Borough of Edgeworth, PA
Allegheny County
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Table of Contents
Table of Contents

§ 107-15 General requirements for stormwater management.

A. 
Prior to the final approval of all subdivision and/or land development plans submitted to Edgeworth Borough, the owner, subdivider, landowner or legal representative shall submit a stormwater management plan to the Borough for review and approval.
B. 
In the case of subdivision and land development activities, the submission requirements and procedures of the stormwater management plan shall be in accordance with the Subdivision and Land Development Ordinance[1] of Edgeworth Borough.
[1]
Editor's Note: See Ch. 113, Subdivision and Land Development.
C. 
The stormwater management plan will be submitted to Edgeworth Borough with the subdivision plan to allow for timely review and inclusion in the final subdivision plan of any revision(s) which may result from the reviews of the Allegheny County Planning Commission and the Allegheny County Conservation District.
(1) 
Evidence that the stormwater management plan has been submitted to Edgeworth Borough or Allegheny County Conservation District shall be presented to the Borough.
(2) 
The review and comments of the Allegheny County Conservation District and/or Municipal Engineer shall be considered by the governing body in taking action of subdivision and land development plans.
D. 
The final stormwater management plan approved by Edgeworth Borough shall become a supplement to the final subdivision plan and be subject to all rules, regulations and procedures pertaining thereto, as well as the following requirement:
(1) 
Prior to the final approval of subdivision or land development plan by Edgeworth Borough, the landowner must provide security to Edgeworth Borough as stipulated in Act 247 Pennsylvania Municipalities Planning Code).[2]
[2]
Editor's Note: See 53 P.S. § 10101 et seq.

§ 107-16 Exemptions.

The following activities are specifically exempt from this part:
A. 
Use of land for gardening primarily for home consumption.
B. 
Agricultural and silviculture use of lands when operated in accordance with a farm conservation plan approved by the local soil conservation district or when it is determined by the local soil conservation district that such use will not cause excessive erosion and sedimentation.
C. 
Small developments.
(1) 
At the time of application, the Borough Engineer shall determine if the development qualifies as a small development, and therefore is eligible for a simplified stormwater plan submission. For the purposes of this section, a small development is any development which results (or will result when fully constructed) in the creation of 5,000 or less square feet of impervious surface area.
(2) 
A small development shall be exempt from the preparation of a stormwater management plan as specified Article III. However, such developments shall provide safe management of stormwater runoff in accordance with the performance standards of Article III and as approved by the Borough Engineer.
(3) 
Applications for small developments shall include a plan which describes, narratively and graphically, the type and location of proposed on-site stormwater management techniques for the proposed connection to an existing storm sewer system. The plan shall show accurately site boundaries, five-foot-interval contours, location of watershed and/or subarea boundaries on the site (if applicable) and any watercourses, floodplains or existing drainage facilities or structures located on the site. Depending upon actual site conditions, number of lots involved and similar considerations, the Borough Engineer shall determine if the plan must be prepared by a registered professional engineer.
(4) 
The Borough Engineer shall review and approve the proposed provisions for stormwater management for small developments. Where the applicant is proposing to connect to an existing storm sewer, the Borough Engineer shall determine that sufficient capacity exists in the storm sewer from the point of connection to the point of outlet in the natural drainage system. The Borough Engineer shall also determine if the proposed development site is part of a larger parcel or tract subject to any specific stormwater management controls contained in a prior plan.
(5) 
For a parcel or tract of land held under single ownership, only one application for a small development, as defined above, shall be permitted before requiring a stormwater management plan for the entire parcel. A project cannot be phased to circumvent the stormwater requirements by using the exemption for small developments.

§ 107-17 Plan requirements.

