[Ord. 2001-3, 12/10/2001, § 901]
Any application for approval of a subdivision or land development
shall conform to the standards set forth in this Part. The standards
specified in this Part are minimum design requirements.
[Ord. 2001-3, 12/10/2001, § 902]
In reviewing any application for approval of a subdivision or
land development, Township Supervisors shall refer the application
for development to the Township Engineer for a recommendation concerning
technical compliance with these design standards and the Township
construction standards.
[Ord. 2001-3, 12/10/2001, § 903]
1.
Grading, Filling, Removal of Topsoil, Erosion and Sedimentation Control. All grading, filling, removal of topsoil and erosion and sedimentation control shall be performed in accordance with the requirements of Chapter 9 of the Code of Ordinances of the Township (Grading and Excavating) and the requirements of the Pennsylvania Clean Streams Law and Ordinance 102 of the Rules and Regulations of the Pennsylvania Department of Environmental Protection governing erosion control.
2.
Planting and Cutting of Trees; Removal of Debris.
A.
Large shade trees shall be adequately protected from injury and preserved
to the extent practical.
B.
All lot areas which slope towards streets or adjacent lots shall
be required to be seeded with grass or planted with ground cover so
as to prevent washing and erosion.
C.
During construction, the developer shall remove and dispose of all
uprooted trees, stumps, brush, rubbish, unused building materials
and debris promptly in the interest of public safety.
3.
Flood Prone Areas. Land identified as flood prone on maps issued by the Federal Insurance Administration shall be subject to the regulations of the National Flood Insurance Program and shall comply with the provisions of the Township Flood Plain Ordinance (Chapter 8 of the Code of Ordinances of the Township).
[Ord. 2001-3, 12/10/2001, § 904]
1.
Layout.
A.
Streets shall be planned to conform with the layout of existing and
planned streets and so located as to allow proper development of surrounding
properties. Local streets shall be laid out so as to discourage through
traffic. Collector streets shall be designed to provide adequate flow
of traffic from local streets to major community facilities and to
arterial streets.
B.
Intersections of more than two streets at one point shall not be
permitted. Dead end streets shall not be permitted, unless the requirements
of subsections 904(5) or 904(6) are met. Half streets shall not be
permitted.
2.
Topography. Proposed streets shall be planned to conform to the contour
of the land, to the fullest extent possible to provide buildable lots,
to have a suitable alignment and grade and to allow proper drainage.
3.
Street Grades. Minimum and maximum grades shall be provided on all
streets in accordance with the design standards specified in Appendix
II. Grades shall be measured along the centerline of the street. Vertical
curves shall be used in changes of grade exceeding one percent and
shall be designed in accordance with the design standards specified
in Appendix II. Intersections shall be approached on all sides by
leveling grades for a distance of 50 feet within which no grades shall
exceed the design standards specified in Appendix II. The grade of
actual intersections shall not exceed six percent in any direction.
4.
Right-Of-Way and Paving Widths; Curbs; Shoulders.
A.
Minimum widths of rights-of-way and minimum widths of paving shall
be provided in accordance with the design standards specified in Appendix
II. All streets shall be paved in accordance with the Township construction
standards.
B.
Curbs shall be provided on all streets in accordance with the design
standards specified in Appendix II and the Township construction standards.
C.
Street shoulders shall be constructed which are uniformly and thoroughly
compacted by rolling and which are level with the tops of curbs.
5.
Cul-De-Sacs.
A.
A cul-de-sac street shall not be approved when a through street is practical and shall not be more than 800 feet in length, unless an intermediate turnaround is provided at a distance of every 800 feet and a modification or exception to the maximum 800 foot length of cul-de-sac is granted in accordance with the requirements of Part 10 of this Chapter. The length of a cul-de-sac street shall be measured from the point of intersection of the centerlines of the two intersecting streets to the back of the curb of the cul-de-sac turnaround.
B.
A cul-de-sac shall have a minimum right-of-way radius and an outer
minimum paving radius as specified in the design standards in Appendix
II. The maximum grade of the turnaround portion of the cul-de-sac
shall be five percent.
6.
Temporary Turnarounds. A temporary turnaround may be required where
a road is constructed to an adjoining property line or where the terminus
of a road adjoins property in a future phase of the plan. The temporary
turnaround may be a crushed aggregate surface. The right-of-way width
required for a temporary turnaround shall be a minimum of 100 feet
and the paving radius of the temporary turnaround shall be 40 feet,
exclusive of the required curb.
