to the applicant.
2.
Said plan shall be prepared by a qualified person or qualified professional
with said preparer's seal and registration number affixed to
the plan, or other qualifying credentials included within the report.
3.
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.
3)
Location map.
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.
6)
Total off-site areas.
7)
Number of stormwater management facilities (ponds), if applicable.
8)
Type of development.
9)
Predevelopment land use.
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)
Printout from NOAA Atlas 14 website with current
date or documentation supporting selection of precipitation values
from the current version of the PennDOT IDF curves.
15)
Geologic analysis as defined for water quality
sensitive districts.
16)
Other pertinent information, as required.
(b)
Summary Tables.
2)
Postdevelopment:
a)
Undetained areas, areas to ponds.
b)
Land use for each subarea defined as the smallest
drainage unit of the watershed for which stormwater management criteria
have been established.
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.
i)
Morphology requirements.
j)
Capture volumes required.
3)
Reports that do not clearly indicate the above information may
be rejected for review by the Township Engineer and will be returned
to the applicant.
B.
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 of the same 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(s) and address(es) of
the owner(s) of the property, and the name of the individual and 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, and the location of any permanent
watercourse to which stormwater from the site will drain.
(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 floodplain boundaries, sinkholes,
closed depressions, wetlands, existing drainagecourses, 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 types by name 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.
(13)
A North arrow.
(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.
(18)
Overland drainage paths.
(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 chapter.
(21)
A note on the plan stating the design infiltration rates for
BMPs along with a requirement for postconstruction testing of the
medium to verify that the design infiltration rates have been achieved.
(22)
A construction detail of any improvements made to sinkholes
and the location of all notes to be posted, as specified in this chapter.
(23)
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.
(24)
Location and selected plant material used for vegetative filter
paths to sinkholes, and the location of all notices to be posted.
(25)
A statement, signed by the landowner, acknowledging the stormwater
management system to be a permanent fixture that can be altered or
removed only after approval of a revised plan by the Township.
(26)
A statement; signed by the landowner, acknowledging the stormwater
management system is to be maintained in accordance with the approved
ownership and maintenance program.
(27)
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.
(28)
The following signature block for the qualified person or qualified
professional preparing the stormwater management plan:
|
"I, __________, hereby certify that the Stormwater Management
Plan meets all design standards and criteria of the Ferguson Township
Stormwater Management Ordinance."
|
(29)
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 Ferguson
Township Stormwater Management Ordinance."
|
(30)
The location of all erosion and sedimentation control facilities.
(31)
A tabulation listing each stormwater BMP required for compliance
with this chapter and associated maintenance requirements.
C.
Supplemental Information.
(1)
A soil erosion and sediment pollution control plan, where applicable,
including all reviews and approvals, as required by PADEP.
(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 PADOT District Office when utilization of a PADOT 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.
(7)
All easements, deed restrictions, covenants, and maintenance
measures of the system shall be outlined in an ownership and maintenance
program in accordance with this chapter. For stormwater management
systems to be dedicated to the Township, a maintenance guarantee,
as specified by the Pennsylvania Municipalities Planning Code,[1] may be required by the Township of Ferguson. The Township
has the explicit right to reject any offer of dedication.
[1]
Editor's Note: See 53 P.S. § 10101 et seq.
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 vs. elevation)
and all supporting computations.
(d)
Flood routing computations.
(e)
A detailed plan of the trash rack and antivortex 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 qualified professional
verifying that all permanent facilities have been constructed according
to the plans and specifications and approved revisions thereto, that
field observations were made at critical stages of construction, testing
was conducted under the direction of the qualified professional, and
that, in the qualified professional's opinion, the facilities
will function as designed.
(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.
(c)
Infiltration testing.
