The following design standards shall be followed where applicable
in the design and construction of any subdivision or development involving
a public right of way or infrastructure that serves the public and
which must be constructed and maintained in accordance with appropriate
health and safety standards.
(a)
Frontage on Improved Streets. The area to be developed shall have
frontage on an existing, improved Town-accepted street. If such an
existing street has not been improved to the standards and specifications
as required in these Regulations, the Board shall require the subdivider
to make certain improvements along the part of the street abutting
the property or leading to the property being subdivided where necessary
for reasons which may include, but are not limited to drainage, safety,
traffic, snow or refuse removal, as deemed proper by the Board. Additionally,
the Board may require the construction of a permanent or temporary
cul-de-sac as a means to improve the safety and serviceability of
the lots in question.
For the purposes of these Regulations, streets platted but not
improved or accepted for maintenance by the Town, shall not be considered
existing, improved public streets. Where these streets are incorporated
within a subdivision or development, they shall be improved by the
applicant to meet the standards of these Regulations. Private streets
shall not be allowed.
(b)
Street Classifications. Street design within a proposed subdivision
or land development project shall conform to the street classification
system as established herein. Requirements for right-of-way and pavement
width, drainage, utilities, sidewalks, and other design standards
shall be tailored to the location and function of the specific roadway.
Three categories of streets shall be utilized. They are arterial roadways,
collector and local streets.
(c)
Roadway Design Standards. Roadway Design Standards for the three
roadway categories are as follows:
|
Roadway Design Standards
| ||||
|---|---|---|---|---|
|
Arterial Class A Street
|
Collector Class B Street
|
Local Class C Street
| ||
|
Right-of-way (feet)
|
80
|
60
|
50
| |
|
Street pavement width between curbs (feet)
|
38
|
30
|
26
| |
|
Minimum grade
|
0.5%
|
0.5%
|
0.5%
| |
|
Maximum grade
|
5.0%
|
8.0%
|
10.0%
| |
|
Maximum cul-de-sac length measured from centerline of intersecting
street to centerline center of cul-de-sac (feet)
|
600
|
600
|
600
| |
|
Maximum grade within 30 feet of intersection and within a cul-de-sac
|
1.0%
|
1.0%
|
2.0%
| |
|
Minimum centerline radii (feet)
|
600
|
300
|
300
| |
|
Minimum angle of intersection
|
60°
|
60°
|
60°
| |
|
Intersection radii - Class A (feet)
|
50
|
50
|
50
| |
|
Intersection radii - Class B (feet)
|
50
|
30
|
30
| |
|
Intersection radii - Class C (feet)
|
30
|
30
|
30
| |
|
Maximum tangent length between reverse curves (feet)
|
100
|
100
|
100
| |
|
Maximum rate of super elevation per foot (banking) (feet)
|
0.08
|
0.08
|
0.08
| |
|
Slope of pavement (minimum) (inches per foot)
|
3/8
|
3/8
|
3/8
| |
|
Intersection sight distance (feet)
|
400
|
200
|
200
| |
|
The Planning Board may require additional width or traffic calming
devices for streets subject to heavy traffic volume. Should an applicant
propose development resulting in a potential significant impact on
a heavily trafficked road, e.g., Mendon or Diamond Hill Roads, or
propose a large commercial or industrial complex, Planned Unit Development
or Major Subdivision, the applicant may be required to perform a specific
set of studies to determine the most appropriate design for the ultimate
function that roadway will provide.
|
(d)
Sidewalks. Concrete sidewalks, four feet in width or as appropriate
to satisfy ADA requirements, shall be required in all subdivision
and development projects on both sides of the street. Sidewalks shall
abut the curb. Public rights of way shall be owned by the Town and
not by abutting landowners. Landscaped areas in the right of way shall
be maintained by abutting landowners. Street trees shall be maintained
by the Town.
(e)
Bicycle Paths. Bicycle paths shall be incorporated into the proposed
subdivision where they are necessary to extend an existing bicycle
path or bike walk; to intersect with proposed State and local bicycle
facilities; to connect adjacent developments where vehicular connections
would be impractical; to further the goals of the Cumberland Comprehensive
Plan; or where adjacent or nearby public or private schools, recreation
areas, or other similar facilities would be likely to generate bicycle
traffic.