7.
Visibility.
A.
No fence, hedges, shrubbery, walls, planting (other than trees and grass) or similar obstructions shall be located within the right-of-way and no such obstruction shall obscure visibility at any intersection. The location of fences and walls shall be further subject to the requirements of the Township Zoning Ordinance [Chapter 27].
B.
A clear sight triangle, as defined by this Chapter, shall be maintained
free of any obstructions at intersections so that there shall be a
minimum clear sight triangle measured along the centerline from the
points of intersection in accordance with the requirements specified
in Appendix I. The clear sight triangle shall be shown on the final
plat for recording.
8.
Street Names. All new street names shall be approved by the Township
and the Post Office. Names of new streets shall be sufficiently different
in sound and spelling from existing names of streets in the Township
or in the 911 service area so as not to cause confusion. A street
which is planned as a continuation of an existing street shall bear
the same name. Street signs shall be provided in accordance with § 806
of this Chapter.
9.
Sidewalks. The width of sidewalks shall conform to the standards
specified in Appendix II. Sidewalks shall be located in line with
existing sidewalks on adjacent lots or, where none exists, shall be
located a minimum of two feet from the edge of any curb or paving
where practical. The grade and paving of the sidewalk shall be continuous
across driveways. Concrete sidewalks shall be four inches reinforced,
except at driveway crossings where the thickness shall be increased
to six inches and be reinforced with six inches by six inches mesh —
no. 9 gauge. All sidewalks shall be constructed in accordance with
the Township construction standards.
10.
Crosswalks. Crosswalks may be required wherever necessary to facilitate
pedestrian circulation and to give access to community facilities
such as parks, playgrounds, schools or public buildings.
[Ord. 2001-3, 12/10/2001, § 905]
Service streets, as defined by this Chapter, may be permitted
in commercial and industrial developments where needed for loading,
unloading or secondary access. Service streets shall be constructed
in accordance with Township construction standards and shall meet
the minimum design standards shown in Appendix II for local streets,
except that the minimum right-of-way width may be reduced to 30 feet
and the minimum cartway width may be reduced to 20 feet.
[Ord. 2001-3, 12/10/2001, § 906
Easements for sanitary sewers, water lines and stormwater management
facilities shall be required to have a minimum width of 20 feet. Where
a subdivision or land development is, or will be, traversed by a watercourse,
there shall be provided a stormwater easement or drainage right-of-way
of a width sufficient for the purpose, but not less than 20 feet.]
[Ord. 2001-3, 12/10/2001, § 907]
The following standards shall apply to all lots proposed to
be subdivided or developed in accordance with this Chapter.
A.
Area. Minimum lot areas shall conform to the requirements of the Township Zoning Ordinance [Chapter 27]. When a tract is subdivided into lots that are larger than the minimum lot area required by the Zoning Ordinance [Chapter 27], such lots or parcels shall be arranged as to permit a logical location and opening of future streets and resubdividing with provisions for adequate utility connections for each subdivision.
B.
Frontage. All lots created by a subdivision shall have frontage along the right-of-way of a public street and the width of the frontage shall conform to the requirements of the Township Zoning Ordinance [Chapter 27]. Every lot shall be accessible to emergency service, public safety and firefighting vehicles and equipment.
C.
Double Frontage. Double frontage lots shall be avoided; however,
where a double frontage lot is the only practical alternative, vehicular
access shall be limited to only one street and that street shall be
the street with the lower volume of traffic, if physically feasible.
The final plan shall contain a notation restricting vehicular access
to one street frontage.
D.
Side Lines. Whenever practical, the side lines of a lot shall be
at right angles or radial to the right-of-way lines of streets.
E.
Front Building Lines. Front building lines of lots shall conform to the minimum requirements of the Township Zoning Ordinance [Chapter 27] and shall be shown on the final plat.
F.
Grading of Lots. Lots shall be graded to provide drainage away from buildings and water shall be drained to the street, rather than to adjoining property. The developer shall be required to provide drains or other drainage facilities, as approved by the Township Engineer, to drain off surface water within the development. All grading shall comply with the requirements of Chapter 9 of the Code of Ordinances of the Township (Grading and Excavating).
G.
Driveways.