1)
Provide a postconstruction infiltration testing report from a qualified professional to verify the design infiltration rates were achieved. If design infiltration rates are not achieved documentation shall be submitted to the Township Engineer demonstrating that the infiltration rates and basin performance meet Township regulatory requirements. Infiltration testing shall be performed at the final infiltration surface in basins and subsurface facilities. Testing shall be accomplished using a double ring infiltrometer, basin flood test, or other test approved in advance by the Township Engineer. Infiltrometer testing and analysis shall be performed in accordance with procedures outlined in § 26-304, Subsection 3F, with the following exception:
a)
Infiltration testing shall be performed at the final
infiltration surface.
2)
Infiltration test locations shall be documented on the as-built
plans.
(d)
Provide an as-built narrative describing and illustrating critical
stages of construction. It is recommended that a preconstruction meeting
be held to review the scope of the construction observation and documentation
to be provided. At a minimum, the following information shall be included:
1)
Narrative and photographic documentation of construction techniques
and measures used to protect infiltration surfaces from being compacted
or otherwise compromised.
2)
Photographic documentation of all stages of construction for
subsurface facilities.
4)
Copies of field inspection notes documenting critical elements
of construction.
[Ord. 1018, 6/6/2016]
1.
For all activities regulated by this chapter, the steps below shall
be followed for submission. For any activities that require a PADEP
joint permit application and regulated under Chapter 105 (Dam Safety
and Waterway Management) or Chapter 106 (Floodplain Management) of
PADEP's Rules and Regulations, require a PADOT highway occupancy
permit, or require any other permit under applicable state or federal
regulations, the permit(s) shall be part of the plan.
A.
Two copies of the site stormwater management plan and report and
supplemental information shall be submitted by the applicant as part
the review of any regulated activity.
[Ord. 1018, 6/6/2016]
1.
The Township Engineer shall review the stormwater management site
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 chapter.
2.
The Township Engineer shall review the stormwater management site
plan for consistency with the Ferguson Township Stormwater Management
Ordinance. The Township shall require receipt of a complete plan,
as specified in this chapter.
3.
The Township shall not approve any application for regulated activities specified in § 26-104, Subsection 3A and B, of this chapter if the stormwater management site plan has been found to be inconsistent with the Ferguson Township Stormwater Ordinance as determined by the Township Engineer. All required permits from PADEP must be obtained prior to approval.
4.
The Township Zoning Administrator or the Centre Region Code Director shall not issue a zoning or building permit for any regulated activity specified in § 26-104 of this chapter if the stormwater management site plan has been found to be inconsistent with the Township Stormwater Management Ordinance, as determined by the Township Engineer. All required permits from PADEP must be obtained prior to issuance of a building permit.
5.
The developer shall be responsible for completing an "as-built survey"
of all stormwater management facilities included in the approved stormwater
management site 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 prior to occupancy or release of surety.
6.
The Township's approval of a stormwater management plan shall
be valid for a period consistent with the Pennsylvania Municipalities
Planning Code,[1] not to exceed five years. This time period shall commence on the date that the Township signs the approved stormwater management site plan. If stormwater management facilities included in the approved stormwater management site plan have not been constructed, or if an as-built survey of these facilities has not been approved within this time period, then the Township may consider the stormwater management site plan disapproved and may revoke any and all permits. Stormwater management site plans that are considered disapproved by the Township shall be resubmitted in accordance with § 26-406 of this chapter.
[1]
Editor's Note: See 53 P.S. § 10101 et seq.
[Ord. 1018, 6/6/2016]
1.
A modification to a submitted stormwater management site 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 site plan as determined by the Township Engineer, shall require a resubmission of the modified stormwater management site plan consistent with § 26-403 of this chapter and be subject to review as specified in § 26-404 of this chapter.
2.
A modification to an already approved or disapproved stormwater management
site plan shall be submitted to the Township.
[Ord. 1018, 6/6/2016]
A disapproved stormwater management site plan may be resubmitted with the revisions addressing the Township Engineer's concerns documented in writing, to the Township Engineer in accordance with § 26-403 of this chapter and be subject to review as specified in § 26-404 of this chapter. The applicable Township review fee must accompany a resubmission of a disapproved stormwater management site plan.