Bicycle paths may be incorporated into sidewalk systems within
subdivisions, at the discretion of the Planning Board. Bicycle path/sidewalks
shall be no less than six feet in width, as to accommodate both pedestrian
and bicyclist.
(f)
Street Layout and Arrangement. The proposed arrangement of streets
shall be considered in relation to the existing street system, and
to existing topographic and natural conditions. The road system shall
be designed to permit the safe, efficient and orderly movement of
traffic; to meet, but not exceed, the needs of the present and future
population to be served; to have a simple and logical circulation
pattern; to respect natural features and topography; and to create
an attractive streetscape.
Proposed streets within a development shall provide for their
continuation or projection to intersect with principal streets on
the perimeter of the subdivision or with adjacent vacant property
in order that the streets may be extended at a future time. Access
shall be designed to have more than one principal means of egress.
Where street rights-of-way grades require two feet or more of
cut or fill, retaining walls will be required or the abutting land
will be graded to a maximum slope of 2:1 at the street right-of-way
line. Retaining walls must be constructed on private land and not
in the public right-of-way.
(g)
Street Intersection. Street intersections shall either coincide precisely
with, or be offset by at least 150 feet from other intersections.
Intersections shall be at ninety-angles, unless otherwise approved
by the Planning Board. No intersection shall contain an angle of less
than 75°.
All roadway intersections shall be designed to have the corner
sight distances as designated in Roadway Design Standards section.
Corner sight distance is measured from a point on the minor road at
least 15 feet from the edge of the major road pavement and measured
at eye height of 3:75 feet on the minor road to a height of object
of 4.5 on the major road.
Intersection roadway pavements shall have a paved transition
area at all corners to accommodate turning movements.
(h)
Dead End Streets (Cul-de-sacs) All dead end streets shall end in
a cul-de-sac turnaround and shall be clearly marked at their entrances
with a "No Thru Street" sign. Dead end streets without a turnaround
are not allowed. The lengths of dead end streets shall be a maximum
of 600 feet. The Planning Board may further limit the length of the
dead end street (cul-de-sac) where necessary, to ensure the adequate
and safe circulation of vehicular traffic. Length of a dead end street
shall be measured from the center of the turnaround to the centerline
of the nearest intersecting street. Every cul-de-sac, other than those
less than 300 feet in length, shall have a raised, curbed and landscaped
interior island. Landscaping will be done in such a way as to not
inhibit sight distance across the cul-de-sac. Proposals involving
cul-de-sacs with raised islands shall include provisions for the maintenance
of such islands.
(i)
Street Names. An extension of an existing street shall have the same
name as the existing street. Names of new proposed streets shall be
substantially different from any existing street name in the Town
of Cumberland. The Town's 911 Coordinator must approve all street
names.
(j)
Access to Adjoining Property. When the Planning Board requires the
provision of access to adjoining property, proposed streets (also
known as "stub roads" or "connectors") should not be constructed,
but rather the rights-of-way shall be marked with monuments so that
they remain recognizable. The reservation of strips of land preventing
such access shall not be permitted. Where a dead-end street is to
provide future access to adjacent property, the Planning Board shall
require an easement and the construction of a temporary cul-de-sac
until such time as the street is extended.
Access to adjoining property for pedestrian and/or bicycle circulation
shall be required if the Planning Board finds that the connection
will either: increase accessibility between adjoining subdivisions;
join existing or proposed sidewalks or bicycle paths; join subdivisions
to major public or private schools, recreation areas or other facilities;
or, significantly enhance the public safety by providing such pedestrian
and/or bicycle connections.
(k)
Street Signs. Street and traffic signs and other traffic calming
measures shall be installed by the developer at the developer's expense.
(l)
Street Lighting. Provisions shall be made for street lighting. All
costs associated with the installation of street lights including
but not limited to street light pole and lighting fixture shall be
borne by the developer.
(m)
Street Trees. Street trees are required in all subdivisions and land
development projects. All planting shall be done under the supervision
of a licensed arborist. The applicant shall plant street trees appropriate
for the terrain, soil and climatic conditions encountered in the development.
Street trees shall be planted, or existing trees shall be preserved,
along both sides of all streets to be located within the landscaped
area as determined by the Planning Board.