(1)
No driveway shall have a slope of more than 12 percent. Driveways
may extend from the right-of-way line of the street to the cartway
of the street, but shall not change the grade or contour of the street
right-of-way nor shall any person, cut into, fill, or in any way alter
any gutter, inlet, curbing, drainage ditch or storm sewer, within
the right-of-way of a street or easement for the purpose of extending
a driveway; or for any other purpose without first obtaining a permit
therefore from the Township. All curb cuts shall conform to Township
specifications. Paved driveways shall have a joint at the public street
right-of-way. Driveways shall not be constructed in such a way that
creates a drainage problem on adjoining property. No driveway shall
be placed in the same location as, or where it will interfere with
a storm water inlet of catch basin.
(2)
Driveways intersecting Township roads shall have an improved
surface with a minimum thickness of four inches bituminous concrete
or six inches cement concrete. This paving shall extend for a distance
of 10 feet from the edge of the Township road onto the property served
by the driveway. Driveways intersecting State roads shall be constructed
in accordance with the Pennsylvania Department of Transportation Design
Manual, Part 2, Ordinance 18.
(3)
Driveways which are shared among two or more lots shall have
a minimum width of 12 feet. Common driveways shall be within a recorded
easement at least 15 feet in width and shall be subject to a recorded
agreement for maintenance which is noted on the plat and referenced
in the deeds for each lot the driveway serves.
H.
Accessibility. Every lot, building and structure shall be accessible
to emergency and public safety vehicles.
I.
House Numbers. House numbers shall be assigned by the developer,
subject to the approval of the U.S. Postal Service, the regional 911
emergency service and the Township. House numbers shall be posted
at each house so as to be readable from the street and shall be comprised
of Arabic numerals at least three inches high and with a minimum width
stroke of 1/2 inch.
[Ord. 2001-3, 12/10/2001, § 908]
1.
Stormwater management facilities shall be provided for subdivisions
and land developments and shall be designed to ensure that the maximum
rate of stormwater runoff from the site shall be no greater after
development than is the rate of runoff from the site prior to development.
2.
Design Calculations and Reports.
A.
Stormwater runoff and design calculations shall be submitted to the
Township Engineer for review and approval with the application for
combined preliminary and final approval of a land development plan.
Cross sections and specifications showing complete construction details
shall be submitted with the application for final approval.
B.
The stormwater runoff and design calculations shall be prepared by
a Pennsylvania registered professional engineer with qualifications
and experience in preparing stormwater management plans.
C.
Additional analysis, calculations and design criteria shall be required
for both onsite and offsite stormwater systems where it has been determined
by the Township Engineer that further study is necessary.
D.
Stormwater runoff calculations shall be provided for: the outlet
and inlet sides of all stormwater drainage and storage facilities
and structures; at points in a public street with a change of grade;
or where water from a proposed structure, facility or vehicular way
is to enter an existing public street, existing storm sewer, existing
drainage ditch or existing stormwater storage facility. Retention
ponds shall be designed in accordance with the Township construction
standards.
3.
Exemptions for Small Developments.
A.
At the time of application, the Township Engineer shall determine
if the development qualifies as a "small development" and, therefore,
is eligible for a simplified stormwater plan submission. For the purposes
of this Chapter, a small development is: any development which results
(or will result when fully constructed) in the creation of 5,000 square
feet or less of impervious surface area.
B.
A small development shall be exempt from the preparation of a stormwater
management plan as required by subsection (4), below. However, such
developments shall provide safe management of stormwater management
in accordance with the performance standards of this Chapter and as
approved by the Township Engineer.
C.
Applications for small developments shall include a plan which describes,
narratively and graphically, the type and location of proposed onsite
stormwater management techniques or the proposed connection to an
existing storm sewer system. The plan shall be prepared by a registered
professional engineer.
D.
The Township Engineer shall review and approve the proposed provisions
for stormwater management for small developments. Where the applicant
is proposing to connect to an existing storm sewer, the applicant's
engineer shall determine that sufficient capacity exists in the storm
sewer from the point of connection to the point of outlet in the natural
drainage system. The applicant's engineer shall also determine
if the proposed development site is part of a larger parcel or tract
which was subject to any specific stormwater management controls contained
in a prior plan.
E.
For a parcel or tract of land held in single ownership, only one
application for a small development, as defined above, shall be permitted
before requiring a stormwater management plan for the entire parcel.
4.
Stormwater Plan Content. The stormwater management plan for all developments except small developments, as defined in subsection (3), shall consist of the following three components:
A.
Narrative Report. The narrative report shall consist of a general
statement of the project giving the purpose and engineering assumptions
and calculations for control measures and facilities. The following
information shall be included.
(1)
General description of the project.
(2)
General description of accelerated runoff control plan.
