Construction of streets shall be in accordance with the typical cross section of a street contained herein[1] and the Standard Specifications for Road and Bridge Construction (1997 edition) published by the State of Rhode Island Department of Transportation, unless otherwise noted. Drainage systems shall be constructed in accordance with the Standard Specifications for Drainage Systems as adopted herein. Sidewalks and curbing shall be constructed in accordance with the Specifications for the Installation of Sidewalks and Curbs as adopted herein.
[1]
Editor's Note: See the figures included as an attachment to this chapter.
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 Rhode Island Soil Erosion and Sediment Control Handbook, prepared by the United States Department of Agriculture Natural Resources Conservation Service, the Rhode Island Department of Environmental Management and the Rhode Island State Conservation Committee, 1989, and any amendments thereto. (Refer to Article XIII, § 450-52D.)
[1]
Editor's Note: See also Ch. 305, Soil Erosion and Sediment Control.
The following procedures shall be followed by the developer, and by contractors under the direction of the developer, in the construction of any development, subdivision, or related improvement:
A. 
Construction activity.
(1) 
No building, construction, removal of trees, or disturbance to the land may occur on a Sunday or a holiday, as recognized by the State of Rhode Island, in any approved subdivision or development. Hours of construction activity are permitted only between 7:00 a.m. and 7:00 p.m. Machines shall not be left idling prior to or after this time frame.
(2) 
No tree cutting, land clearing, or site grading, nor any infrastructure construction shall be permitted prior to preliminary plan approval, unless authorized by the Planning Board, and in accordance with an approved soil erosion and sediment control plan (Town Code Chapter 305). Once an application has been submitted to the Planning Board for a subdivision or development project, no building permits, nor any other pre-development construction, shall be granted until the final plan has been approved by the Planning Board and recorded in the Land Evidence Records.
(3) 
Proposed conservation lands and other sensitive features, such as historic stone walls and large specimen trees, shall be adequately protected during construction, such as including the use of fencing and informational signage. Such protective measures, including limits of disturbance and erosion and sedimentation controls, shall be installed prior to the start of construction.
B. 
Pre-construction meeting. A pre-construction meeting shall be held with the Director of Public Works or Highway Supervisor, the administrative officer, and the Town's engineer at least seven days prior to the start of any subdivision or development project improvements. The developer (or his duly authorized representative), the developer's engineer, and the designated on-site project manager shall attend this meeting.
C. 
Construction plans. Following the pre-construction meeting, the applicant shall submit two complete sets of construction plans, including profiles, cross-sections, and other working drawings of required construction improvements, to the administrative officer and to the Town's engineer. The approval by the Town's engineer of the construction plans must be given in writing to the administrative officer prior to any construction.
D. 
Notification. No step in the construction of required improvements shall commence until the Town's engineer and administrative officer have been notified, in writing, at least 24 hours, exclusive of Saturday, Sunday and holidays, in advance of the beginning of the step.
E. 
Construction wastes and sanitation. All job sites are required to have a dumpster, or some other method of containing debris, and a portable toilet. Discarded building materials, concrete truck washout, litter, and other debris shall be properly disposed of and removed from the site. Burying or dumping of debris is prohibited. Fuel and oil, if contained on site, shall be properly stored and contained to prevent spills.
F. 
Inspection of improvements.
(1) 
Inspection and written approval by the Town's engineer shall be required at several phases of subdivision improvements, including, but not limited to:
(a) 
Following installation of underground drainage and utilities, prior to backfilling.
(b) 
During preparation of subbase and with grade stakes installed prior to the installation of gravel.
(c) 
Following preparation of the subbase, backfilling and the installation of curbing or shoulders, retaining walls, drainage structures and site grading but prior to application of the base course.
(d) 
Following spreading and compaction of the base course,
(e) 
Immediately prior to and during the application and compaction of the binder and surface course on the roadway and sidewalks.
(f) 
Following completion of improvements and installation of monuments.
(g) 
Immediately prior to and upon completion of any maintenance period.
(2) 
The Town's engineer may require inspection subdivision improvements or development project site improvements at such other intervals as he/she may deem necessary to assure proper construction of improvements, and to ensure compliance with the approved erosion and sediment control plan.