Trees shall be planted at distances of not more than 50 feet
apart and no closer than five feet to the edge of road pavement or
sidewalk. At street corners, trees shall not be planted within 25
feet of the intersecting right-of-way lines or such that they interfere
with utilities.
Trees shall be grown under local climatic conditions and be
of symmetrical growth, free of insect pests and disease, suitable
for street use and durable under the maintenance contemplated. Trees
should have a minimum caliper size of three to 3.5 inches when planted.
The lowest branch shall be at least 80 inches above finished grade
to meet ADA standards. Trees proposed for planting shall be approved
by the Planning Board. Loam shall be clean, of good quality and of
such fertility and composition that it will support plant growth.
The species selected are to be suitable for Zone 5 hardiness
as published by the U.S. Department of Agriculture.
Street trees shall be planted in holes at least six inches deeper
and 1 1/2 times as wide as the root ball. Larger excavation may
be required in gravel or sand areas. Trees shall be planted at their
previous depth in good quality topsoil or soil conditioned to the
quality sufficient organic matter such as peat moss and a balanced
fertilizer.
Street trees shall be maintained by the applicant from the time
of planting until the time of the release of the maintenance guarantee
following acceptance of streets by the Town Council. Maintenance shall
include, but not be limited to, watering and pruning of trees, as
necessary. The Planning Board may require separate guarantee provisions
for maintenance of required street trees by the applicant for a maximum
period of two years from the date of planting. Any trees, which are
not healthy at the end of the guarantee period, shall be replaced
at the applicant's expense and guaranteed until satisfactorily established.
(n)
Bridges. The minimum clear width for all new bridges on streets with
curbed approaches should be the same as the curb-to-curb width of
the approaches. Sidewalks on the approach shall be carried across
all new structures. If no sidewalks are required on the approaches,
the bridge shall be as wide as the required pavement plus five feet
on either side.
(o)
Roadway Widths Centerline Pavement Markings. Centerline striping
shall be per RIDOT Standard when required by the Department of Public
Works or Police Department.
The Planning Board may require easements for easy access to
improvements on private land that serve more than one lot as described
below. The Board may, in its own discretion, require the dedication
of land to the Town in lieu of easements if such dedication would
provide greater control over and access to the intended use. Existing
and proposed easements must be labeled accordingly on all plans.
(1)
Sanitary Sewers. Easements shall be provided for sanitary sewers.
The Planning Board will require permanent easements of such width
as recommended by the Sewer Department or Narragansett Bay Commission.
The minimum width for a sewer easement shall be 20 feet.
(2)
Water. Easements shall be provided for public water lines. The Planning
Board will require permanent easements of such width as recommended
by the Water Department. The minimum width for a water easement shall
be 20 feet.
(3)
Drainage Easements. Where above ground drainage flows are directed
over private property which does not contain natural watercourses
or wetlands, or where publicly owned and maintained drainage systems
outfall on private land, a drainage easement shall be dedicated to
the Town over the area and at a location adequate for the intended
purpose. Easements into and upon above ground drainage facilities
such as storm water detention or retention basins shall be granted
to the Town wherever storm water from Town-owned streets or other
improvements is intended to be directed to such basins. The minimum
width for such a facilities drainage easement shall be 20 feet.
(4)
Sight Distance Easements. Where deemed necessary by the Planning
Board to establish or maintain adequate sight distances for vehicular
traffic, the dedication of an easement to the Town may be required
which would prohibit the erection or maintenance of any visual obstruction
such as a structure, tree, shrub, wall, earthen embankment, hill or
any other obstruction.
(5)
Bicycle or Pedestrian Access Easements. Bicycle and pedestrian access
shall be provided where required on a separate strip of land outside
of the right-of-way dedicated to the Town or on an easement having
a minimum width of 15 feet.
(6)
Conservation Easement. All land dedicated for open space or recreational
uses shall be covered by a Conservation Easement prohibiting its future
development for residential use as well as ensuring its perpetual
maintenance as conservation, recreation, or park land for the enjoyment
of present and future residents.
(7)
Other Easements. All other required easements shall be of sufficient
width and area for the intended purpose, as determined by the Planning
Board.