(3)
General description of erosion and sedimentation control plan.
(4)
Expected project time schedule, including anticipated start
and completion dates.
(5)
Location and watershed characteristics.
(6)
Hydraulic and hydrologic calculations, methodology and basis
of design.
(7)
Brief soils and description.
B.
Preliminary Plan. The preliminary plan shall provide, and be accompanied
by, maps and other descriptive material indicating the feasibility
of the plan and showing the following.
(1)
A key map showing the development site's location within
the designated watershed and watershed subsheds (consult watershed
stormwater plans for boundaries). On all site drawings, show the boundaries
of the watershed(s) and subarea(s) as they are located on the development
site and identify the watershed names and/or subshed numbers.
(2)
Location of the 100 year floodplain on the development site
based on the Smith Township Flood Insurance Study maps or a determination
by the applicant's engineer.
(3)
An overlay showing soil types and boundaries within the development
site.
(4)
The streets, storm sewers and other storm drains to be built,
the basis of their design, the outfall and outlet locations and elevations,
the receiving stream or channel and its high water elevation and the
functioning of the drains during high water conditions.
(5)
The parts of the proposed parking area pavements, if any, which
are planned to be depressed to provide stormwater storage or conveyance.
A maximum of six inches depth of water may be ponded in a proposed
parking area.
(6)
Existing streams and watercourses to be maintained and new channels
to be constructed, their locations, cross-sections and profiles.
(7)
Proposed culverts and bridges to be built, if any, their materials,
elevations, waterway openings and basis of design.
(8)
Existing detention ponds and basins to be maintained, enlarged
or otherwise altered and new ponds or basins to be built and the basis
of their design.
(9)
The approximate location and percentage of the total land area
in the development which will be covered by impervious surfaces after
construction is completed.
(10)
The slope, type and size of all proposed and existing storm
sewers and other waterways.
(11)
Existing contours at intervals of two feet except in areas with
slopes greater than 10 percent in which case five foot contour intervals
may be used.
(12)
All natural features, including bodies of water (natural and
artificial), watercourses (permanent and intermittent), swales, wetlands
and other natural drainage courses on the development site and those
offsite which will be affected by runoff from the development.
(13)
Approximate depth, shape, size and storage of any proposed retention
facility.
(14)
One or more typical cross-sections of all existing and proposed
channels or other open drainage facilities, showing the elevation
of the existing land and the proposed changes thereto, together with
the high water elevations expected from the 100 year storm under the
controlled conditions called for by this Chapter and the relationship
of structures, streets and other utilities.
(15)
A site plan showing the property lines, dimensions of the site
and location of existing and proposed structures, sewers, waterlines,
easements and rights-of-way.
(16)
Certification of the registered professional engineer responsible
for preparation of the plan.
(17)
A list of the permits and approvals relative to stormwater management
that will be required from other governmental agencies and anticipated
dates of submission and receipt. Copies of the applications may be
requested by the Township Engineer where they may be helpful for the
stormwater plan review.
C.
Final Plan. Upon approval of the preliminary plan, the final plan
shall be submitted to the Township. The final plan shall provide all
descriptive material and maps previously submitted and required prior
to the final plan, in addition to the following items.
(1)
All calculations, assumptions and criteria used in the design
of the storm sewer system, detention facilities and sediment and erosion
control operations. Hydraulic and energy grade lines shall be provided
for proposed storm sewers.
(2)
All plans and profiles of proposed storm sewers and open channels,
including horizontal and vertical controls, elevations, sizes, slopes
and materials.
(3)
Locations, dimensions and design details required for the construction
of all facilities.
(4)
For all detention basins, a plot or tabulation of storage volumes
with corresponding water surface elevations and basin outflow rates
for those water surface elevations.
(5)
For all detention basins, design hydrographs of inflow and outflow
for the peak design flows from the site under natural and developed
conditions.
(6)
A description of operation for all detention basins.
(7)
Contours of the finished project site at intervals of two feet,
except in areas with slopes greater than 10 percent, in which case,
five foot contour intervals may be used.
(8)
The staging of earthmoving activities and program of operation,
including a schedule for the installation of all temporary and permanent
stormwater control measures and devices.
(9)
All information relative to the design and operation of emergency
spillways.
(10)
Emergency routing of outfall for stormwater runoff in the event
of failure of offsite drainage structures.