The stormwater management plan shall consist of three parts:
A. 
Part I: a narrative report as a portion of the impact statement required for the review of proposed site plans, conditional uses, subdivisions, and zoning district amendments. The narrative report shall be a general statement of the project giving the purpose and engineering assumptions and calculations for control measures and facilities. The following information shall be included:
(1) 
General description of the project.
(2) 
General description of accelerated runoff control plan.
(3) 
General description of erosion and sedimentation control plan.
(4) 
Expected project time schedule, including anticipated start and completion dates.
(5) 
Project's stormwater district, location and watershed characteristics.
(6) 
On-site detention methods.
(7) 
Hydraulic and hydrologic calculations, methodology and basis of design. Computation of hydraulic and energy grade lines shall be included. All drainage facilities shall be designed to contain the energy grade line for the peak flow rate for the design storm within the structure. Swales and channels shall provide at least one foot of freeboard above the energy grade line.
(8) 
Brief soil description.
B. 
Part II - preliminary plans: a comprehensive plan, in preliminary form (or in combined preliminary and final plan form), designed to safely handle the stormwater runoff, detain the increased stormwater runoff, and control erosion and sedimentation. The plans shall provide, and be accompanied by, maps or other descriptive material indicating the feasibility of the plan and showing the following:
(1) 
The extent and area of each watershed tributary to the existing and future drainage channels in the development.
(2) 
The street storm sewers and other storm drains to be built, the basis of their design, and outfall and outlet locations and elevations, receiving stream or channel and its high water elevation, the functioning of the drains during high water conditions.
(3) 
The parts of the proposed street system where pavements are planned to be depressed sufficiently to convey or temporarily store overflow from storm sewers and over-the-curb flows resulting from high intensity rainstorms and the outlets for such overflow.
(4) 
Existing streams and floodplains to be maintained and new channels to be constructed, their locations, cross-sections and profiles.
(5) 
Proposed culverts and bridges to be built, their materials, elevations, waterway openings and basis of design.
(6) 
Existing detention ponds and basins to be maintained, enlarged, or otherwise altered and new ponds or basins to be built and the basis of their design.
(7) 
The estimated location and percentage of the total development of land area which will be used for impervious surfaces after construction is completed.
(8) 
The slope, type and size of all proposed and existing sewers and other waterways.
(9) 
All existing topographic conditions of the site, including elevations, watercourses, trees and other significant natural features.
(10) 
All existing buildings, sewers, waterlines and other significant man-made features.
(11) 
Estimated depth, shape, size and storage of any proposed retention facility.
(12) 
One or more typical cross-sections of all existing and proposed channels or other open drainage facilities, showing the elevation of the existing land and the proposed changes thereto, together with the high water elevations expected from the one-hundred-year storm under the controlled conditions called for by this part, and the relationship of structures, streets and other utilities.
(13) 
A site plan showing the dimensions of the site with existing and proposed structures properly located, together with contours of the terrain after proposed grading.
C. 
Part III - final plan: Upon approval of the preliminary plan, a final plan shall be submitted to the Municipal Engineer. The final plan shall provide all descriptive material and maps previously submitted and required prior to the final plan, in addition to the following items:
(1) 
All calculations, assumptions and criteria used in the design of the storm sewer system, detention facilities and sediment and erosion control operations.
(2) 
All plans and profiles of proposed storm sewers and open channels including horizontal and vertical controls, elevations, sizes, slopes and materials. All drainage facilities shall be designed to contain the energy grade line for the peak flow rate for the design storm within the structure. Swales and channels shall provide at least one foot of freeboard above the energy grade line.
(3) 
Locations, dimensions and design details required for the construction of all facilities.
(4) 
For all detention basins, a plot or tabulation of storage volumes with corresponding water surface elevations and of the basin outflow rates for those water surface elevations.
(5) 
For all detention basins, design hydrographs of inflow and outflow for the peak design flows from the site under natural and developed conditions.
(6) 
A description of operation for all detention basins.
(7) 
Contours of finished project site that adequately describe the final topography.
(8) 
The staging of earthmoving activities and program of operation.
(9) 
All information relative to the design and operation of emergency spillways.
(10) 
Emergency routing or outfall should be shown for storm runoff in the event of failure of off-site drainage structures.
(11) 
When major control facilities, such as retention basins, are planned, soil structures and characteristics shall be investigated. Plans and data prepared by a licensed professional engineer or geologist with experience and education in soil mechanics shall be submitted. These submissions should consider and offer design solutions for frost heave potential, shrink-swell potential, soil bearing strength, water infiltration, soil settling characteristics, fill and backfilling procedures and soil treatment techniques as required to protect the improvements or structures.
(12) 
All erosion and sedimentation control measures, temporary as well as permanent, having sufficient detail in order to clearly indicate effectiveness of the plan.
(13) 
Project specifications relative to stormwater control, erosion and sedimentation.
(14) 
Evidence that all on-site and off-site easements required to convey runoff flow to an existing public drainage facility or a permanent stream have been granted to the operating entity.
(15) 
Provide a list of adjacent property owners within 200 feet of the subject property and documentation that the adjacent property owners have been notified of the proposed project.
(16) 
Provide the information to conform with the requirements noted in Appendices 1 through 6.[1]
[1]
Editor's Note: Said appendices are on file in the Borough offices.