(3) 
Whenever an inspection is required, the developer shall request the Town's engineer to make such inspection. The Town's engineer or his/her representative shall, within 48 hours, exclusive of Saturday, Sunday and holidays, make such inspection. After consultation with the Town Planner, Director of Public Works, Highway Supervisor or other Town official, the Town's engineer shall give to the developer written approval or disapproval of the improvements inspected by him/her. Such written approval or disapproval shall become part of the permanent record for the project. No subsequent step or phase shall commence until an inspection has been made and approval granted.
(4) 
The Town may require inspections on development project sites on an as-needed basis, and a final inspection shall be performed in order to ensure compliance with the approved plans prior to issuance of any certificate of occupancy.
G. 
As-built drawings. Upon completion of the final subgrade and drainage infrastructure, but prior to installation of the binder course of asphalt, the developer shall furnish three sets of certified roadway/subgrade and drainage system as-built drawings to the administrative officer. Upon completion of construction of all required improvements, and before reduction to a maintenance bond, the developer shall furnish to the administrative officer three blue-line sets and one Mylar set of certified final as-built drawings of all improvements. The drawings shall accurately show all features listed below as designed on approved subdivision plans and as actually built and constructed in the field so that all features can be located by public and private agencies.
(1) 
Accurate horizontal and vertical locations of:
(a) 
All roads, walks, and utilities within the street right-of-way (street plan and profile drawn at a scale of one inch equals 40 feet horizontal and one inch equals four feet vertical).
(b) 
All drainage structures, including but not limited to catch basins, retention and/or detention basins, manholes and pipes.
(c) 
All overhead utility poles, or underground power, telephone, cable TV, and fire alarm cables and boxes.
(d) 
All street lines (three-level profile) and spot driveway elevations at street right-of-way lines and at street center lines opposite driveways.
(e) 
All retaining walls, stone walls and other natural or man-made structures, including fire cisterns and dry hydrants.
(f) 
Open space improvements such as trails, ball fields, etc. as required by the Planning Board for conservation design developments.
(2) 
Accurate monumentation.
(a) 
All horizontal changes in direction on both sides of subdivision streets.
(b) 
All lot lines.
(3) 
Plans.
(a) 
Plans must be drawn to scale as required for final subdivision plans, and shall include a title block, revision dates and reference notes.
(b) 
Plans must contain a professional land surveyor's certification that all horizontal and vertical locations are accurate.
(c) 
Plans must contain a professional engineer's certification that all systems, including roads and utilities, will function as designed and constructed.
A. 
Dimensions. Streets constructed within subdivisions shall conform to the requirements listed in Article XIII, § 450-47, and to the cross section shown as Figure 1,[1] unless such requirements are modified by the Planning Board.
[1]
Editor's Note: Figure 1 is included in an attachment to this chapter.
B. 
Clearing and grubbing. The developer shall clear and grub the entire pavement width, plus from the proposed edge of pavement, an additional six feet, as shown on the approved plan. Mature trees shall be left in the area of the balance of the fifty-foot right-of-way, per the direction of the Planning Board. Root systems, trees, stumps, boulders, bushes and other objectionable material shall be removed as determined by the Director of Public Works or Highway Supervisor. Any debris resulting from land development shall be within the authority of this section. Burying of boulders is permissible only with permission of the Planning Board. The preliminary plan shall indicate all proposed areas of burying boulders. The final as-built shall indicate the location where items are buried. Stumps from the public improvements shall not be buried on site.[2]
[2]
Editor's Note: Amended at time of codification.
C. 
Earth excavation. Earth excavation includes, but is not 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 also includes the backfilling of all stump holes and other surface irregularities with suitable fill materials. Excavations shall be to a depth and cross-section as shown on the approved plans, profiles and cross-section drawings.
D. 
Rock and ledge excavation. Rock and ledge excavation includes removal and disposal of all boulders one cubic yard or more in volume (1/2 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 three feet below finished grade, and, where applicable, ledge side slopes shall be four feet vertical to one foot horizontal beyond the right-of-way. Backfilled soil in areas where blasting has occurred must utilize water jetting to reduce the amount of settlement due to fissures created during blasting.
E. 