(11)
When major control facilities, such as retention basins, requiring
a PA DEP permit, are planned, soil structures and characteristics
shall be investigated. Plans and data prepared by a licensed professional
engineer or geologist with experience and education in soil mechanics
shall be submitted. These submissions should consider and offer design
solutions for frost heave potential, shrink/swell potential, soil
bearing strength, water infiltration, soil setting characteristics,
fill and backfilling procedures and soil treatment techniques as required
to protect the improvements or structures.
(12)
All erosion and sedimentation control measures, temporary, as
well as permanent, in sufficient detail to clearly indicate the effectiveness
of the plan.
(13)
Project specifications relative to stormwater control, erosion
and sedimentation.
(14)
Retention ponds shall be seeded inside and outside and shall
be maintained in accordance with Township property maintenance codes.
D.
Maintenance Plan. A maintenance plan establishing ownership and maintenance
responsibilities for all stormwater control facilities (identifying
the specific person or entity responsible) and detailing financial
requirements and sources of funding shall be submitted with the final
plan. Any legal agreements or covenants required to implement the
maintenance program shall be submitted. A maintenance schedule shall
be submitted in accordance with the standardized maintenance schedule
in Appendix III.
5.
General Standards. The following provisions shall be considered the
over-riding performance standards against which all proposed stormwater
control measures shall be evaluated.
A.
Any landowner and any person engaged in the alteration or development
of land which may affect stormwater runoff characteristics shall implement
such measures as are reasonably necessary to prevent injury to health,
safety and other property. Such measures shall include, but not be
limited to, such actions as are required to:
B.
Design Storms.
(1)
Stormwater management facilities within a development shall
be designed to handle the peak rate of runoff from two year, five
year, 10 year, 25 year and 100 year frequency storm events. Whenever
the provisions of Federal or State law impose a greater design storm
frequency, as for example, where drainage systems cross highways,
the stricter standards shall prevail.
(2)
All stormwater retention/detention facilities shall be designed
with emergency overflow facilities for the 100 year, 24 hour duration
storm.
(3)
The stormwater volume required for all stormwater retention/detention
facilities shall be that volume necessary to handle runoff of a 100
year storm in any development, less that volume discharged during
the same storm period used to calculate the volume of rainfall, at
the approved release rate.
(4)
The SCS, Type II Rainfall Distribution shall be used for all
analyses. The design storm frequencies for the watershed are:
|
Design Storm
|
Rainfall Depth 24 Hours
| |
|---|---|---|
|
2 year
|
2.6 inches
| |
|
5 year
|
3.3 inches
| |
|
10 year
|
3.8 inches
| |
|
25 year
|
4.4 inches
| |
|
100 year
|
5.0 inches
|
C.
The stormwater management plan shall consider all of the stormwater
runoff flowing over the project site. Runoff calculations shall be
made to insure that runoff from the fully developed upstream watershed
area (based on the Township's comprehensive land use plan) can
be accommodated by the pipes, drainage easements and watercourses,
etc. on the site.
D.
Joint Development of Control Systems. Stormwater control systems
may be planned and constructed in coordination with two or more developments,
provided they are in compliance with the applicable provisions of
this Chapter.
E.
Method of Computation.
(1)
All computations used in conjunction with the analysis and design
of stormwater management facilities shall be based on one or more
of the following methods:
(3)
These methods of runoff computation developed and used by the
Soil Conservation Service and other authorities are hereby adopted
by the Township.
(4)
The use of the Basic Rational Method in estimating runoff may
be employed in the design of the storm sewer system within the development.
The storm sewer system shall be interpreted as the conduits, culverts,
inlets and appurtenant features for the conveying of stormwater to,
through or from a development site to the point of final discharge
or control facility. The Rational Method shall not be used in the
analysis of stormwater runoff from the development in its entirety
or in conjunction with the design of any retention/detention facilities
or other runoff control measures.
F.
Release of Detained Stormwater. The approved peak release rate of
stormwater from all retention/detention facilities for any storm event
shall be that which is experienced prior to development for the same
storm event up to and including the 100 year storm. Therefore, all
retention/detention facilities shall provide staged release of the
two, five, 10, 25 and 100 year storms.
G.
Design of stormwater management facilities outlined in the plan requires
that runoff calculations be made for the site and areas which contribute
drainage to the site. These calculations should be based on land use,
time of concentration and other standard aspects of hydraulic analysis.
(1)
Temporary Control Measures/Facilities. Runoff calculations of
the site's condition during development will be used to size
temporary control measures.
