The stormwater management site plan shall consist of all applicable calculations, maps and plans, including simultaneous copies of all plans, reports, and correspondence with the Lancaster County Conservation District. A note on the maps shall refer to the associated computations and erosion and sediment pollution control plan by title and date. The cover sheet of the computations and erosion and sediment pollution control plan shall refer to the associated maps by title and date. All stormwater management site plan materials shall be submitted to the Township in a format that is clear, concise, legible, neat and well organized.
A. Drafting standards. All stormwater management site plans shall be prepared in accordance with the following drafting standards.
(1) The plan shall be clearly and legibly drawn at a horizontal scale of 10 feet, 20 feet, 30 feet, 40 feet, or 50 feet to the inch.
(2) All profiles of stormwater management facilities, streets, sanitary sewer facilities, and water supply facilities shall be drawn at a horizontal scale of one inch equals 50 feet and at a vertical scale of one inch equals 10 feet, or one inch equals five feet.
(3) A north arrow, graphic scale and written scale shall be provided.
(4) Dimensions shall be in feet and decimals; bearings shall be in degrees, minutes and seconds. Lot line descriptions shall read in a clockwise direction.
(5) The survey shall not have an error of closure greater than one foot in 10,000 feet.
(6) The sheet size shall be no smaller than 18 inches by 22 inches and no larger than 24 inches by 36 inches. If the plan is prepared in two or more sections, a key map showing the location of the sections shall be placed on each sheet. If more than one sheet is necessary, each sheet shall be the same size and numbered to show the relationship to the total number of sheets in the plan (e.g. Sheet 1 of 5).
B. Project location and identification. The following location and identification shall be included on all stormwater management site plans:
(1) The proposed project name or identifying title.
(2) Name of the Township or municipalities in which the project is located, including the location of any municipal boundaries if located within 200 feet of the subject tract.
(3) The name and address of the owner of the tract (or his authorized agent), the developer/subdivider, and the firm that prepared the plans.
(4) The file or project number assigned by the firm that prepared the plan, the plan date and the date(s) of all plan revisions.
(5) The entire existing tract boundary with bearing and distances. If it is the intention of the landowner to retain a single lot with a lot area in excess of 10 acres, the boundary of that lot may be identified as a deed-plotting and may be drawn at any legible scale; if the retained lot has a lot area of 10 or less acres, it must be described to the accuracy of the requirements of this chapter.
(6) The total acreage of the entire existing tract.
(7) The location of existing lot line markers along the perimeter of the entire existing tract.
(8) The zoning district, lot size and/or density requirements of Chapter
350, Zoning.
(9) A statement on the plan indicating the granting of a prior zoning amendment, special exception or variance, any prior modifications of Chapter
295, Subdivision and Land Development, of the Code of the Township of Rapho and any prior modifications of sections of this chapter, including any conditions of approval attached to any of the above-mentioned prior approvals.
(10) The names of all adjacent landowners; both adjoining and across existing rights-of-way along with the plan book record numbers of all previously recorded plans for adjacent properties.
(11) A location map, drawn to scale, relating the subdivision or land development to at least two intersections of street center lines, including the approximate distance to the intersection of center lines of the nearest improved street intersection.
(12) Source of title, deed, book, page, plan book (if applicable), and parcel account number.
(13) A note indicating existing and proposed land use(s).
C. Existing features. The following features shall be shown on all stormwater management site plans and shall be shown on a separate sheet titled "Existing Features." No proposed features shall be included on this sheet.
(1) Existing contours shall be shown at the following minimum vertical intervals:
Average Natural Slope | Required Contour Interval |
|---|
0 to 3% | 1 foot contour interval |
4 to 20% | 2 foot contour interval |
21% and greater | 5 foot contour interval |
(a) Contour interval may be adjusted based upon horizontal scale with concurrence of the Township Engineer.
(b) Contours shall be accompanied by the location of the bench mark and a notation indicating the datum used. The datum used by an Authority shall be used in all plans indicating connection to an Authority's public sewer system or public water system.
(c) Contours plotted by interpolation of Lancaster County GIS mapping or LiDAR will only be accepted for areas where there is no new construction or land disturbance proposed by the plan.
