§ 53.087 STORMWATER PLAN CONTENTS.

   (A)   General format. The stormwater plan shall be drawn to a scale of not less than one inch equals 100 feet. All sheets shall contain a title block with name and address of applicant and engineer, scale, north arrow, legend and date of preparation.

   (B)   Existing and proposed features. The plan shall show the following under both pre-development and post-development conditions:

      (1)   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);

      (2)   Floodplain boundaries: identify 100-year floodplains on the development site (as appropriate) based on the municipal flood insurance study maps;

      (3)   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 form the development;

      (4)   Soils: provide an overlay showing soil types and boundaries within the development site (consult county, SCS and U.S. Geological Survey for information);

      (5)   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;

      (6)   Land cover: show existing and final land cover classifications as necessary to support and illustrate the runoff calculations performed;

      (7)   Drainage area delineations: show the boundaries of the drainage areas employed in the runoff calculations performed; and

      (8)   Stormwater management controls: show any existing stormwater management or drainage controls and/or structures, such as 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.

   (C)   Professional certification. The principal in charge of preparing the stormwater management plan (including all calculations) shall be a registered professional engineer or registered land surveyor and the stormwater management plan shall be sealed by a registered professional engineer or professional land surveyor with training and expertise in hydrology and hydraulics. Documentation of qualifications may be required by the municipality.

   (D)   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 § 53.026.

   (E)   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.

      (1)   Erosion and sedimentation controls shall be shown in accordance with § 53.006. The plan shall provide information on the exact type, location, sizing, design and construction of all proposed facilities and their relationship to the existing watershed drainage system.

      (2)   The plan shall include technical specifications for materials and methods to be used in the construction of the stormwater management facilities.

         (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 §§ 53.040 through 53.042 and §§ 53.055 through 53.059, are not proposed for use.

   (F)   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 along with any areas subject to special deed restrictions relative to or affecting stormwater management on the development site.

   (G)   Other permits/approvals. A list of any approvals/permits relative to stormwater management that will be required from other governmental agencies (25 Pa. Code Chapters 105 and 106 permits and/or NPDES permit) and anticipated dates of submission/receipt should be included with the stormwater plan submission. Copies of permit applications may be requested by the municipality where they may be helpful for the plan review.

   (H)   Maintenance program. The proposed maintenance plan for all stormwater control facilities shall:

      (1)   Identify the proposed ownership entity (e.g., municipality, property owner, private corporation, homeowner’s association or other entity);

      (2)   Identify the type of maintenance, probable frequencies, personnel and equipment requirements and estimated annual maintenance costs;

      (3)   Identify the method for financing the continuing operation and maintenance of the facility if the facility is to be owned by other than a governmental agency; and

      (4)   Include copies of any legal agreements required to implement the maintenance program and, if applicable, copies of the maintenance agreement as required by §§ 53.070 through 53.072.

   (I)   Financial guarantees. Submit financial guarantees in accordance with the provisions of §§ 53.008 and 53.009.

(Ord. 4-2011, passed 10-8-2011)