The following supplementary studies and plans shall be reviewed in conjunction with the review of preliminary and/or final plans. They shall be determining factors in the acceptance or rejection of the plans and shall include, but not be limited to, the following sections.

The conservation plan shall show the total track and be clearly and legibly drawn to the same size and scale as that of the preliminary and final plans and shall be in the form of an overall plan and shall indicate (or include):

A. Contour lines at vertical intervals of not more than two feet for land with average natural slope of 4% or less and at intervals of not more than five feet for land with average natural slope exceeding 4%.

B. Location and elevation of the bench mark to which contour elevations refer. Where reasonable and practical, datum used shall be USGS from a known, established bench mark. All subdivisions and/or land developments shall have actual field run or aerial topography

C. Location and ownership of all existing watercourses, floodplain areas, wetlands, tree masses, specimen trees and other significant natural or man-made features within the proposed subdivision and within 50 feet from the boundaries of the proposed subdivision.

D. Location and results of soil percolation tests whenever on-site disposal of sewage is planned.

E. Location and type of all erosion and sedimentation control measures, including but not limited to tire cleaners, retention basins, silt fences and hay bales, proposed dates when such measures shall be in effect and supporting data assuring compliance with the erosion and sedimentation control standards set forth in Chapter 131, Erosion and Sedimentation Control. A note shall be added to the plans indicating that the applicant is responsible for installation and maintenance of all soil and erosion control measures until closeout of the escrow account.

F. Notations indicating all trees or portions of tree masses proposed to be cleared as part of the proposed subdivision or development plan, to-ether with reasons for such clearing.

G. Notations indicating all proposed alterations of the natural grade, whether by cut or by fill, exceeding five feet, together with reasons for such alterations. No alterations of grading shall be done within a distance of five feet from an adjoining tract.

H. Chapter 131, Erosion and Sedimentation Control, as amended, is hereby made a part of this chapter and all of its requirements are applicable to any subdivision or land development as defined in this chapter. The applicant shall take whatever measures are necessary to ensure that no silt or mud leaves the property being developed up to dedication and/or closeout of the escrow account. No topsoil shall be removed from the site or used as spoil except upon specific approval of the Board of Supervisors. Topsoil must be removed from the area of construction and stored separately. Upon completion of the grading activities, the topsoil must be redistributed on the site uniformly.

The landscape plan shall show the entire tract, be clearly and legibly drawn to the same size and scale as that of the preliminary and final plan and shall be in the form of an overall plan and shall include:

A. A key map as described in §205-30B(6).

B. Tract boundaries and the zoning classification of all abutting properties.

C. Floodplain areas within and adjacent to the tract.

D. All bodies of water, waterways and drainage swales showing the direction of flow within the tract.

E. All existing tree masses and specimen trees noted and sufficiently labeled.

F. The location and type of all proposed landscaping and/or around cover in buffer areas, common open space and entrances.

G. A full plantings list showing the proper botanical and common name along with the size and grade. A list of suggested plant species will be adopted by resolution by the Board of Supervisors.

[Amended 11-11-2003 by Ord. No. 129-N-03]

A.drainage plan shall be prepared in accordance with Chapter 195 of the East Goshen Township Code. Such drainage plan, which includes a stormwater management plan for the proposed development site, shall be approved as part of the final subdivision or land development approval.

A. (Reserved)

B. The design criteria for the stormwater management facilities shall be determined in accordance with Chapter 195.

C. Storm sewer system.

(1) Storm sewer design shall meet the requirements of PADOT 408 standards.

(2) Storm sewers shall be reinforced concrete when constructed within rights-of-way of streets.

(3) All inlets shall be precast concrete, PADOT type, and the grate sumped two inches.

(4) Inlets shall have a two-inch drop from inlet to outlet.

(5) Storm sewer design shall take into account the time of concentration.

(6) Calculations shall be provided to show the flow in the system, pipe size, allowable flow, actual flow and velocity.

