(a) The SWM site plan shall consist of a general description of the project including sequencing items described in § 1043.15, 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 SWM site plan materials shall be submitted to the municipality in a format that is clear, concise, legible, neat and well organized; otherwise, the SWM site plan shall not be accepted for review and shall be returned to the applicant.
(b) The following items shall be included in the SWM site plan, when applicable:
(1) General.
A. General description of the project, including those areas described in § 1043.15(b);
B. General description of proposed permanent stormwater management techniques, including construction specifications of the materials to be used for stormwater management facilities;
C. Complete hydrologic, hydraulic and structural computations for all stormwater management facilities;
D. An erosion and sediment control plan, including all reviews and letters of adequacy from the Conservation District; and
E. A general description of proposed nonpoint source pollution controls.
(2) Maps. Map(s) of the project area shall be submitted on 24-inch by 36-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 the county. If the SALDO has more stringent criteria than this chapter, then the more stringent criteria shall apply. The contents of the map(s) shall include, but not be limited to:
A. The location of the project relative to highways, municipal boundaries or other identifiable landmarks;
B. Existing contours at intervals of two feet. In areas of steep slopes greater than 15%, five-foot contour intervals may be used;
C. Existing streams, lakes, ponds or other waters of the commonwealth within the project area;
D. 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;
E. The locations of all existing and proposed utilities, sanitary sewers and water lines within 50 feet of property lines;
F. An overlay showing soil names and boundaries;
G. Limits of earth disturbance, including the type and amount of impervious area that would be added
H. Proposed structures, roads, paved areas and buildings;
I. Final contours at intervals of two feet. In areas of steep slopes (greater than 15%), five- foot contour intervals may be used;
J. 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;
K. The date of submission;
L. 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;
M. A north arrow;
N. The total tract boundary and size with distances marked to the nearest foot and bearings to the nearest degree;
O. Existing and proposed land use(s);
P. A key map showing all existing human-made features beyond the property boundary that would be affected by the project;
Q. Location of all open channels;
R. Vertical profiles of all proposed open channels and storm sewers including hydraulic capacity for both;
S. Overland drainage patterns and swales;
T. A 15-foot wide access easement around all stormwater management facilities that would provide ingress to and egress from a public right-of-way;
U. The location of all erosion and sediment control facilities;
V. A note on the plan indicating the location and responsibility for maintenance of stormwater management facilities. All facilities shall meet the performance standards and design criteria specified in this chapter;
W. A statement, signed by the applicant, acknowledging that any revision to the approved SWM site plan must be approved by the municipality, and that a revised erosion and sediment control plan must be submitted to the Conservation District for a determination of adequacy; and
X. The following signature block for the design engineer:
“I, (design engineer), on this date (date of signature), hereby certify that the SWM site plan meets all design standards and criteria of the Aston Township Stormwater Management Ordinance.” [Note: license stamp should be included here] |
(c) Supplemental information to be submitted to the municipality:
(1) A written description of the following information shall be submitted by the applicant and shall include:
A. The overall stormwater management concept for the project designed in accordance with § 1043.15;
B. Stormwater runoff computations as specified in this chapter;
C. Stormwater management techniques to be applied both during and after development;
D. Expected project time schedule;
E. Development stages or project phases, if so proposed; and
F. An operations and maintenance plan in accordance with § 1043.33.
(2) An erosion and sediment control plan;
(3) A description of 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; and
(4) A declaration of adequacy and highway occupancy permit from the Pennsylvania Department of Transportation (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 measures 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, loading ratios (guidelines presented in the PA BMP Manual) and criteria used in the design of the stormwater management facilities must be shown.
(Ord. 928, passed 6-18-2014)