It shall be unlawful to commence any regulated activity prior to submission and unconditional approval of a stormwater management plan, or conditional approval of a stormwater management plan if proper financial security is to be posted in accordance with § 199-21 under this chapter.
Approval of a stormwater management plan does not exempt or relieve the developer or any builder or owner from any requirements to submit grading plans to the Township prior to issuance of a land use or building permit.
Any regulated activity that meets the following exemption criteria is exempt from the provisions of this chapter. These criteria shall apply to the total project even if the project is to take place in phases. Calculation of square footage for the purposes of an exemption shall be cumulative and shall include the impervious cover existing on the date of application for the exemption. Exemption shall not relieve the applicant from implementing such measures as are necessary to protect health, safety, and property. This exemption shall not relieve the applicant from meeting the requirements for water quality and groundwater recharge or special requirements for high quality (HQ) and exceptional value (EV) watersheds.
Agriculture when operated in accordance with a conservation plan or erosion and sedimentation control plan approved by the Conservation District shall be exempt from the provisions of this chapter. The agricultural activities such as growing crops, rotating crops, tilling of soil and grazing animals and other such activities are specifically exempt from complying with the requirements of this chapter.
Forest management operations, which are following the DEP's management practices, contained in its publication "Soil Erosion and Sedimentation Control Guidelines for Forestry" and are operating under an erosion and sedimentation control plan approved by the Conservation District shall be exempt from the provisions of this chapter.
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 sedimentation control plan by title and date. The cover sheet of the computations and erosion and sedimentation control plan shall refer to the associated maps by title and date. All stormwater management plan materials shall be submitted to the Township in a format that is clear, concise, legible, neat, and well organized; otherwise, the stormwater management plan shall be returned to the applicant as though it were not filed. The following items shall be included in the stormwater management plan:
General description of project.
General description of permanent stormwater management facilities, including construction specifications of the materials to be used for such stormwater management facilities.
Complete hydrologic, hydraulic, and structural computations for all stormwater management facilities.
The stormwater management plan shall be signed and sealed by a licensed professional engineer.
Map(s) of the project area shall be submitted on twenty-four-inch-by-thirty-six-inch or thirty-inch-by-forty-inch sheets. The contents of the maps(s) shall include but not be limited to:
The location of the project relative to highways, municipalities or other identifiable landmarks.
Existing contours at intervals of two feet. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used.
Existing streams, lakes, ponds, or other bodies of water within the project area.
Other physical features including flood hazard boundaries, sinkholes, streams, existing drainage courses, areas of natural vegetation to be preserved, and the total extent of the upstream area draining through the site.
The locations of all existing and proposed utilities, sanitary sewers, and water lines within 50 feet of property lines.
An overlay showing soil names, boundaries and hydrologic soil classification.
Proposed changes to the land surface and vegetative cover, including the type and amount of impervious area that would be added.
Proposed structures, roads, paved areas, and buildings.
Final contours at intervals at two feet. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used; provided, however, that final contours in any area containing stormwater management facilities may not exceed two feet.
The name of the project, the name and address of the developer and owner of the property, and the name of the individual or firm preparing the plan.
The date of submission.
A graphic and written scale of one inch equals no more than 50 feet; for tracts of 20 acres or more, the scale shall be one inch equals no more than 100 feet.
A North arrow.
The total tract boundary and size with distances marked to the nearest foot and bearings to the nearest degree.
Existing and proposed land use(s).
A key map showing all existing man-made features beyond the property boundary that would be affected by the project.
Horizontal and vertical profiles of all open channels, including hydraulic capacity.
Overland drainage paths.
A note on the stormwater management 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.
A statement, signed by the landowner, acknowledging the stormwater management facilities to be permanent fixtures that can be altered or removed only after approval of a revised plan by the Township.
The location of all facilities installed or to be constructed and installed pursuant to an erosion and sedimentation control plan for the project.
The location of all groundwater recharge facilities.
A written description of the following information shall be submitted:
The overall stormwater management concept for the project.
Stormwater runoff computations as specified in this chapter.
Stormwater management techniques to be applied both during and after development.
