A.
Construction Plans. Along with the preliminary application and prior
to any construction, one complete set of construction plans including
profiles, cross sections, and other working drawings of required construction
improvements shall be submitted to the Director of Public Works.
B.
Reference Standard for Specifications. Reference is herein made to
include as a minimum standard, the construction methods and procedures
described in the "Standards Specification for Road and Bridge Construction"
Revision of 1971, as corrected June 1, 1974, and amendments thereto,
published by the RI DOT, Division of Public Works which is incorporated
into these Regulations by reference. In addition, safety provisions
shall be subject to OSHA regulations and additional written comments
of the Chief of the Police.
C.
Clearing and Grubbing. The applicant shall clear and grub the entire
area within the paved road and drainage area limits, as shown on the
approved plan, of trees, stumps, root systems, bushes and other objectionable
material. Living trees outside of the pavement areas shall be cut
only as directed by the Director of Public Works. The branches of
any trees left standing shall be carefully trimmed to give a clear
height of at least fourteen feet over the pavement area.
D.
Earth Excavation. Earth excavation includes, but is not limited to:
the removal of clay, sand, gravel, mud, loam, soft or disintegrated
rock which can be removed without blasting; boulders of less than
one cubic yard in volume (one half cubic yard in all trenches) and
other unacceptable materials within the limits of the roadway, drainage
or other excavation. This item of work also includes the backfilling
of all stump holes and other surface irregularities with suitable
gravel borrow material. Excavations shall be to a depth and cross-section
as shown on the approved plans, profiles and cross-section drawings.
E.
Rock and Ledge Excavation. Rock and ledge excavation includes removal
and disposal of all boulders one cubic yard or more in volume (one
half cubic yard in all trenches), and all hard ledge rock which can
be removed only by drilling and splitting by hand, by mechanical means
or by blasting. Such excavation shall be to a depth at least twelve
inches below subgrade and, where applicable, ledge side slopes shall
be four feet vertical to one foot horizontal from the edge of pavement
to the right-of-way edge.
F.
Subsurface Water. Where free water is encountered within three feet
of existing grade during the wet season, the subbase box elevation
shall be constructed no less than four (4) feet above the height of
seasonal water table.
A.
Materials.
1.
Base Course. Gravel borrow may be bank run or filler may be added
by approved methods and shall consist of sound, durable particles,
free from loam, silt, clay, and vegetable matter, containing no cobbles
over six inches in its largest dimension and meeting all other gradation
requirements for gravel borrow of the Town's standards. See Table
12.1.
|
TABLE 12.1
BASE COURSE GRAVEL GRADATION STANDARD
|
|
Sample __________________ Provided By __________________ Date
|
|
Drying Time ______________________________ Test Date
|
|
Signature
|
|
Screen
|
Wgt. Passing
|
% Passing
|
Acceptable % Passing
|
|---|---|---|---|
|
1/2
|
50-65%
| ||
|
3/8
|
45-60%
| ||
|
#4
|
40-55%
| ||
|
#40
|
0-10%
| ||
|
#200
|
0-5%
|
2.
Base Courses Surface. Crushed bank run gravel meeting gradation requirements
for crushed gravel in the referenced standard. Note section M.01.09,
Table 1, of the reference standard. Gravel produced by screening without
crushing shall not be acceptable.
3.
Binder Course. Bituminous modified binder (hot mix) conforming to
specifications of Section M.03.01 of the reference standard sufficient
to yield a uniform depth of not less than three inches.
4.
Surface Course. Bituminous concrete (hot mix), medium texture Type
1-1, sufficient to yield a uniform depth of not less than two inches.
Mix design minimum shall be seven percent of asphalt cement by weight.
5.
Materials. All materials must be made of a quality acceptable to
the Director of Public Works.
B.
General Conditions. During construction maintain the subdivision
roads in passable condition and take measures to eliminate the creation
of erosion, sediment, drainage or dust nuisances during construction.
A crushed stone construction pad entrance shall be required to prevent
mud transfer to existing roads.
C.
Construction Method.
1.
Street Base and Pavement Standards. Streets shall be constructed
to meet or exceed the minimum standards of Tables 11.1 and 11.2 and
12.1 and Figures 11.1 through 11.4.b. of these Regulations.[1] Road construction stakes shall be placed at linear intervals
no greater than fifty (50) feet and offset at least one foot beyond,
but no greater than four (4) feet from the proposed finished road
surface edge.
[1]
Editor's Note: Figures 11.1, 11.2, 11.3a, 11.3b, 11.4, 12.1 and 12.2 are included as attachments to this chapter.
2.
Preparation of Sub-base. Install underground sewer and water lines,
utilities, laterals, service lines, electric, communication lines,
and related facilities prior to any street construction. Thoroughly
compact sub-base with a fifteen ton vibratory drum roller, or its
equivalent, true to the lines, grades, and cross-section shown on
the approved construction drawings, at least thirty days after filling
and compaction of utility trenches. Sweep or otherwise clean the sub-base
clear of mud, loose and foreign material. Thoroughly dry sub-base
before spreading base course.
