(a) All regulated activities that do not fall under the exemption criteria referenced herein shall submit a SWM Site Plan and report to the municipality for review. These criteria shall apply to the total proposed development even if development is to take place in stages.
(b) The following items shall be included in the SWM Site Plan:
(1) Appropriate sections from the Municipal SALDO and other applicable ordinances shall be followed in preparing the SWM Site Plans. In instances where the Municipality lacks subdivision and land development regulations, the County SALDO shall be followed.
(2) The SWM Site Plan shall provide the following information:
A. Unless specifically given written permission by the Municipality, the following must be shown on the SWM Site Plan, prepared in a form which meets the requirements for recording in the County Office of the Recorder of Deeds:
1. Annotated maps, drawings, engineering plans, and construction details. Said plan shall be prepared by a qualified professional, with said preparer's seal and registration number affixed to the plan. 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: 13 inches x 24 inches, 24 inches x 36 inches, or 36 inches x 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.
2. The name of the proposed development and the name and address of the owner of the property and the individual or firm preparing the plan.
3. Date of submission and revision, graphic scale, and north arrow.
4. Total tract boundary with distances marked to the nearest foot and bearings to the nearest degree and the total acreage of the tract.
5. Key map (drawn to scale) showing all existing natural and man- made features beyond the property boundary affected by the project and the extent of the watershed or sub-basin which drains through the project site.
6. Existing and proposed topographic contours shall be provided at intervals not greater than five feet for existing and proposed conditions.
7. Topographic contours at intervals less than five feet may be required for flat sites, and to depict certain existing and future storm water management features. The reference datum used to develop topographic contours shall be stated on the plans.
8. Existing and proposed use, including the total area of impervious surfaces after construction.
9. Location and selected plant material used for vegetative filter paths to sinkholes, stream buffers, buffer yards, wetlands, streams, and other waters of the Commonwealth, and the location of all notices to be posted, as specified in this chapter. If storm water management facilities are off-site, a note on the plan referring to location and agreements indicating responsibility for conveyance to and maintenance of the facilities; all such off-site facilities shall meet the design standards and criteria specified in this chapter, and details of the facilities shall be included with the plan.
B. An erosion and sediment pollution control plan, as prepared for and submitted to the County Conservation District.
C. Plan and profile, and construction detail drawings of all SWM BMPs including open channels and swales.
D. Locations of existing watercourses (including stream name per PA DEP Chapter 93 designation, or otherwise noted as “unnamed tributary” with Chapter 93 numeric designation) and existing and proposed on-lot wastewater facilities, water supply wells, and infiltration areas.
E. Locations of all access and maintenance easements, suitable for recording.
F. Signature blocks:
The following signature block for the Municipality:
“_________________________ , on this date (date of signature), has reviewed this SWM Site Plan in accordance with the design standards and criteria of the applicable Municipal Ordinances.”
The following signature block for the qualified professional:
“_________________________ on this date (date of signature), hereby certify that this SWM Site Plan was prepared in strict accordance with all of the design standards and criteria of all applicable Municipal Ordinances.”
The following signature block for the applicant/owner:
“______________________on this date (date of signature), has acknowledged that I/we and/or my/our assignees/grantees shall be responsible for maintenance of the storm water management system shown hereon, in accordance with approved storm water management ownership and maintenance plan for this project, and that such storm water system shall remain as a permanent fixture that cannot be altered, replaced, or removed without prior written approval from the Municipality.”
G. A note indicating that a copy of the recorded record drawings will be submitted to the Municipality by the applicant's registered engineer or surveyor for all storm water facilities prior to occupancy, or the release of the surety bond. The Municipality reserves the right to authorize the Municipal Engineer to review said record drawings.
(c) The following items shall be included in the SWM report:
(1) The overall storm water management concept for the project.
(2) A determination of site conditions in accordance with the Appendices attached to Ordinance 2458. A detailed site evaluation shall be completed for projects proposed in areas of carbonate geology or karst topography, and other environmentally sensitive areas such as brownfields.