When utilities exist in the general area of a new development,
the developer will be either required or encouraged to extend those
utilities, depending on the utility's type. The installation of utilities
will be done to the standards set forth by the individual utility
companies. The developer is required to work directly with the utility
companies in this regard. All necessary easements for access and repairs
shall be part of the recorded plat and related documentation. If easements
are necessary to access improvements, then those easement areas should
be constructed of a gravel base suitable for travel by heavy trucks
and construction equipment.
(1)
Sanitary Sewers. Sanitary sewers shall be required in all developments
that are in or contiguous to older village areas or neighborhoods
where sewers already exist. Otherwise, proposed sewer connections
shall be evaluated and allowed only upon consideration by the Planning
Board and the Sewer Department and in accordance with the Town's Growth
Management efforts. Sewer lines shall be installed in conformance
to the specifications of the Cumberland Sewer Department or Narragansett
Bay Commission.
(2)
Water Lines. Connections to the public water system shall be required
in all developments that are in or contiguous to older village areas
or neighborhoods where such lines already exist. Otherwise, proposed
water connections shall be evaluated and allowed only upon consideration
by the Planning Board and the Water Department and in accordance with
the Town's Growth Management efforts. Water lines shall be installed
and water stops shall be provided for each lot in accordance with
the specifications of the Cumberland Water Department or Pawtucket
Water Supply Board. Water lines shall be looped to avoid dead end
water lines in accordance with WWA standards. The developer should
submit a wellhead protection plan for the Town's review if a community
well is proposed.
(3)
Gas Lines. Natural gas lines may be installed in any subdivision
or land development project at the discretion of the developer.
(4)
Communication and Electrical Lines (Electric, Telephone, Cable TV,
and Fire Alarm). All communication and electrical lines shall be installed
underground.
(5)
Fire Hydrants/Other Fire Protection. Fire hydrants shall be installed
in all developments where public water supply systems are available.
Hydrant type, location, spacing and water pressure shall meet the
minimum requirements of the National Fire Protection Association and
local Fire Departments. When it is determined by the local Fire Department
that on-site water storage facilities are required to provide adequate
fire protection, such facilities as water holding tanks shall be of
the appropriate size and design as designated by the Fire Department
and shall be installed by the developer under the direction of the
Fire Department.
(a)
A landscape plan (certified by a RI registered Landscape Architect)
shall be provided as part of any Preliminary submission involving
the construction or extension of a public right of way. It shall be
conceived in a total pattern throughout the site, integrating the
various elements of site design, preserving and enhancing the particular
identity of the site and creating a pleasing site character. The "Cumberland's
Vision" document may serve as guidance where appropriate.
(b)
Landscaping shall address plant materials such as trees, shrubs,
ground cover, grass, flowers, etc., but may also include other materials
such as wetlands, stone walls, paving materials, planters, signage,
and street furniture. Areas that may be required to provide landscaping
shall include, but are not necessarily limited to the following:
(1)
Drainage facilities, such as retention/detention basins, or
drainage swales;
(2)
Entrance features;
(3)
Open space areas;
(4)
Proposed recreation facilities;
(5)
Buffer areas;
(6)
Lot areas that are disturbed during the construction process
or where extensive grading removes a significant amount of natural
vegetation;
(7)
Areas subject to re-grading or stabilization for soil erosion
and sediment control purposes;
(8)
Areas disturbed by utility installation; and
(9)
Cul-de-sac islands.
(c)
Trees and other existing vegetation shall be retained whenever feasible;
areas within the drip line should be temporarily fenced or otherwise
protected against damage during construction.
 |
(d)
Plantings installed by the applicant shall be maintained until the
time of the release of the maintenance guarantee as required by the
Planning Board. Any unhealthy or dead trees or landscape improvements
shall be replaced at the developer's expense and shall be guaranteed
for one year.
(1)
The drainage system may be comprised of natural and man-made elements,
including grassed swales, curbs, catch basins, culverts, and storm
water pipes. The applicant is required to minimize the use of retention
and detention basins and incorporate natural elements into the drainage
design whenever possible using the Best Management Practices (BMPs)
and standards of the State of Rhode Island Storm Water Design and
Installation Standards Manual. The use of retention/detention ponds
will only be allowed when the developer convinces the Planning Board
that this is the only viable option for the development. BMPs such
as grassed swales and vegetated filter strips, not only collect and
transport storm water, but also mitigate pollution; reduce sedimentation;
provide visual aesthetics, recreational opportunities, and potential
wildlife habitat. However, in recognition of maintenance issues associated
with these systems, alternatives may be proposed for consideration.