§ 107-18 Plan submission.

A. 
The Stormwater Management narrative and the preliminary plan may accompany, and be a part of, the site plan submission, required for approval of Edgeworth Borough.
(1) 
Coordination with public agencies. The stormwater management control plan and all information and procedures relating thereto shall in all respects be in compliance with the applicable provisions of this part. It is the responsibility of the owner, subdivider, landowner or legal representative to coordinate the plans with respective public service agencies set forth in this part.
(2) 
Fee. The application form shall be accompanied by the requisite fee as set forth in § 107-33 of this part and by two copies of all required material and six sets of black-and-white or blue-and-white prints of the plan.
(3) 
Plan review.
(a) 
If deemed necessary, upon receipt of the plan, the reviewing body shall forward one copy of the plan and one copy of all the other material to the Allegheny County Conservation District for review. Comments from the District may be received within 30 days by the reviewing body.
(b) 
In cases where the stormwater management and erosion and sedimentation control project fronts on an existing or proposed state highway, the reviewing body may require that a copy of the plans and pertinent data be submitted to the Pennsylvania Department of Transportation for review.
B. 
The Planning Commission will consider the plan to determine if it meets the standards set forth in this part.
C. 
The Planning Commission shall act on any preliminary plan within 60 days of its being received. In the event that any variance from this part is requested by the applicant or is deemed necessary for approval, the variance and the reasons for its necessity shall be entered into the records of Edgeworth Borough Council.

§ 107-19 Plan approval.

A. 
The Edgeworth Borough Planning Commission shall recommend whether the plan shall be approved, approved with modifications or disapproved, and shall notify the applicant in writing thereof, including, if approved with modifications or disapproval, a statement of reasons for such action, generally not later than five days following the decision.
B. 
When the application is not recommended for approval in terms as filed, the decision shall specify the defects found in the application and describe the requirements which have not been met and shall, in each case, cite the provisions of the part.
C. 
Failure of the Edgeworth Borough Planning Commission to render a decision and communicate it to the applicant within the sixty-day time limit and in the manner required herein shall be deemed to be a recommendation for approval of the application in terms as presented unless the applicant has agreed in writing to an extension of time or change in the prescribed manner of presentation of communication of the decision, in which case, failure to meet the extended time or change in manner of presentation of communication shall have like effect.
D. 
Upon approval, the plan shall be submitted to the Edgeworth Borough Council as a part of the final subdivision or land development plan.
E. 
The provisions of this section are directory only, and not mandatory.

§ 107-20 Adherence to approved plan.

It shall be unlawful for any person, firm or corporation to undertake any earth disturbing activity on any property except as provided for in the stormwater management plan approved pursuant to this part. It shall be unlawful to alter or remove any control structure required by the stormwater management plan pursuant to this part or to allow the property to remain in a condition which does not conform to the approved stormwater management plan.

§ 107-21 Dedication of facilities.

All drainage and stormwater control facilities serving private commercial or industrial developments shall remain the property of the landowner(s). Where multiple landowners are involved, recorded maintenance agreements shall be provided to the Borough and annual maintenance bonds shall be filed to warrant maintenance. All drainage and stormwater control facilities serving residential subdivision plans and designed and constructed in accordance with this part (with the exception in cases where agreements to the contrary have been executed) will be dedicated to Edgeworth Borough. Landowners shall be responsible for the maintenance of all stormwater control improvements until the development is completed. Thereafter, the landowner shall dedicate these drainage and stormwater control facilities to Edgeworth Borough for maintenance purposes, but only after the landowner has received final approval, provided complete as-built construction drawings, and final inspection and a certificate of compliance from the Municipal Engineer and reviewing body. Notwithstanding anything to the contrary, nothing shall obligate the municipality to accept any facility, and any act of acceptance will always be a matter of the exercise of discretion by Borough Council.