(A) General requirements. No final subdivision/land development plan shall be approved, no permit authorizing construction issued, or any earthmoving or land disturbance activity initiated until the final stormwater management plan for the development site is approved in accordance with the provisions of this chapter.
(B) Exemptions for small developments.
(1) At the time of application, the borough shall determine if the subdivision/land development qualifies as a small development and, therefore, is eligible for a simplified stormwater plan submission. For the purposes of this chapter, a SMALL DEVELOPMENT is any subdivision or land development which results (or will result when fully constructed) in the creation of 5,000 or less square feet of impervious area and one acre or less of any land cover change.
(2) Applications for small developments shall include a plan which describes the type and location of proposed on-site stormwater management techniques or the proposed connection to an existing storm sewer system. The plan should show accurately site boundaries, two-foot interval contours, locations 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. Contingent upon the approval of the Borough Engineer, alternative runoff computational techniques such as the Rational Method may be used where applicable. The borough reserves the right to require that the plan be prepared by a registered professional engineer, surveyor or landscape architect.
(3) The Borough Engineer shall review and approve the proposed provisions for stormwater management in accordance with the standards and requirements of this chapter.
(C) Stormwater plan contents.
(1) General format. The stormwater plan shall be drawn to a scale of not less than one inch equals 200 feet. All sheets shall contain a title block with name and address of applicant and engineer, scale, north arrow, legend and date of preparation.
(2) Existing and proposed features. The plan shall show the following:
(a) Watershed location. Provide a key map showing the location of the development site within the watershed(s) and watershed subarea(s). On all site drawings, show the boundaries of the watershed(s) and subarea(s) as they are located on the development site and identify watershed names(s) and subarea number(s);
(b) Floodplain boundaries. Identify 100-year floodplains on the development site (as appropriate) based on the borough flood insurance study maps;
(c) Natural features. Show all bodies of water (natural or artificial), watercourses (permanent and intermittent), swales, wetlands and other natural drainage courses on the development site, or which will be affected by runoff from the development;
(d) Soils. Provide an overlay showing soil types and boundaries within the development site (consult county, SCS and U.S. geological survey for information);
(e) Contours. Show existing and final contours at intervals of two feet; in areas with slopes greater than 15%, five-foot contour intervals may be used;
(f) Land cover. Show existing and final, land cover classifications as necessary to support and illustrate the runoff calculations performed;
(g) Drainage area delineations. Show the boundaries of the drainage areas employed in the runoff calculations performed; and
(h) Stormwater management controls. Show any existing stormwater management or drainage controls and/or structures, such as sanitary and storm sewers, swales, culverts and the like, which are located on the development site, or which are located off-site but will be affected by runoff from the development.
(3) Professional certification. The stormwater management plan (including all calculations) must be prepared and sealed by a registered professional engineer, surveyor or landscape architect with training and expertise in hydrology and hydraulics. Documentation of qualifications may be required by the borough.
(4) Runoff calculations. Calculations for determining pre- and post-development discharge rates and for designing proposed stormwater control facilities must be submitted with the stormwater management plan. All calculations shall be prepared using the methods and data prescribed by § 153.02.
(5) Stormwater controls. All proposed stormwater runoff control measures must be shown on the plan including methods for collecting, conveying and storing stormwater runoff on-site, which are to be used both during and after construction. Erosion and sedimentation controls shall be shown in accordance with applicable borough and County Conservation District requirements. The plan shall provide information on the exact type, location, siring, design and construction of all proposed facilities and relationship to the existing watershed drainage system.
(a) If the development is to be constructed in stages, the applicant must demonstrate that stormwater facilities will be installed to manage stormwater runoff safely during each stage of development.
(b) A schedule for the installation of all temporary and permanent stormwater control measures and devices shall be submitted.
(c) If appropriate, a justification should be submitted as to why any preferred stormwater management techniques, as listed in § 153.03, are not proposed for use.
(6) Easements, rights-of-way, deed restrictions. All existing and proposed easements and rights-of-way for drainage and/or access to stormwater control facilities shall be shown and the proposed owner identified. Show any areas subject to special deed restrictions relative to or affecting stormwater management on the development site.
(7) Other permits/approvals. A list of any approvals/permits relative to stormwater management required from other governmental agencies (including 25 Pa. Code Chapters 105 and 106) and anticipated dates of submission/receipt should be included with the stormwater plan submission. Copies of permit applications may be requested by the borough where they may be helpful for the plan review.
(8) Maintenance program. The application shall contain a proposed maintenance plan for all stormwater control facilities in accordance with the following:
(a) Identify the proposed ownership entity (e.g., municipality, property owner, private corporation, homeowner’s association or other entity);
(b) Include a maintenance program for all facilities, outlining the type of maintenance activities, probable frequencies, personnel and equipment requirements and estimated annual maintenance costs;
(c) Identify method of financing continuing operation and maintenance if the facility is to be owned by other than the borough or governmental agency; and
(d) Submit any legal agreements required to implement the maintenance program and copies of the maintenance agreement as required by this chapter.
(9) Financial guarantees. Submit financial guarantees in accordance with the provisions of this chapter.
(Ord. 980, passed 3-16-1993; Ord. 991, passed 2-21-1995)