Drainage structures shall be in conformance with the accepted State
RIDOT Standards, or approved equals.
(2)
Drainage plans and drainage calculations shall be prepared by a State
of Rhode Island Registered Professional Engineer. All applicable environmental
permits must be obtained from state and federal regulatory agencies.
The storm water drainage calculations, runoff rates, and system design
shall be based on the application of the appropriate method as follows:
a.
The Rational Method. This is the preferred method for pavement drainage
and other small systems of three acres or less, where no wetlands,
ponds, or other storage depressions are present, and where drainage
is toward the point of analysis.
|
Q = C x I x A
|
|
Where:
| ||||
|
Q
|
=
|
Peak Discharge
| ||
|
C
|
=
|
Runoff Coefficient
| ||
|
I
|
=
|
Rainfall Intensity
| ||
|
A
|
=
|
Area of Watershed
| ||
b.
U.S. Soil Conversation Service (1986) revised Technical Release 55
(TR-55). This method is preferred for calculating runoff volume, peak
discharge rate, and flood storage requirements for site development
on sites generally larger than three acres or when detention basins
are proposed.
(3)
Drainage Plan and Calculations. The drainage plan and drainage calculations
shall contain the following information:
a.
The proposed drainage system shall be designed to accommodate storm
water such that post-construction conditions do not result in increased
peak run-off from pre-construction conditions (zero net increase)
for the one-hundred-year frequency rainfall event.
b.
An estimate of the quantity of storm water surface run-off presently
flowing from the land proposed to be subdivided, and that which would
be generated by the proposed subdivision, calculated on the basis
of the two-, ten-, twenty-five-, and one-hundred-year frequency, twenty-four-hour,
Type III, rainfall events.
c.
An estimate of the quantity of storm water run-off entering the subdivision
naturally from upstream areas within the watershed under present conditions,
calculated on the basis of the two-, ten-, twenty-five-, and one-hundred-year
frequency rainfall.
d.
An analysis of the capability of existing watercourses, storm water
culverts and other drainage facilities within the land proposed to
be subdivided to handle the run-off as calculated under a. and b.
above, and proposals to handle such surface run-off. Design criteria
for drainage improvements shall conform to the State specifications,
but may be modified by the Town of Cumberland. Culvert and storm sewers
shall be designed as follows: pipe sizing for the twenty-five year
frequency rainfall; cross culvert sizing for fifty-year frequency
rainfall, one-hundred-year frequency in a special flood hazard zone.
e.
Proposals for disposal of surface run-off, downstream from the subdivision
without danger to land and improvements or to the receiving water
body.
f.
The drainage plan and narrative shall further indicate how the following
specific requirements will be met: (i) that each lot will be adequately
drained; (ii) that natural drainage patterns will be maintained whenever
possible; (iii) that all existing watercourses will be left open,
unless approval to enclose is granted by the Planning Board and the
Rhode Island Department of Environmental Management (RIDEM); (iv)
that all new open watercourses will be seeded, sodded or paved depending
on grades and soil types; and, (v) that a continuous drainage system
will be installed and connected to a natural or manmade water course
or to an existing piped storm drainage system. The ultimate destination
of such continuous drainage shall be a permanent natural body of water
or wetland. Where the Town's Engineer determines that such ultimate
destination is impractical, the Board shall require the construction
of a retention or detention area capable of accommodating proposed
storm water volumes based on the two-year, ten-year, twenty-five-year,
and one-hundred-year frequency rainfall events.
(4)
Where any part of the drainage system is proposed for location outside
the public street right-of-way, the Planning Board and Department
of Public Works must approve the proposed provisions for future maintenance.
(5)
All necessary easements to off-street watercourses will be submitted
by the applicant and approved by the Town Solicitor.
(6)
Where volume velocity of the surface run-off is high, the flow thereof
shall be controlled by one of the following: rip-rap, sediment basins,
flow spreaders, or other applicable devices and/or techniques recommended
in the Rhode Island Soil Erosion and Sediment Control Handbook.