(3) Storm water runoff design computations and documentation as specified in this chapter, or otherwise necessary to demonstrate that the maximum practicable measures have been taken to meet the requirements of this chapter, including the recommendations and general requirements in Section 1488.09. All calculations shall be submitted to the Municipality on computation sheets for approval. If the Municipality determines through review and independent computation that the size(s) of storm water management facilities is insufficient, the Municipality may require the applicant to increase the size(s) of said storm water management facilities. If the storm drainage system design is completed on a computer installation, sufficient supporting data shall be provided to allow comprehensive review by Municipal officials.
(4) Expected project construction schedule.
(5) The effect of the project (in terms of runoff volumes and peak flows) on adjacent properties and on any existing Municipal storm water collection system that may receive runoff from the project site.
(6) Copies of all permits and applications (where required) by the Pennsylvania Department of Environmental Protection, Pennsylvania Department of Transportation (PA DOT), and U.S. Army Corps of Engineers (USACOE) and other regulatory agencies.
(7) The SWM Site Plan shall include an operation and maintenance (O&M) plan for all existing and proposed physical storm water management facilities. This plan shall address long-term ownership and responsibilities for operation and maintenance as well as schedules and costs for O&M activities.
(8) Hydrologic and hydraulic computations for all existing and proposed storm water management facilities and measures.
(9) Construction specifications for SWM BMPs and storm drainage systems.
(10) Each storm water management report shall contain provisions that clearly set forth the ownership and maintenance responsibility of all permanent storm water management, and erosion and sediment control facilities. Including:
A. Description of maintenance requirements.
B. Establishment of suitable easements for access to all facilities by public officials, in accordance with this chapter.
C. 1. Identification of the responsible party or entity for ownership and maintenance of both temporary and permanent storm water management facilities. In meeting this requirement, the following options are hereby provided for upon approval by the Municipality.
2. Facilities may be incorporated within individual lots so that the respective lot owners will own and be responsible for maintenance in accordance with recorded deed restriction. A description of the facility or system and the terms of the required maintenance shall be incorporated as part of the deed to the property.
3. Ownership and maintenance may be the responsibility of a Property Owners Association. The stated responsibilities of the Property Owners Association in terms of owning and maintaining the storm water management facilities shall be submitted with final plans for determination of their adequacy, and upon their approval shall be recorded with the approved subdivision plan among the County deed records. In addition, the approved subdivision plan and any deed written from said plan for a lot or lots shown herein shall contain a condition that it shall be mandatory for the owner or owners of said lot to be members of said Property Owners Association.
D. For storm water management facilities that are proposed as part of the site development plan, the applicant will be required to execute a developer agreement and a maintenance agreement with the Municipality for the construction and continued maintenance of the facilities prior to the signature approval on the final plan. Access for inspection by the municipality of all such facilities deemed critical to the public welfare at any reasonable time shall be provided.
E. In the event the above priorities cannot be achieved, or where it is required, the facilities may be dedicated to the Municipality in accordance with this chapter. As a condition of Municipality acceptance of said facilities, the applicant shall provide 30% of the cost of improvements, in the form of a maintenance bond, as estimated by the applicant's qualified professional, and approved by the Municipality, to cover contingency maintenance costs for 18 months from the date of storm water management facilities acceptance of dedication. The 30% bond shall be based on the construction costs of the detention basin and outlet structure within the area dedicated to the municipality.
(11) Example Report Sections.
Introduction
Existing Site Conditions
Models
Existing Soils Information
Volume Mitigation
Description And Background Information
Peak Rate Mitigation
Description And Background Information
Pre-Development Conditions
Post-Development Conditions
Storm Water/Detention Basin Hydraulics
Storm Drain Design
Peak-Rate Mitigation Results
Effect of Project on Adjacent Properties
Expected Project Construction Schedule
Ownership and Maintenance
Appendices
Volume Mitigation Calculations, Worksheets And Information
Peak Rate Mitigation Calculations And Information
Water Quality Worksheets And Information
Precipitation Source Data
SCS Runoff Curve Numbers, Rational Runoff Coefficients, Manning's coefficients
Miscellaneous Computations
Infiltration Rate Test Data
General References
Construction Specifications for SWM BMPs
(d) Small Project SWM Application.
(1) Refer to the appendices attached to Ordinance 2458.
(Ord. 2458. Passed 11-15-10.)