The drainage plan shall consist of a general description of the project including sequencing items described in § 505-124, calculations, maps and plans. A note on the maps shall refer to the associated computations and erosion and sediment control plan by title and date. The cover sheet of the computations and erosion and sediment control plan shall refer to the associated maps by title and date. All drainage plan materials shall be submitted to the municipality in a format that is clear, concise, legible, neat, and well organized; otherwise, the drainage plan shall not be accepted for review and shall be returned to the applicant. The following items shall be included in the drainage plan:
A. General.
(1) General description of the project including those areas described in § 505-124.
(2) General description of permanent stormwater management techniques, including construction specifications of the materials to be used for stormwater management facilities.
(3) Complete hydrologic, hydraulic, and structural computations for all stormwater management facilities.
(4) An erosion and sediment control plan, including all reviews and approvals by the Conservation District.
(5) A general description of nonpoint source pollution controls.
B. Maps. Map(s) of the project area shall be submitted on twenty-four-inch-by-thirty-six-inch sheets and/or shall be prepared in a form that meets the requirements for recording at the offices of the Recorder of Deeds of Berks County. If Chapter 515, Subdivision and Land Development (SALDO), has more stringent criteria, then the more stringent criteria shall apply. The contents of the map(s) shall include, but not be limited to:
(1) The location of the project relative to highways, municipalities or other identifiable landmarks.
(2) Existing contours at intervals of two feet. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used.
(3) Existing streams, lakes, ponds or other waters of the commonwealth within the project area.
(4) Other physical features including flood hazard boundaries, stream buffers, existing drainage courses, areas of natural vegetation to be preserved, and the total extent of the upstream area draining through the site.
(5) The locations of all existing and proposed utilities, sanitary sewers, and water lines within 50 feet of property lines.
(6) An overlay showing soil names and boundaries.
(7) Limits of earth disturbance, including the type and amount of impervious area that would be added.
(8) Proposed structures, roads, paved areas, and buildings.
(9) Final contours at intervals of two feet. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used. The Municipal Engineer may require contours at less than the above based upon site-specific conditions.
(10) The name of the development, the name and address of the owner of the property, and the name of the individual or firm preparing the plan.
(11) The date of submission.
(12) 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.
(13) A North arrow.
(14) The total tract boundary and size with distances marked to the nearest foot and bearings to the nearest degree.
(15) Existing and proposed land use(s).
(16) A key map showing all existing man-made features beyond the property boundary that would be affected by the project.
(17) Location of all open channels.
(18) Overland drainage patterns and swales.
(19) A minimum fifteen-foot wide access easement surrounding all sides of all stormwater management facilities that would provide ingress to and egress from a public right- of-way.
(20) The location of all erosion and sediment control facilities.
(21) A note on the plan indicating the location and responsibility for maintenance of stormwater management facilities that would be located on/off-site. All on/off-site facilities shall meet the performance standards and design criteria specified in this Part.
(22) A statement, signed by the landowner, acknowledging that any revision to the approved drainage plan must be approved by the municipality and the Conservation District.
(23) The following signature block for the design engineer:
"I, (Design Engineer), on this date (date of signature), hereby certify that the drainage plan meets all design standards and criteria of the applicable (Schuylkill River or Tulpehocken Creek) Watershed Act 167 Stormwater Management Ordinance."
C. Supplemental information.
(1) A written description of the following information shall be submitted:
(a) The overall stormwater management concept for the project designed in accordance with § 505-124.
(b) Stormwater runoff computations as specified in this Part.
(c) Stormwater management techniques to be applied both during and after development.
(d) Expected project time schedule.
(e) Development stages (project phases) if so proposed.
(f) An operation and maintenance plan in accordance with § 505-172 of this Part.
(2) An erosion and sediment control plan.
(3) The effect of the project (in terms of runoff volumes and peak flows) on adjacent properties and on any existing municipal stormwater collection system that may receive runoff from the project site.
(4) A declaration of adequacy and highway occupancy permit from the PennDOT District Office when utilization of a PennDOT storm drainage system is proposed.
D. Stormwater management facilities.
(1) All stormwater management facilities must be located on a plan and described in detail.
(2) When infiltration facilities such as seepage pits, beds or trenches are used, the locations of existing and proposed septic tank infiltration areas and wells must be shown.
(3) All calculations, assumptions, and criteria used in the design of the stormwater management facilities must be shown.