A summary table showing predevelopment and controlled and uncontrolled postdevelopment discharge rates for all required designed storms.
An erosion and sedimentation control plan, where applicable, including all reviews and approvals, as required by DEP.
A geologic assessment of the effects of runoff on sinkholes as specified in this chapter.
The effect of the project (in terms of runoff volumes and peak flows) on adjacent and downstream properties and on any existing storm sewer that may receive runoff from the project site.
Soil evaluation to justify infiltration site location and results of on-site testing to establish infiltration rates used for design.
Stormwater management facilities.
All stormwater management facilities must be located on a stormwater management plan and described in detail, including:
Groundwater recharge methods such as seepage pits, beds or trenches. The location of the proposed structure, including a detailed cross-section. If these structures are proposed, the locations of septic tank infiltration areas and wells must be shown. Groundwater recharge methods must comply with the additional requirements in Subsection D(2) of this section.
Other control devices or methods, such as rooftop storage, semipervious paving materials, grass swales, parking lot ponding, vegetated strips, detention or retention basins, storm sewer, etc.
Cross-sections of any detention or retention basins showing the relationship between the existing topography and the proposed bottom, spillway, top of embankment and the outlet structure and the corresponding proposed finished grade elevations. A detail of the outlet structure shall be provided, including all pertinent construction requirements.
A schedule for the installation of the stormwater management facilities. In all cases, the stormwater management facilities must be completed prior to the creation of additional impervious surface.
The following additional requirements apply to all proposed groundwater recharge methods such as seepage pits, beds, trenches, leaching wells and cisterns:
Representative percolation tests must be made throughout the area proposed for development. At least one percolation test must be included in each soil group and at least one percolation test must be conducted for each five lots proposed for development. The percolation test must be sampled at the invert depth of the proposed structure.
Seepage pits, beds or trenches shall not be permitted for any development of more than five lots without prior approval of the Township.
All calculations, assumptions, and criteria used in the design of the stormwater management facilities must be shown.
A maintenance program for stormwater management facilities meeting the requirements of this chapter must be included. This program must include the ownership of the stormwater management facilities and detail the financial responsibility for any required maintenance.
For all activities regulated by this chapter, the steps below shall be followed for submission. For any activities that require a joint permit application under Chapter 105 (Dam Safety and Waterway Management) or Chapter 106 (Floodplain Management) of the DEP Rules and Regulations, or require a PennDOT highway occupancy permit, or require any other permit under applicable state or federal regulations, the proof of application for that permit(s) shall be part of the stormwater management plan. The stormwater management plan shall be coordinated with the state and federal permit process.
The stormwater management plan shall be submitted by the developer or owner as part of any regulated activity defined in § 199-5 of this chapter. All applicable fees shall be paid at the time of submission.
The Township Engineer shall review the stormwater management plan for consistency with any adopted watershed-wide stormwater management plans enacted under Act 167. The Township Engineer shall require receipt of a complete plan, as specified in this chapter. The Township shall not approve a stormwater management plan inconsistent with any stormwater management plan under Act 167 applicable to the Township.
Editor's Note: See 32 P.S. § 680.1 et seq.
The Township Engineer shall review the stormwater management plan for any subdivision or land development which contravenes any provisions of Chapter 208, Subdivision and Land Development, not superseded by this chapter. A written review will be provided to the Township outlining the results of the review.
The developer shall be responsible for completing record drawings of all stormwater management facilities included in the approved stormwater management plan. The record drawings and an explanation of any discrepancies with the designed plans shall be submitted to the Township Engineer for final approval. In no case shall the Township approve the record drawings until the Township receives a copy of the PennDOT highway occupancy permit, and any applicable DEP permits.
A modification to a submitted stormwater management plan for a project 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 stormwater management plan as determined by the Township Engineer, shall require a resubmission of the modified stormwater management plan consistent with § 199-10 of this chapter and be subject to review as specified in § 199-11 of this chapter or a modification to a stormwater management plan for which a formal action has not been taken by the Township shall be submitted to the Township consistent with § 199-10 of this chapter and be subject to review as specified in § 199-11 of this chapter.