A.
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.
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
site plan and other materials specified herein and approval of the
stormwater management site plan in accordance with provisions of this
chapter.
C.
All stormwater management site 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
that have not been met by the plan as submitted.
D.
Once a stormwater management site 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 site
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[1] shall require the submission of a new, amended, or revised
stormwater management site plan and other information specified herein.
The SWM 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 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 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 commonwealth of Pennsylvania, with said preparer's
seal and registration number affixed to the plan.
The following items shall be included in the SWM site 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)
Required information:
(a)
The stormwater management report must include a narrative that
clearly discusses the project, and summary tables, which, at a minimum,
provide the following information:
[1]
Narrative:
[a]
The overall stormwater management concept;
[b]
The expected project schedule;
[c]
Location map;
[d]
Total site area, pre and post, which must be equal
or have an explanation as to why it is not;
[e]
Total site impervious area;
[f]
Total off-site areas;
[g]
Number of stormwater management facilities (ponds)
if applicable;
[h]
Type of development;
[i]
Predevelopment land use;
[j]
Whether the site is underlain by carbonate geology;
[k]
Whether the site is water-quality-sensitive (WQS)
development;
[l]
Whether the site is in a defined sensitive area;
[m]
Types of water quality and recharge systems used,
if applicable;
[n]
Other pertinent information, as required.
[2]
Summary tables:
[b]
Post-development:
[i]
Undetained areas; areas to ponds;
[ii]
Land use for each subarea;
[iii]
Hydrologic soil group (HSG) assumptions; curve
numbers (CN);
[iv]
Time of concentration computed for each subarea;
[v]
Post-development peak rate of runoff routed to
ponds and out;
[vi]
Pond maximum return period design data, including
maximum water surface elevation, berm elevation, and emergency spillway
elevation;
[vii]
Water quality depth and volume requirements;
[viii]
Recharge volume requirements;
[ix]
Morphology requirements;
[x]
Capture volumes required.
(b)
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.
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 one size. The following information, unless specifically exempted
in writing by the Township Engineer, must be shown on the plans, prepared
in a form that 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 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 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 notes 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 SWM site 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 to be 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 site plan:
|
"I, __________, hereby certify that the stormwater management
site plan meets all design standards and criteria of the College Township
Stormwater Management Ordinance."
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(27)
The following signature block for the Township Engineer reviewing
the stormwater management site plan:
|
"I, __________, have reviewed this stormwater management site
plan in accordance with the design standards and criteria of the College
Township Stormwater Management Ordinance."
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(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 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 PADEP, 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 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; and
(b)
Provide a set of approved stormwater management site 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 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.
The Township Engineer shall review the SWM 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.
C.
For activities regulated by this chapter, the Township Engineer shall
notify the Township in writing, within 30 calendar days, whether or
not the SWM site plan is consistent with the stormwater management
plan. Should the SWM site plan be determined to be consistent with
the stormwater management plan, the Township Engineer will forward
an approval letter to the developer, with a copy to the Township Secretary.
D.
Should the SWM site plan be determined to be inconsistent with the
stormwater management plan, the Township Engineer will forward a disapproval
letter to the developer, with a copy to the Township, citing the reason(s)
for the disapproval. Any disapproved SWM site plans may be revised
by the developer and resubmitted consistent with this chapter.
E.
For regulated activities specified in § 175-5C(3) and (4) of this chapter, the Township Engineer shall notify the Township Zoning Officer in writing, within a time frame consistent with the Township Code and/or Township Subdivision Ordinance, whether or not the SWM site plan is consistent with the stormwater management plan and forward a copy of the approval/disapproval letter to the developer. Any disapproved SWM site plan may be revised by the developer and resubmitted consistent with this chapter.
F.
For regulated activities requiring a PADEP joint permit application,
the Township Engineer shall notify PADEP whether or not the SWM site
plan is consistent with the stormwater management plan and forward
a copy of the review letter to the Township and the developer. PADEP
may consider the Township Engineer's review comments in determining
whether to issue a permit.
G.
The Township shall not approve any subdivision or land development for regulated activities specified in § 175-5C(1) and (2) of this chapter if the SWM site plan has been found to be inconsistent with the stormwater management plan, as determined by the Township Engineer. All required permits from PADEP must be obtained prior to approval.
H.
The Township Zoning Office shall not issue a zoning permit for any regulated activity specified in § 175-5 of this chapter if the SWM site plan has been found to be inconsistent with the stormwater management plan, as determined by the Township Engineer, or without considering the comments of the Township Engineer. All required permits from PADEP must be obtained prior to issuance of a building permit.
I.
The developer shall be responsible for completing an as-built survey
of all stormwater management facilities included in the approved SWM
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. 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 PADOT District Office,
and any applicable permits from PADEP.
J.
The Township's approval of a SWM site 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 SWM site plan. If stormwater management facilities included in the approved SWM site 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 SWM site plan disapproved and may revoke any and all permits. SWM site plans that are considered disapproved by the Township shall be resubmitted in accordance with § 175-29 of this chapter.
A.
A modification to a submitted SWM 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 SWM site plan as determined by the Township Engineer, shall require a resubmission of the modified SWM site plan consistent with § 175-26 of this chapter and shall be subject to review, as specified in § 175-27 of this chapter.
B.
A modification to an already approved or disapproved SWM site plan
shall be submitted to the Township, accompanied by the applicable
review. A modification 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 fee.
A disapproved SWM site plan may be resubmitted, with the revisions addressing the Township Engineer's concerns documented in writing, to the Township Engineer in accordance with § 175-26 of this chapter and shall be subject to review as specified in § 175-27 of this chapter. The applicable Township review fee must accompany a resubmission of a disapproved SWM site plan.