(1)
Construction Plans. Complete sets of all construction plans, profiles,
cross-sections and other working drawings of required construction
improvements shall be submitted to the Administrative Officer as part
of the Final Plan submission. One set, with approval indicated thereon,
shall be returned to the developer.
(2)
Notification. A pre-construction meeting shall be held with the Administrative
Officer and Town Engineer at least seven days prior to the start of
any subdivision or development improvements. The developer, or his/her
representative, and the on-site project manager shall attend this
meeting.
No step in the construction of required improvements shall commence
until the Town Engineer has been notified, in writing, at least 48
hours (excluding weekends or holidays) in advance of the beginning
of that step.
Where construction intersects an existing road and a Police
detail is required, the developer shall pay for such detail and shall
also pay for any public notification regarding temporary road closures
or detours due to construction.
(3)
Inspection of Improvements. Each phase or step in the construction
of required improvements shall be inspected on-site and approved,
in writing (including date of inspection and signature of authorized
inspector), by the Town Engineer, or his/her authorized representative.
Any stage of construction begun without written consent of the Town
Engineer shall be at the developer's risk. No subsequent phase or
step shall commence until such inspection and approval has been completed.
No performance guarantee shall be released unless all inspections
have been made in accordance with these Regulations. At a minimum,
on-site inspections shall take place at the following stages in the
construction of improvements:
a.
During installation of all underground drainage, electrical, telephone,
and cable television lines and following installation of utilities,
prior to backfilling. In addition, the appropriate Fire Department
and Utility Companies, as appropriate, shall conduct on-site inspections
during installation of utilities.
b.
During preparation of the sub-base, backfilling and the installation
of curbing or shoulders, prior to application of the base course.
c.
During spreading and compaction of the base course, prior to the
application of the final course of asphalt.
d.
Immediately prior to and during the application and compaction of
the surface course on the roadway and sidewalks.
e.
During completion of all improvements and installation of monuments.
|
Additional inspections may be required by the Town Engineer
at such other intervals as deemed necessary to assure proper construction
of improvements.
| |
|
The Town Engineer, upon proper notification, shall not impede
the construction of improvements by delaying inspection and approval
without just cause.
|
(4)
Record (As-Built) Drawings. Upon completion of construction of all
required improvements, the developer shall furnish one set of "as-built
drawings" of such improvements to the Administrative Officer. As-built
drawings shall contain all of the information on the Final Plan and
set forth: the exact location of all sidewalks, streets, monuments,
water, sewer and drainage pipes, other underground or aboveground
utilities and all other public improvements, as installed. These Plans
must be computer generated with Computer Aided Drafting (CAD), automated
mapping, or GIS software. Copies of digital files on magnetic or optical
media must be submitted with the hardcopy of the Plan to be approved.
If submitted in an AutoCad format, dxf files are preferred. Georeferencing
coordinates for the plans within each dxf layer in the NAD83-RISPC
in feet are preferred, but local coordinates are acceptable. If not
already shown on the Plan, supplemental metadata should include the
name and version number of the computer software used to generate
the digital files and the name, company address and registration number
of the land surveyor performing the work.
Plans must include appropriate professional certifications that
all systems will function as designed and constructed and that all
horizontal and vertical locations are accurate as illustrated on the
as-built drawings.
(5)
Reference for Specifications. Should any clarification be required
on the construction specifications contained herein, reference is
hereby made to the "Standard Specifications for Road and Bridge Construction,"
published by the State of Rhode Island, Department of Public Works,
Division of Roads and Bridges, as revised. In general, all construction
shall be in conformance with the Rhode Island Department of Transportation
(RIDOT), Division of Public Works, Standard Details, as revised and
State of Rhode Island and Providence Plantations, Department of Transportation,
Division of Public Works, Standard Specifications for Road and Bridge
Construction, as revised.
(6)
Testing. The Administrative Officer or Town Engineer may require
any or all of the following tests to be conducted during the course
of inspections, the cost of which shall be paid by the applicant:
compaction, sieve analysis of materials, and/or wet season groundwater
determination.
(a)
Dimensions. All streets constructed within subdivisions and developments
shall conform to the standards contained in these Regulations.
(b)
Clearing and Grubbing. The entire roadway area and sidewalks, as
shown on the approved plat, shall be cleared and grubbed. All root
systems, trees, stumps, bushes and other objectionable material shall
be removed and transported away from the development. Healthy trees
within the right-of-way should be left standing and protected from
construction disturbance provided they are located outside the roadway
and sidewalk areas.