(2)
Permanent Control Measures/Facilities. In most cases, permanent
control measures/facilities shall be designed to assure that the maximum
rate of stormwater runoff is no greater after development than prior
to development activities, utilizing the 100 year storm as a basis
for calculations.
H.
Runoff calculations shall also include complete hydrology and hydraulic
analysis of all erosion control facilities including, but not limited
to:
I.
Single Family Lots.
(1)
On lots of one acre or less retention facilities shall be constructed
for any proposed single family lot developments or single family lots
located in a subdivision or land development which for terrain reasons
cannot utilize the subdivision or land development's retention
systems. Retention facilities shall consist of ponds, tanks or other
approved facilities, sized in accordance with standard details in
the Township construction standards.
(2)
All stormwater retention facilities shall be located at least
10 feet from foundation walls in a location approved by the Township
building inspector. All pipe from roof drains to a point 10 feet from
the structure shall be a minimum Schedule 40 PVC pipe or approved
equal.
6.
Construction Criteria for Stormwater Control Facilities. Stormwater
management facilities shall be constructed in accordance with the
following minimum specifications:
A.
All workmanship and materials shall conform to the Township construction
standards. In addition, all workmanship and materials shall conform
to the latest edition of Penn DOT Form 408.
B.
All connections to existing storm sewer pipes shall be made by construction
of a suitable junction box (inlet or manhole) to provide access for
clean-out. No blind connections shall be permitted.
C.
All pond outlet structure pipes shall have suitable gaskets to prevent
leakage and piping of water through the pond embankment.
D.
All pipe outlets shall discharge onto a stone rip-rap blanket to
prevent erosion of soil. Rip-rap will be sized considering pipe exit
velocities.
E.
Controls shall be installed at initial stages of earthmoving and
otherwise as outlined in the staging of earthmoving activities section
of the erosion and sedimentation control plan.
F.
The discharge of stormwater runoff shall be to a well-defined drainage
course which has a defined bed and bank. If stormwater runoff cannot
be discharged to a defined drainage course, documentation of written
permission from each downstream landowner shall be provided for all
properties between the source of discharge and the defined drainage
course.
G.
All stormwater detention facilities where the depth of water exceeds
two feet, shall be enclosed by a fence which is a minimum of six feet
in height with a locking gate of sufficient width to provide access
for maintenance vehicles.
H.
All storm sewers shall be laid with a full moon, to line and grade
with no horizontal or vertical deflection.
I.
The minimum pipe size shall be 15 inches. Under roadways and streets
the pipe shall be reinforced concrete pipe.
J.
The minimum pipe slope shall be one percent.
K.
The minimum cleansing velocity shall be two feet per second.
7.
Maintenance Criteria for Stormwater Control Facilities. Maintenance
is an essential part of the successful functioning of a stormwater
management system and the following shall be required:
A.
Maintenance During Development. Maintenance during development of
a project shall be the responsibility of the developer and/or landowner
and shall usually include, but shall not be limited to:
(1)
Removal of silt from all debris basins, traps or other structures
or measures when 40 percent of capacity is filled with silt.
(2)
Disposal of collected silt in a manner which will not adversely
affect the environment.
(3)
Periodic maintenance of temporary control facilities such as
replacement of straw bale dikes, straw filters or similar measures.
(4)
Establishment or re-establishment of vegetation by seeding and
mulching or sodding of scoured areas where vegetation has not been
successfully established. A developer or landowner retains this obligation
as to property he or she has developed or improved even if the proper
season for "seeding" occurs initially sometime after the project is
otherwise completed in whole or as to a particular phase. Vegetation
shall be maintained in such a manner as not to impede the performance
of the storm water facility.
(5)
Installation of necessary controls sufficient to protect against
problems caused by storm events within design frequencies.
(6)
Removal of all temporary measures upon completion of the project.
B.
After Acceptance of the Plan by the Township. In the event that the
Township accepts public improvements in the plan, except in cases
where an agreement between the developer and the Township have been
executed to the contrary, the maintenance shall be the responsibility
of the landowner and shall include, where necessary:
(1)
Mowing to maintain adequate stands of grass and to control weeds.
Chemical weed control may be used if State and Township regulations
are met. Selection of seed mixtures shall reflect the type specified
in the Township construction standards.
(2)
Removal of silt from all permanent structures which trap silt
or sediment to keep this material from building up in grassed waterways
and other permanent structures, thereby reducing their capacity.
C.
It shall be the responsibility of the landowner to inspect all permanent
facilities to see that corrective action is taken where necessary.
D.