(d) Contours plotted by interpolation of the United States Geodetic Survey 7.5 feet mapping will not be accepted.
(2) The following items when located upon or within 200 feet of the tract:
(a) The location and name of existing rights-of-way and cartways for private or public streets, alleys and driveways.
(b) The location and size of the following features and any related right-of-way: sanitary sewer mains, water supply mains, fire hydrants, buildings, and stormwater collection, conveyance and management facilities.
(c) The location and size of existing on-lot sewage systems and wells.
(d) The location of existing rights-of-way and easements for electric, gas and oil transmission lines, and railroads.
(e) Significant environmental or topographic features such as floodplains, wetlands, quarry sites, solid waste disposal areas, historic structures, cemetery or burial sites, archaeological sites, highly erosive soils, or wooded areas.
(f) The soils names and boundaries.
(3) The following items when located within the subject tract:
(a) The size, capacity and condition of the existing stormwater management system and any other facility that may be used to convey storm flows.
(b) The location and size of existing on-lot sewage systems and wells.
(c) The location and use of existing buildings and other man-made features.
(d) Significant environmental or topographic features as identified in the Rapho Township Comprehensive Plan, including, but not limited to:
[1] Prime agricultural soils;
[2] Underlying geology with any hazardous geology noted;
[5] Solid waste disposal areas;
[7] Cemetery or burial sites;
(e) The location of wetlands and supporting data.
D. Proposed features and plan information. The following proposed features and plan information shall be shown on all stormwater management site plans and shall be shown on a separate sheet entitled "Proposed Features." The proposed features and plan information shall be overlaid upon a copy of the existing features plan. The existing features shall be screened or shaded on the proposed features plan.
(1) Block and lot numbers in consecutive order (e.g., Block A, Lots 1 through 10; Block B, Lots 11 through 22).
(2) The location and configuration of proposed buildings, parking compounds, streets, including cartway and right-of-way widths, alleys, driveways, common open space, recreational areas, and all other significant planned facilities.
(3) Total number of lots, units of occupancy, density, and proposed land use. If a multiple land use is proposed, the location of each land use shall be indicated.
(4) Easements and rights-of-way, including.
(a) A minimum twenty-foot wide access easement around all stormwater management facilities that would provide ingress from and egress to a public right-of-way. Easements shall be provided to allow for the collection and discharge of water, the inspection, maintenance, repair and reconstruction of the drainage facilities, and the passage of machinery for work.
(b) Provisions for permanent access or maintenance easements for all existing and proposed physical stormwater management facilities, such as ponds and infiltration structures, as necessary to implement the operation and maintenance (O&M) plan. All such agreements shall be duly recorded in the Office of the Recorder Deeds and shall constitute a binding permanent covenant upon the property, superior to all liens of record and not subordinate to any easement or restriction that would interfere with its provisions and the implementation thereof.
(5) Building setback line and building envelope.
(6) Identification of buildings to be demolished and all other features to be removed.
(7) Typical street cross-section for each proposed public or private street and typical cross-section for any existing street which will be improved as part of the application. Each cross-section shall include the entire right-of-way width.
(8) The following stormwater management data and plans designed in accordance with this chapter shall be included:
(a) All calculations, assumptions, criteria, and references used in the design of the stormwater management facilities, the establishment of existing facilities capacities, and the pre- and post-development discharges.
(b) All plans and profiles of the proposed stormwater management facilities, including the horizontal and vertical location, size, and type of material.
(c) For all basins, a plotting or tabulation of the storage volumes and discharge curves with corresponding water surface elevations, inflow hydrographs, and outflow hydrographs.
(d) The guidelines for lot grading within the subdivisions. This information shall identify the direction of stormwater runoff flow within each lot and the areas where stormwater runoff flows will be concentrated. This information shall be shown by flow arrows or topographical data.
(9) A table indicating the existing zoning district, total tract area, required lot size, required setbacks, required maximum and/or minimum development density, maximum building height, maximum lot coverage, and number of lots in the proposed subdivision along with the proposals for each of these parameters.
(10) A statement identifying the number of square feet of impervious coverage for which stormwater management facilities have been designed for each lot.