(c)
Earth Excavation. Earth excavation shall include, but not be limited
to, the removal of clay, sand, gravel, loam, soft or disintegrated
rock which can be removed without blasting, boulders of less than
one cubic yard in volume (1/2 cubic yard in all trenches) and other
unacceptable materials within the limits of the roadway, drainage
or other excavation. This item of work shall also include the backfilling
of all stump holes and other surface irregularities with suitable
fill materials. All excavations shall be to a depth and cross section
as shown on the approved plans, profiles and cross section drawings.
All fill materials shall be approved by the Town Engineer and be clean,
non-hazardous material.
(d)
Sub-Surface Water. Where free water is encountered within three feet
of finished grade, adequate drainage shall be constructed at a depth
of at least four feet below finished grade.
(e)
Utility Connections at Lot Boundaries. All new streets shall have
an undisturbed finished surface course for acceptance by the Town.
All underground utilities shall be brought to the property line of
each lot before the binder course is installed in order to provide
for utility connections without disturbing the finished surface course.
If, due to an emergency, road cuts are necessary in the surface course
prior to acceptance by the Town, the Administrative Officer or Town
Engineer shall be notified within 24 hours of the cut. Cuts shall
be sealed using infrared seal in accordance with the RIDOT Standards.
(f)
General
Construction Materials and Methods. The applicant shall, at all times
during construction, maintain the roads in passable condition and
shall take appropriate measures to eliminate the creation of a dust
nuisance during construction. Upon notification of a dust nuisance,
the applicant shall have to, within 24 hours of said notice, sweep
the street with a mechanical sweeper and use dust suppression equipment
to the satisfaction of the Town Engineer.
1.
Materials:
a.
Base Course: Bank run processed gravel meeting the following gradation
requirements for gravel borrow in the referenced standard: Section
M.01.02 Gradation of Aggregates Table 1 Gravel Borrow sieve sizes.
b.
Binder Course: Bituminous concrete (hot mix). Medium Texture Type
I-1 must conform to RIDOT Standard Mix, Section M.16 for Modified
Binder.
c.
Bituminous Surface Course: Bituminous Concrete (hot mix). Medium
Texture Type I-1 must conform to RIDOT Standard Mix.
d.
All materials must be of a quality acceptable to the Town Engineer.
2.
Construction Method:
a.
Preparation of Sub-base: Install underground sewer and water lines,
utilities, laterals, service lines and related facilities prior to
any street construction. Trenches shall be compacted in six inches
lifts. Thoroughly compact sub-base with a ten-ton roller, or its equivalent,
true to the lines, grades, and cross sections shown on the approved
construction drawings, at least 30 days after filling and compaction
of utility trenches. Clean the sub-base from any debris including
accumulated organic material before spreading binder course.
b.
Curbs: Hold the edge of the wearing surface to line and grade by
the installation of curbs.
c.
Binder Course: After the sub-base has been properly prepared and
the curbs or shoulders set, spread the binder course for the full
road width and in such volume as to provide a two-inch cross section
after compaction with a ten-ton roller or the equivalent.
d.
Surface Course: Apply as follows:
(1)
Sweep the binder course clean of sand and debris. Remove protrusions,
and bring holes, ripples or unevenness in the surface back to true
line and cross section by the spot application of surface course mix.
(2)
Apply surface course at a temperature of 295 to 350° F.
by means of an approved paving spreader with a compactor. Place in
sufficient quantity to provide a minimum compacted cross section of
two inches.
(3)
Compact the surface course with a ten-ton roller equipped with
a sprinkler system to wet the wheels. Rolling shall be continued until
all roller marks are eliminated and the minimum densities have been
obtained based upon 95% of laboratory Marshall Densities made in proportions
of the job-mix formula, method AASHTO T-254. Upon completion of the
application and compaction of the surface course, allow standing for
a minimum of eight hours without traffic.
(4)
Limit traffic passing over constructed street to wheeled vehicles;
no tracked equipment is permitted once the surface course has been
applied.