Stormwater facilities located on private property shall be maintained
by the landowner or his agent; however, this does not relieve the
landowner or his agent of the obligation to inspect their own facilities.
The Township reserves the right to enter upon private property to
make periodic reasonable inspections and to require the landowner
to take necessary corrective actions. An easement shall be recorded
granting access over private property to the stormwater facilities.
8.
Stormwater Culverts. Stormwater culverts, bridges and similar structures
serving public streets, access driveways or other vehicular rights-of-way
shall be reinforced concrete pipe and designed to support HS-20 loading
and any other imposed loadings necessary without structurally damaging
the drainage system. Stormwater pipes outside paved areas may be PVC
or CMP. Stormwater culverts, bridges or other structures which do
not serve vehicular traffic shall be designed to support the necessary
loading without structurally damaging the pipe or affecting its capacity
for drainage. Said design shall be approved by the Township Engineer
and shall comply with the following requirements.
A.
Conduit size of culverts and other enclosed components of a stormwater
drainage system shall be based on computed hydrologic and hydraulic
data and computations shall be approved by the Township Engineer.
The minimum size of any enclosed structure to be maintained by the
Township shall be 15 inches in diameter.
B.
The design of any enclosed drainage course shall provide a minimum
cleaning velocity of two feet per second. When the design provides
for a maximum velocity greater than 10 feet per second, the enclosed
components shall be lined or protected to prevent scour.
C.
The design of headwall and endwall structures for enclosed stormwater
facilities shall be approved by the Township Engineer and shall be
in accordance with the Township construction standards.
D.
Energy dissipaters shall be required at the outlet side of all enclosed
culverts or similar components and shall be designed in accordance
with the Township construction standards.
E.
The type of materials used for enclosed culverts and similar components
shall comply with the Township construction standards. No stormwater
facility shall be enclosed or covered over until the Township Engineer
has inspected the construction.
9.
Open Stormwater Drainage Courses. Open stormwater drainage courses
shall be designed for a maximum velocity not to exceed 10 feet per
second and a minimum velocity of five feet per second. A minimum velocity
of three feet per second may be authorized by the Township Engineer
where a greater slope cannot be achieved to permit the standard required
minimum velocity. An open stormwater drainage course shall include
a lining (rip-rap, concrete or bituminous) to prevent erosion in cases
where vegetation will not prevent erosion. The applicant shall obtain
approval from the Washington County Soil Conservation Service, if
required.
[Ord. 2001-3, 12/10/2001, § 909]
1.
Size and Grade. Storm drains shall be adequate for the anticipated runoff when the area is fully developed. The minimum diameter of storm sewers shall be 15 inches, and the minimum grade shall be one percent, unless recommended by the Township Engineer and approved by Township Supervisors in accordance with the procedure specified in Part 10 of this Chapter.
2.
Manholes. For all pipe sizes, manholes shall be spaced at a maximum
of 300 feet. In addition, manholes shall be installed at all points
of abrupt changes in horizontal alignment and vertical grade. Inlets
may be substituted for manholes where practical.
3.
Inlets. Inlets of the type shown in the Township construction standards
shall be installed. Inlets at street intersections shall be placed
on the tangent and not on the curved portions.
4.
Castings. Manholes and inlet castings shall be as indicated in the
Township construction standards.
5.
Stormwater Roof Drains.
A.
For non-single family detached dwellings all roof drains shall discharge
storm sewer system which is controlled by a detention pond.
B.
All pipe from roof drains shall be a minimum four inch Schedule 40
ABS, PVC or SDR 35 pipe. Four inch Schedule 40 PVC or ABS pipe is
required for a distance of 10 feet from the foundation of the dwelling.
No stormwater drainage system shall be permitted to discharge into
any sanitary sewer system.
6.
A.=6. Unnatural Drainage. All points of concentrated flow discharge
shall outlet directly to a well-defined drainage channel. Whenever
construction stops or concentrates the natural flow of storm drainage
in such a way as to affect adjoining properties, approval of the owners
shall be obtained in writing. Approval of plans by the Township shall
not authorize or sanction drainage affecting adjoining properties.
7.
Water Courses. Open water courses shall not be permitted within the
rights-of-way of streets. The stopping, filling up, confining or other
interference with, or changing the course of, drains, ditches, streams
and water courses in the Township shall not be permitted unless approval
in writing is obtained from Township Supervisors. A permit shall be
obtained from the Department of Environmental Protection (DEP) of
the Commonwealth of Pennsylvania for construction or changes in a
water course subject to the regulations of the Pennsylvania Department
of Environmental Protection.
