[Ord. No. 1102, 9/3/2024]
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 Stormwater Engineer for review and comment. Such review shall include a statement by the Township Stormwater 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. No. 1102, 9/3/2024]
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) 
Pre-development 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) 
Print-out 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.
1) 
Pre-development.
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) 
Post-development.
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) 
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.
3) 
Reports that do not clearly indicate the above information may be rejected for review by the Township Stormwater 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' x 24", 24" x 36", or 36" x 42". 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 Stormwater 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 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 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 sub-area 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 post-construction 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 Stormwater 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 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.
(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 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 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 post-construction 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 Stormwater 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 Stormwater Engineer. Infiltrometer testing and analysis shall be performed in accordance with procedures outlined in § 26-304, Subsection 3H, with the following exception:
2) 
Infiltration testing shall be performed at the final infiltration surface.
3) 
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 pre-construction 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.
3) 
A copy of the final infiltration report [as defined in Subsection 3D(4)(c) above].
4) 
Copies of field inspection notes documenting critical elements of construction.
[Ord. No. 1102, 9/3/2024]
1. 
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, 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. 
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. No. 1102, 9/3/2024]
1. 
The Township Stormwater Engineer shall review the stormwater management site plan for consistency with this chapter. The Township shall require receipt of a complete plan, as specified in this chapter.
2. 
The Township Stormwater 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. The Township shall complete a review of the stormwater site plan within 45 days of the Township Stormwater Engineer receiving a complete submission. If a plan requires a resubmission, the Township shall complete additional reviews within 45 days of receiving the revised submission.
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 Stormwater Engineer. All required permits from PA DEP 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 Stormwater Engineer. All required permits from PA DEP 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 Stormwater 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. No. 1102, 9/3/2024]
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 re-design 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 Stormwater 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. No. 1102, 9/3/2024]
A disapproved stormwater management site plan may be resubmitted, with the revisions addressing the Township Stormwater Engineer's concerns documented in writing, to the Township Stormwater 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.