3.
Curbs. Where curbs are required, hold the edge of the wearing surface
to line and grade by the installation of curbs in accordance with
Section 12.3, Curbs. See Figure 11.3.[2]
[2]
Editor's Note: Figures 11.1, 11.2, 11.3a, 11.3b, 11.4, 12.1 and 12.2 are included as attachments to this chapter.
4.
Base Course. After the sub-base has been properly prepared and the
curbs or shoulder set, spread the base course for the full road width
and in such volume as to provide a cross section conforming to the
specifications and measurements of Table 11.1, Tables 11.2, and 12.1
after compaction with a fifteen ton vibratory drum roller or greater.
Note section 305.03.1 of the referenced standard.
5.
Base Course Surface. Following through compaction of the base course,
spread the crusher-run gravel for the base course surface for the
full road width to a depth of two inches after compaction with a fifteen
ton vibratory drum roller or equivalent.
6.
Application of Asphalt Surface. Asphalt shall be applied in accordance
with the following specification:
a.
The modified binder and surface courses shall consist of bituminous
concrete placed to minimum depths conforming to the specifications
of Table 11.2. Both layers shall meet the specifications of Section
M.03 of the reference standard.
b.
Placement of mixtures shall be by an approved self-propelled
paving spreader equipment with a compactor. The paving machine shall
be capable of paving not less than one full lane width and pavement
depth from twin operator stations at the rear of the screed. The mixture
shall be laid only upon a dry base containing no frozen materials
swept clean of all debris, mud, or other loose material and when outside
temperatures are above 50 degrees F. Mixtures shall be between 250
and 350 degrees F.
c.
Compaction shall be effected by rolling with a fifteen ton vibratory
roller or greater, equipped with a sprinkler system to wet the wheels
or rolls. The finished surface will have a density of no less than
ninety-six percent of voidless pavement composed of the same materials
in like proportion. Upon completion of the application and compaction
of the surface course, the street shall be closed to traffic for a
minimum of twenty-four hours.
d.
Traffic passing over newly constructed streets shall be limited
to wheeled vehicles and no tracked equipment permitted.
e.
All joints shall present the same texture, density and smoothness
as other section of the course. The joints between successive day's
work shall be made carefully in a manner to ensure a continuous bond
between old and new sections. Where new pavement is to meet existing
bituminous pavement, the existing pavement shall be sawed to a straight
edge presenting a vertical face for its full depth so as to expose
a fresh surface. This edge shall be painted with asphalt cement and
the new pavement placed to meet this line smoothly.
f.
All paving shall be done during the regular work hours of the
Public Works Department. No weekend or holiday work will be acceptable.
A.
Minimum Requirements. As required, streets shall be curbed with asphalt
curbing as shown on Figure 11.3 as a minimum requirement.[1] Curbing may be interrupted or perforated in places where
stormwater runoff shall be conveyed to road side swales or other BMPs
acceptable to the Planning Commission. Curbing shall be placed by
suitable mechanical means in accordance with the materials for the
road as specified.
2.
At all street intersections, curb returns shall have a radius of
at least twenty feet.
3.
Granite curbing shall have a minimum base thickness of six inches,
a minimum top thickness of six inches, a minimum depth of eighteen
inches, and shall extend above the finished gutter grade. The horizontal
and vertical alignment of the curbing shall conform to the established
line and grade as shown on the approved plan and profiles.
4.
All cape cod berms shall be five inches and formed and compacted
in one piece with the surface course.
[1]
Editor's Note: Figures 11.1, 11.2, 11.3a, 11.3b, 11.4, 12.1 and 12.2 are included as attachments to this chapter.
Construct sidewalks in accordance to the sidewalk cross-section
as detailed in Figure 11.2 as follows:[1]
A.
Materials: Refer to Section 12.2, Street Construction, A, Materials.
B.
Base Course: Compacted depth of six inches.
C.
Base Course Penetration: Apply a minimum rate of 0.75 gallons per
square yard. Allow application to stand for twenty-four (24) hours
without covering, after which it may receive a light covering of course
sand.
D.
Surface Course: Compacted depth of two (2) inches, I-2 bituminous
concrete in conformance with Section M.03.01 of the reference standard.
E.
Observe same timing of successive steps, use limitations, and surface
preparations as outlined for steps of road construction.
[1]
Editor's Note: Figures 11.1, 11.2, 11.3a, 11.3b, 11.4, 12.1 and 12.2 are included as attachments to this chapter.
A.
Earthwork and Drainage.
The minimum subsurface drainage pipe size shall be eighteen
inches of new class three reinforced concrete pipe. Upon review by
the Planning Commission, and in consultation with the Public Works
Director, the minimum size may be reduced to accommodate situations
where smaller pipes are integral to the effective management of stormwater
and the successful operation of LID BMPs.