8.
Bridges and Culverts. All bridges and culverts shall be designed
to support expected loads and to carry expected flows and shall be
designed to meet current standards of the Pennsylvania Department
of Transportation. All bridges and culverts shall be subject to all
permits required by the Pennsylvania Department of Environmental Protection,
Bureau of Dams and Encroachments.
[Ord. 2001-3, 12/10/2001, § 910]
1.
Installation. Installation of sanitary sewers and appurtenances shall
be in accordance with the Township construction standards and the
regulations of the PA Department of Environmental Protection (PA DEP)
and subject to the approval of the Township Engineer. All utility
stubs shall be extended to the street right-of-way line.
2.
Minimum Size and Grade. The minimum diameter of sanitary sewers shall
be eight inches and the minimum grade shall be one percent.
3.
Laterals. Lateral connections, where required, shall be installed
to the right-of-way line of the street prior to road paving. Each
building shall have a separate connection to the Township sewer, except
that garages accessory to dwellings may be connected to the dwelling
line.
[Ord. 2001-3, 12/10/2001, § 911]
The developer shall connect to the public water supply and construct
a system of water mains with a connection for each lot.
[Ord. 2001-3, 12/10/2001, § 912]
In addition all applicable design standards specified in §§ 901
through 911 and 913 through 914, all land developments shall comply
with the following design standards.
1.
Lighting of Property.
A.
Parking and pedestrian areas on the property shall be lighted to
create a level of not less than one footcandle when measured three
feet above the pavement throughout the paved areas on the property.
Such lighting may be from freestanding lamp posts within the parking
areas, from nearby street lights or from lights mounted on buildings.
Lighting shall be shielded or aimed so as not to create glare conditions
on adjacent streets or properties. Lighting shall be designed so that
spillover lighting on adjacent properties shall not occur.
B.
Light standards in parking areas shall be protected from accidental
damage by vehicles.
2.
Landscaping.
A.
All areas of the property not paved or occupied by buildings shall
be landscaped and maintained in grass, shrubs, trees, ground cover,
mulching materials or other natural materials planted in accordance
with accepted minimum standards. At least five percent of the total
area of the property shall be set aside for landscaping. Lot areas
not covered by buildings, sidewalks, pavements or other improvements
shall be seeded with grass or other appropriate ground cover material
compatible with the landscape and architectural design and condition
of the surrounding areas. Landscaping materials shall not obstruct
sight distances at access points to the property.
B.
Where required by the Township Zoning Ordinance [Chapter 27], buffer areas shall be provided which comply with the design standards specified in the Zoning Ordinance [Chapter 27]. A landscaping plan shall be submitted which shows compliance with this Chapter, any Buffer Area requirements and required landscaping and screening of parking areas and loading areas.
3.
A.=3. Garbage and Trash Containers. All organic rubbish and discarded
materials shall be placed in tight vermin proof containers on the
property and shall be secured in side or rear yards screened from
public view by means of a solid face fence or wall. Containers shall
be emptied not less frequently than once a week. On properties where
food is served in paper containers, covered waste receptacles shall
be conspicuously located on the premises for use by patrons. The management
shall be responsible for maintaining the property free of litter.
4.
Parking Areas. Parking areas shall be designed in accordance with the provisions of the Township Zoning Ordinance [Chapter 27]. Ingress and egress and interior circulation on the site shall be designed to ensure safety and minimize congestion. Adequate provision shall be made for safe pedestrian circulation within the parking areas and from the parking areas to the buildings. Fire lanes shall be adequately marked and maintained in locations approved by the Township and fire marshal.
[Ord. 2001-3, 12/10/2001, § 913]
All subdivision and land development plans shall be designed
to meet the current standards of the Commonwealth and Federal law
with respect to handicapped accessibility, and verification of compliance
shall be provided to the Township by the applicant.
[Ord. 2001-3, 12/10/2001, § 914]
1.
Upon installation, manholes shall be vacuum tested and all sanitary
sewer lines shall be lamped and air tested by the developer in the
presence of the Inspector. Air tests shall be conducted in accordance
with the Township construction standards. Sewer lines shall also be
tested by passing a mandrel through the line.
2.
All construction materials used in sewers, streets, sidewalks and
other required improvements shall be tested by a qualified testing
laboratory. The cost for such tests shall be borne by the developer.
3.
Copies of the test reports shall be provided to the Township Engineer
and to the Chairman of the Township Supervisors.