(5)
Do not install bituminous material when the soil conditions
are not suitable or during other unfavorable weather conditions as
may be determined by DOT standards or the Town Engineer. Weather limitations
for bituminous plant mix shall not be placed on any wet surface, or
when air temperature is below 40° F., or when weather conditions
otherwise prevent the proper handling or finishing of the bituminous
mixtures.
(g)
Curbs. Street curbs shall be made of granite. At street intersections,
provide curb returns or shoulders with a radius of at least 25 feet.
Use appropriate Rhode Island Standard curb shapes for curb transition,
inlet and apron installations. Install handicapped access transition
drops in curbs as directed by the Planning Board.
(h)
Sidewalks and Driveways. Construct sidewalks, when required, in accordance
with Rhode Island Standard Detail 43.1.0 "Cement Concrete Sidewalk".
When conditions warrant the appropriate Rhode Island Standard Detail
shall be utilized (i.e., driveway openings). Driveway openings shall
in all cases attain an elevation of six inches higher than the road
at the curb and gutter line to avoid flooding of the property from
street runoff.
(1)
Earthwork and Drainage. Construction of storm drainage structures
and facilities shall conform to RIDOT standards.
(2)
Manholes. Locate manholes on storm sewer trunk lines:
(3)
Minimum Cover. Provide subsurface drainage structures and facilities
within street rights-of-way, with a minimum cover of three feet. Where
required minimum cover is physically impossible to achieve, the Planning
Board and Town Engineer may review for approval, a possible alternative
proposal.
(4)
Drainage Ponds. Natural elements, such as swales and vegetated filter
strips, are encouraged and shall be incorporated into the drainage
design in accordance with the standards of the State of Rhode Island
Storm Water Design and Installation Standards Manual. However, where
retention and detention ponds are deemed necessary, they shall be
designed to conform to the requirements of the RIDEM. Where the requirements
of the Town of Cumberland are more stringent, the design shall conform
to the requirements of the Town.
Ponds shall be designed in such a manner as to minimize their
nuisance, visual, and social impacts and to allow their successful
integration into the development. In addition to drainage and construction
standards, ponds, swales and their related structures will be evaluated
regarding safety, environmental, aesthetic, and social impacts. In
order to achieve that goal, ponds shall meet the following criteria:
a.
Ponds shall be graded in a naturalistic and curvilinear manner and
shall be integrated into the existing contours of the site. Pond side
slopes shall not exceed five to one or a 20% slope. Pond bottoms shall
be flat except for minimal grade required for complete drainage in
dry ponds.
b.
The use of riprap shall be minimized. No dumped riprap will be allowed.
All riprap shall be placed and shall conform strictly to RIDOT standards.
c.
The entire area of the pond shall be planted in such a manner as
to integrate the new pond into the surrounding landscape. Plantings
shall include a mixture of aquatic, emergent, and upland wetland plant
species. Planting plans shall be provided which indicate: genus and
species, size, quantity, and method of planting. Ponds that are designed
to retain water shall be planted with appropriate wetland vegetation
below the normal water line. The plantings shall not be planned to
obstruct views of the pond in such a manner as to create a public
hazard. Planting plans will be evaluated for their use of native materials,
maintenance requirements visual quality, and appropriateness for wildlife.
d.
A detailed maintenance plan shall be provided for each pond. The
plan shall address silt removal, vegetation maintenance, mowing requirements,
and any other information required by the Planning Board.
e.
Drainage ponds shall be located on private property with appropriate
easements to allow Town entry for repair and the removal of inappropriate
owner improvements, as may be required. Access shall be designed and
constructed in such a manner so as to provide adequate access for
equipment and vehicles in all weather. The access shall be marked
and planted in an appropriate manner.
|
When practical, several small basins would be preferred to a
large, single basin.
|
(1)
Permanent monuments shall be installed by the developer starting
at every corner and angle point on the boundary line of the development
and at every angle point of curvature on the proposed street rights-of-way,
in accordance with the approved plat. Open space and/or conservation
areas that are a condition of approval must be marked with monuments
as well.
(2)
Monuments must be made of quarry split (peen hammered top) granite
or pre-cast, reinforced concrete conforming in size and shape to the
specifications below:
(3)
Bounds are to be set six inches above finished grade, except in sidewalks
and driveways where they shall be set flush with the finished grade.
Where the monuments delineate open space areas, they should be 48
inches in length and set such that half of the monument is revealed.