(11) A statement on the plan indicating the granting of a zoning amendment, special exception or variance, any modifications of Chapter
295, Subdivision and Land Development, and any modifications of sections of this chapter, including any conditions of approval attached to any of the above-mentioned approvals.
(12) Where the proposed regulated activity is located partially or wholly within an area prone to frequent flooding (either by impoundment or conveyance) as indicated by the flood boundary and floodway map, profiles, and supporting data, soil type or local historical record; the developer shall supply the location and elevation of all proposed roads, fills, utilities, buildings, stormwater management, and erosion control facilities.
(13) Location of all percolation test holes, deep probe holes and proposed well locations.
(14) Easements for the on-lot sewage replacement locations.
(15) The location of all trees and/or woodlands on the site and location of trees and/or woodland to be removed and trees and/or woodlands to remain.
(16) The layout of lots with approximate dimensions, gross and net acreage.
(17) A detailed grading plan. The grading plan shall include finished grades and ground floor elevations. This information may be provided on separate sheets and is not subject to recording with the final plans.
(18) The location of all erosion and sedimentation control facilities.
(19) Identification of any lands to be dedicated or reserved for public, semipublic or community use.
(20) In the case of a plan which requires access to a highway under the jurisdiction of the Department of Transportation, the inclusion of the following plan note:
"A highway occupancy permit is required pursuant to § 420 of the Act of June 1, 1945 (P.L. 1242, No. 428), known as the 'State Highway Law,' before access to a state highway is permitted. Access to the state highway shall be as authorized by a highway occupancy permit, and the Supervisors' approval of this plan in no way implies that such a permit can be acquired."
(21) A complete landscape plan showing the location, size and type of all plant material required by provisions of this chapter or any other applicable Township ordinances, including, but not limited to, all vegetated stormwater BMPs.
(a) The landscape plan shall include the signature and seal of the registered landscape architect responsible for preparation of the plan.
(b) Native or naturalized/noninvasive vegetation suitable to the soil and hydrologic conditions of the development site shall be used unless otherwise specified in the BMP Manual.
(c) The limit of existing, native vegetation to remain shall be delineated on the plan along with proposed construction protection measures.
(22) A detailed schedule of observations during and following construction, as generally outlined as follows, which is tailored for the site under consideration.
(a) The detailed construction and post-construction observation schedule shall be developed by the professional responsible for the preparation of the stormwater management site plan.
(b) The detailed construction and post-construction observation schedule shall be submitted to the Township for review and approval during the preparation of the stormwater management site plan.
(c) The construction and post-construction observation schedule shall be shown on the approved stormwater management site plan.
(d) The developer shall provide at least 24 hours' notice prior to the start of construction of any improvements that are subject to observation.
(e) All observations of completed items shall be requested, in writing, at least 48 hours in advance of the observation time and date.
(f) The developer shall be responsible for the cost of all observations.
(g) The Township shall observe all phases of the installation of any temporary or permanent stormwater management facilities during construction.
(h) It is generally required that the following phases of site construction have mandatory observation.
(i) General site construction.
[1] Upon completion of preliminary site preparation, including stripping of vegetation, stockpiling of topsoil and construction of temporary erosion and sedimentation control devices.
[2] Upon completion of rough grading, but prior to placing topsoil, permanent drainage, or other site development improvements and ground covers.
[3] During the construction of permanent stormwater management and BMP facilities.
[4] Upon the final completion of permanent stormwater management and BMP facilities, including the establishment of ground covers and plantings.
[5] After review of the as-built drawings, required by Article
VII, Administration, but prior to final release of the financial security for completion of final grading, vegetative controls required by the BMP standards, or other site restoration work.
(j) In addition to the above-outlined observations, additional observations will be made at the request of the developer for reduction of financial securities. Random observations should be made at the frequency desired by the Township. At the time of any of the above-listed observations, all ongoing construction (i.e., storm drainage, sanitary sewer, water, erosion control, etc.) should also be checked for compliance with the approved plans and the findings reported. Since the above observations are mandatory, it is recommended that requests for reduction of financial security be submitted to coincide with the above observations.
(23) A note indicating that as-built plans will be provided for all stormwater management facilities prior to occupancy or the release of financial security.