A.
A stormwater management plan
and other information specified herein shall be submitted to the municipality
for all lands subdivided or for which land development plans are prepared
after the enactment of this chapter. A stormwater management plan
and other information specified herein shall be submitted at the same
time and together with submission of a subdivision or land development
plan, along with a completed checklist, if available, supplied by
the municipality indicating the items contained within the submission.
B.
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.
C.
All stormwater management plans
shall be submitted to the municipality for review and comment. Such
review shall include a statement by the Municipal Engineer specifying
the provisions of this chapter which have not been met by the plan
as submitted.
D.
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 required a revision of the approved plan or other
construction or activities as defined by Municipal Subdivision and
Land Development or Zoning Regulations[1] shall require the submission of a new, amended, or revised
stormwater management plan and other information specified herein.
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 municipality 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, provide 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
contributing surface runoff to the points of interest.
[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]
Other pertinent information,
as required.
(b)
Summary tables.
[2]
Post-development.
[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]
Post-development
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.
[k]
Reports that do
not clearly indicate the above information may be rejected for review
by the municipality's Engineer or representative 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 on one size. The following
information, unless specifically exempted in writing by the Municipal
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(s).
(3)
The location of the project
relative to highways, municipal boundaries and 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 waterlines on the property
and within 50 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.
(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 construction detail of
any improvements made to sinkholes and the location of all notices
to be posted, as specified in this chapter.
(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 drainage 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 species of
plant 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 municipality.
(25)
A note indicating that
as-built drawings and certificate of completion 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 Patton Township stormwater management regulations, Chapter 310, of the Patton Township Code of Ordinances."
(27)
The location of all erosion
and sedimentation control facilities.
(28)
A statement clearly indicating
the property owner in the case of a site plan or the homeowners' association
in the case of a subdivision plan has primary responsibility for the
maintenance of the stormwater control facilities and conveyance systems
not within the public right-of-way.
C.
Supplemental supporting information
to be submitted where applicable:
(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 U.S. 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 vs. elevation) and all supporting computations.
(d)
Flood routing computations.
(e)
A detail 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
their 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; and
(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.
For all activities regulated by this chapter, 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 (25 Pa. Code Chapter 105 and 106,
respectively), 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 subdivision plan
or land development plan submission for the regulated activity.
B.
The submission for any regulated activity that is not subject to municipal review under Chapter 350, Subdivision and Land Development, or Chapter 425, Zoning, of the Patton Township Code of Ordinances shall be accepted and reviewed in accordance with the policies and procedures established for review of subdivision and land development plans.
C.
Three copies of the stormwater
management plan shall be submitted and distributed as follows:
A.
The Municipal Engineer shall
review the stormwater management plan for consistency with this chapter.
The municipality shall require receipt of a complete plan.
(1)
A stormwater management plan
submitted in conjunction with the initial submission, resubmission,
or submission for minor modification of a subdivision or land development
plan shall be reviewed and approved or disapproved in accordance with
the procedures and policies established for the consideration of subdivision
and land development plans. Municipal approval of a subdivision or
land development plan shall constitute approval of the supporting
stormwater management plan.
(2)
A stormwater management plan
submitted for a regulated activity not requiring the submission of
a subdivision or land development plan shall be reviewed as follows:
(a)
Zoning permit required.
For a regulated activity requiring a zoning permit, but not requiring
a subdivision or land development plan, the stormwater management
plan shall be reviewed by the Municipal Engineer in accordance with
the procedures and policies established for review of subdivision
and land development plans, except there shall be no deemed approval
provision as defined by the Municipalities Planning Code. The zoning
permit application shall not be considered complete until the Municipal
Engineer informs the Zoning Officer that the stormwater management
plan is consistent with the requirements of this chapter. Issuance
of a zoning permit shall constitute approval of the supporting stormwater
management plan.
(b)
Zoning permit not required.
For regulated activity not requiring a zoning permit or a subdivision
or land development plan, the stormwater management plan shall be
reviewed by the Municipal Engineer in accordance with the procedures
and policies established for review of subdivision and land development
plans, except there shall be no deemed approval provision as defined
by the Municipalities Planning Code. When the Municipal Engineer finds
that the stormwater management plan is consistent with the requirements
of this chapter, an approval letter will be provided to the developer.
B.
The municipal approval of a stormwater
management plan approved in conjunction with the initial submission,
resubmission, or submission for minor modification of a subdivision
or land development plan shall be valid concurrently with the approved
subdivision or land development plan. The municipal approval of a
stormwater management plan for a regulated activity not requiring
the approval of a subdivision or land development plan shall be valid
for a period of five years from the date of issuance of a zoning permit
or approval letter from the Municipal Engineer.
C.
The review of plan modifications
and resubmissions shall be conducted in accordance with the procedure
established for the initial submission of a stormwater management
plan.
D.
For regulated activities requiring
a PA DEP joint permit application, the Municipal Engineer shall notify
PA DEP whether the stormwater management plan is consistent with this
chapter and forward a copy of the review letter to the developer.
PA DEP may consider the Municipal Engineer's review comments in determining
whether to issue a permit.