(7) Storm sewers shall have a minimum grade of 0.5% and a minimum inside diameter of 15 inches.

(8) Storm sewers shall have a minimum cover of 12 inches.

(9) Where stormwater or surface water will be gathered within a subdivision or land development and discharged or drained in volume over lands within the boundaries of the subdivision or land development, the subdivider shall reserve easements over the lands affected. The easements shall be adequate for such discharge of drainage and for carrying off of such water and for the maintenance, repair and reconstruction of the same, including the rights of passage over it by vehicles, machinery and other equipment for such purposes. The subdivider shall convey, at no cost, the easements to the Township upon demand.

D. Detention/retention basins. All basins shall be constructed to include, but not be limited to, the following standards:

(1) Berm constructed of earth of a clay base with no topsoil and a shear key continuous along the berm base.

(2) The top of the berm shall be a minimum of 10 feet. The sides shall have a minimum slope of three horizontal to one vertical.

(3) The bottom of the basin shall have a minimum slope of 2% and any channel shall have a minimum slope of 0.5%.

(4) The maximum water depth shall be five feet, and in a retention basin, the minimum permanent water depth shall be three feet.

(5) The top of the basin riser shall be two feet below the top of the berm and one foot below the emergency spillway.

(6) The riser shall be precast concrete, box inlet or equivalent with grate top and shall be built into the berm whenever possible.

(7) The barrel shall be concrete pipe with anti-seep collars spread at a maximum of 15 feet with a minimum projection of two feet beyond the pipe.

(8) Emergency spillway shall be constructed of concrete/grass pavers. Pavers shall extend down both the upstream and downstream berm embankment slopes.

(9) Basin barrel outfall shall have an end wall or flared end section with properly designed riprap or energy dissipators.

(10) The minimum distance between a structure (building) and the stormwater management basin shall be 10 feet.

E. Retention basins shall be provided with a valve for draining the permanent pond.

F. In-ground detention basins may be utilized where practical and shall be constructed to the following standards:

(1) Shall have a perforated pipe distribution system.

(2) Shall have a positive outfall designed to meet the minimum flow allowable for a predevelopment storm.

(3) Shall be completely lined with geotextile fabric.

(4) Stone fill in basin shall be No. 4 stone with a void rating of 45%.

(5) Percolation rate shall not be taken into account when sizing basin.

G. Individual berms or in-ground basins may be used where practical but title plan shall contain a note that facilities are permanent and shall be maintained by the property owner.

H. Landscaping of drainage channels and retention areas. All storm drainage channels and retention/detention areas whether existing or proposed shall be graded and planted to effectively naturalize areas so as to become an integral and harmonious part of the landscape by contour and type of plant material employed.

**Webmasters Note: The previous section has been amended as per Ordinance No. 129-N-03.

[Added 10-3-2000 by Ord. No. 129-J-00]

In addition to the requirements of §205-37, where individual on-lot stormwater management facilities are proposed, the subdivision and/or land development plan shall contain a note in form and content satisfactory to the Township Solicitor designating the responsibility for construction and/or maintenance of the on-lot facilities and, in the event that the responsible person or entity fails to do so, granting to the township the right, but not the duty, to enter upon the premises to repair or restore said facilities, to charge and assess the costs thereof to the owner and to enforce said charges and assessments by lien upon the property. In addition, the deed for each lot shall contain a covenant binding on the grantee and all successors in interest in and to the lot designating the responsibility for construction and/or maintenance of the on-lot facilities. No on-lot storm water facilities approved as part of the final plan shall be removed or altered in any manner by the owner without the expressed written approval of the Board of Supervisors. The following is an example of such a clause:

"UNDER AND SUBJECT, nevertheless, to the following conditions and restrictions: Prior to the construction of a dwelling or any other earthmoving activities, Grantee shall construct the permanent stormwater management facilities as shown on the stormwater management plan filed with the Final Plan, prepared by a professional engineer licensed in the Commonwealth of Pennsylvania, dated-and last revised and approved by the East Goshen Township Board of Supervisors; thereafter, the Grantee, his/her/their heirs, executors, administrators, successors and assigns (the "Owner"), at his/her/their sole cost and expense, shall maintain, repair, restore and replace, as necessary, the said stormwater management facilities on the lot in accordance with said Final Plan, so that the facilities shall at all times continue to operate and function in the same manner and capacity as they were designed. No on-lot storm water facilities approved as part of the Final Plan shall be removed or altered in any manner by the Owner without the express prior written approval of the Board of Supervisors. In the event of the failure of the Owner to comply with these conditions and restrictions, East Goshen Township shall have the right, but not the obligation, to cause the said stormwater management facilities to be maintained, repaired, restored or replaced, as necessary, and the costs thereof shall be assessed to the Owner; said assessment shall also be a charge and may be filed as a lien upon the property herein, which shall remain of record until paid in full. East Goshen Township, before it may exercise this right, shall notify the Owner by certified mail or overnight delivery service with positive tracking, of its intention to take the afore-noted action (the "Notice"). The Notice shall set forth in what manner the Owner has neglected the maintenance, repair,

**Webmasters Note: The following section has been amended as per Supplement No.14.

The following supplementary studies, when required by the township, shall be reviewed in conjunction with the review of the preliminary and/or final plans. They shall be determining factors in the acceptance or rejection of the plans and shall include, but not be limited to, the following studies.

The traffic impact study shall be in conformance with Traffic Access and Impact Studies for Site Development, as prepared by the Transportation Planners Council Task Force on Traffic Access/Impact Studies, Institute of Transportation Engineers, and shall include, but not be limited to, the following:

A. Scope and nature of the entire proposed development.

(1) Acreage of property

(2) Intended use.

(3) Location.

(4) Number of units.

B. Description of proposed access points.

(1) Location.

(2) Grades.

(3) Alignments

(4) Sight distances.

C. Existing conditions and uses of roads and intersections adjacent to the property, accessing the property and in the vicinity of the property.

(1) Right-of-way widths.

(2) Number of travel lanes and parking lanes.

(3) Width of travel lanes.

(4) Shoulder/parking lane widths.

(5) Intersection turning movements for the peak hour of travel.

(6) Average annual daily traffic counts.

(7) Peak hour traffic counts.

D. Calculation of capacity of all approaches to all intersections in the vicinity of the development. It is strongly suggested that the capacity analysis be based on the procedure established in the 1985 Highway Capacity Manual, Special Report 209, Transportation Research Board. This standardized methodology is formulated around the following factors:

(1) Width and marking of approach lanes.

(2) Forking conditions.

(3) One-way and two-way operations.

(4) Load factor.

(5) Area population.

(6) Area land use.

(7) Turning movements.

(8) Truck and bus movements.

(9) Traffic signalization.

E. Estimate of potential peak hour trip generation based on procedures established in the Trip Generation Manual, Institute of Transportation Engineers (ITE), Fourth Edition, 1987, and shall be formulated around the following factors:

(1) Type.

(2) Number of units.

(3) Number of employees.

(4) Type of ingress and egress traffic movement.

F. Distribution of traffic. Assign traffic to particular access points, streets and intersections using marketing studies, work trip (origin - destination data or traffic simulation models). See also Subsection E.

G. Comparison of existing peak hour counts and existing capacities of each intersection.

H. Comparison of existing peak hour count plus traffic generated by the development plus assumed annual increase in traffic and existing capacities of each intersection. See also Subsection E.

I. Description of necessary improvements to accommodate future traffic (if Subsection H shows an unacceptable level of service).

J. Cost estimates.

**Webmasters Note: The following section has been amended as per Supplement No. 14.

K. Implementation strategy. (NOTE: For all capacity analyses, East Goshen shall be considered a residential area for "location within a metropolitan area" and "metropolitan area population" shall be 75,000.)