Construct surface and subsurface stormwater structures and facilities
to conform to the RI Stormwater Design and Installation Standards
manual, and the following sections of the referenced standard, exclusive
of any items therein covering methods of measurement and basis of
payment.
1.
Earthwork:
Section 203, Structure Excavation and Backfill
Section 204, Trimming and Fine Grading
Section 205, Trench Excavation
2.
Drainage:
Section 701, Culverts and Storm Drains
Section 702, Manholes, Inlets, Catch Basins, and Headwalls
Section 703, Underdrains
Section 704, Paved Waterways
All catch basins and grates shall conform to RI DOT Spec. 4.31
and have a five foot minimum diameter with a three foot sump. Such
standard specifications may be modified at the discretion of the Director
of Public Works with the approval of the Planning Commission. Examples
of modifications may include, but are not limited to, those situations
where catch basins are used as pre-treatment devices in accordance
with Stormwater Design and Installation Standards manual.
B.
Manholes. Locate manholes on storm sewer trunk lines:
1.
At maximum distances of three hundred feet;
2.
At angles in the sewer lines, no curved designs will be acceptable.
3.
At street intersections and other points where catch basins, inlets
or laterals are to be connected;
4.
At points where pipe sizes change;
5.
At points where the grade of the sewer changes;
6.
All catch basins shall conform to the referenced standards and shall
be installed at intervals of three hundred feet or at such other intervals
as may be required by the Director of Public Works.
7.
Drainage frames and grates shall conform to RI Standard 6.3.4 High
Capacity Frame and Grates (Bicycle Safe). See diagram on page 100A.
C.
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
Commission will review for approval, an alternative proposal. Do not
cover any installed work until it has been inspected and approved
by the Director of Public Works.
D.
Minimum Dimensions. All subsurface drainage structures shall be constructed
using reinforced concrete pipe of an inside diameter no less than
eighteen inches. The pipe joints shall be totally sealed with mortar
cement. Upon review by the Planning Commission, and in consultation
with the Public Works Director, the minimum size may be reduced to
accommodate situations where smaller pipes are integral to the effective
management of stormwater and the successful operation of LID BMPs.
E.
Backfill Materials and Compaction. Drainage structures shall be backfilled
utilizing compactable crushed gravel borrow material with stones no
larger than two inches in any dimension. The materials shall be placed
and compacted in layer not more than eight inches in depth after compaction.
Compaction shall be achieved by mechanical tampers, vibrators or rammers
in accordance with 202.03.6 of the reference standard. A period of
thirty days shall pass after full mechanical compaction of all subsurface
drainage structures in the right-of-way. If after twenty-one days,
less than one inch of rainfall (measured at Green State Airport) has
occurred, the structures shall be thoroughly drenched with water to
the degree that water puddling is observed on the compacted material
over the structures.
A.
Install water mains when required, in conformance with the current
American Water Works Association Standard Specification.
A.
Location. Set at every lot corner, perimeter corner and angle point
on the boundary line of the subdivision and at every angle point of
curvature on the proposed street rights-of-way. Except in existing
historic stonewalls where the angle change is less than ten degrees.
B.
Materials. Quarry split (peen hammered top) granite or pre-cast reinforced
concrete conforming in size and shape to the specifications below:
C.
Setting Monuments. Set so as not to protrude more than four inches
above the finished grade.
Within ten feet of abutting property, limit changes to existing
grade to a slope of 2:1. Provide retaining structures to contain slopes
that exceed the 2:1 ratio. Rip-rap or other retaining walls shall
be sloped back at an angle of no more steep than one foot horizontal
to three feet vertical and constructed of boulders with at least three
sharp angular flat or cut surfaces. The installation of rip rap walls
shall be in conformance with accepted structural engineering practices.
The construction of such shall be inspected and certified by means
of a signed and stamped letter from a Rhode Island Registered Professional
Engineer.
All soil erosion and sediment control measures required by these
Regulations shall be constructed in accordance with the standards
and procedures set forth in the 1989 Rhode Island Soil Erosion and
Sediment Control Handbook, as may be amended from time to time.
Said handbook is adopted as an Appendix to these Regulations
and is available for review from the Administrative Officer.
A common private way in a residential compound shall have a
right-of-way width between property lines of not less than twenty-four
(24) feet and a travel way width of no less than twelve (12) feet.
A travel way is defined as that portion of a right-of-way that is
actually used for vehicular travel. The Planning Commission may require
additional right-of-way or travel way widths if conditions warrant
for reasons of public health or safety. Notwithstanding any other
provision of these Regulations, the travel way within a residential
compound shall have no sidewalks and shall have a pervious surface
composed of a two (2) inch layer of crushed stone [one-half (1/2)
inch to two (2) inch crushed stone] on top of a normal base course
as required by Section 12.2, Street Construction Standards. Adequate
drainage appurtenances are required to prevent washout and excessive
erosion. In addition, a turn-around or cul-de-sac may be required
by the Commission if conditions warrant.