Subsurface water. Where seasonal high groundwater is encountered within three feet of finished grade, construct adequate drainage at a depth of at least four feet below finished grade. Drainage plans must show proposed outlets for all subdrains. The amount of flow from the subdrain into any designed retention or detention pond shall be calculated and included in the overall calculations for the designed pond.
F. 
Residential street construction. (See Figure 1.[3]) All residential street construction shall conform with Rhode Island Department of Transportation (RIDOT) and AASHTO standards. Should there be a conflict between RIDOT, AASHTO and the standards of this section, the more stringent standard shall control.
(1) 
Materials.
(a) 
Base course. Bank run or processed gravel meeting the following gradation requirements for gravel borrow in the referenced standard: Section M.01.09 Gradation of Aggregates Table 1 Gravel Borrow sieve sizes. A minimum twelve-inch base course is required, provided the top three inches shall be processed gravel of size three-inch minus, while the bottom nine inches may consist of bank run gravel.
(b) 
Binder course. Bituminous concrete (hot mix). Binder course must conform to RIDOT Standard Mix, Section M.03 for Binder Course.
(c) 
Tack coat. Prior to the application of the surface coat, a tack coat of asphalt emulsion shall be applied to the entire binder course. Application of tack coat shall conform with RIDOT Standard Specifications for tack coats.
(d) 
Bituminous surface course. Bituminous concrete (hot mix). Class I-1; must conform to RIDOT Standard Mix, Section M.03.
(e) 
All materials must be of a quality acceptable to the Director of Public Works or Highway Supervisor.
(2) 
General conditions. During construction, the subdivision roads shall be maintained in passable condition and appropriate measures shall be taken to eliminate the creation of a dust nuisance during construction.
(3) 
Construction method.
(a) 
Preparation of subbase. Underground sewer and water lines, utilities, laterals, service lines and related facilities shall be installed prior to any street construction. The subbase shall be thoroughly compacted 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. The subbase shall be cleaned clear of mud, loose and foreign material. Optimum moisture content of subbase shall be determined and achieved before spreading the binder course.
(b) 
Curbs. The edge of the wearing surface shall be held to line and grade by the installation of curbs in accordance with § 450-63, Curbs.
(c) 
Binder course.
[1] 
Standard. After the subbase has been properly prepared and the curbs or shoulders set, the binder course shall be spread for the full road width and in such volume as to provide a 2 1/2-inch cross-section after compaction with a ten-ton roller or the equivalent.
[2] 
Cape Cod berm shall consist of a two-layer base course and integral raised section constructed in conjunction with the wearing surface.
(d) 
Surface course shall be applied 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 applying a leveling course of asphalt. The determination of the need for leveling course, or requiring removal and replacement of a section of binder course with a binder patch, shall be made by the Town engineering consultant. The Town engineering consultant shall give guidance in removing and replacing binder patch, to include, but not limited to: saw cutting around the entire area, removal of existing binder, placement and compaction of gravel base, if needed, use of asphalt tack on joints, and placement of the binder patch.
[2] 
No sooner than 270 days from completion of the binder course, apply surface course at a temperature of 285° F. 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 1 1/2 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-245. Upon completion of the application and compaction of the surface course, allow to stand for a minimum of eight hours without traffic.
(4) 
Traffic limitation. Limit traffic passing over constructed streets to wheeled vehicles, with no tracked equipment permitted.
(5) 
Seasonal limits. Do not install bituminous material when the soil conditions are not suitable or during other unfavorable weather conditions as may be determined by the Director of Public Works or Highway Supervisor. Weather limitations for bituminous plant mix shall not be placed on any wet surface, or when air temperature is below 38° F., or when weather conditions otherwise prevent the proper handling or finishing of the bituminous mixtures.
[3]
Editor's Note: The figures are included as an attachment to this chapter.
A. 
Streets in the proposed subdivision shall be curbed with one of the following types:
(1) 
Rhode Island Standard 7.3.1: quarry-split granite.
(2) 
Cape Cod berm - per typical West Greenwich Cross Section detail (See Figure 1[1]).
[1]
Editor's Note: Figure 1 is included in an attachment to this chapter.
B. 
At street intersections, provide curb returns or shoulders with a radius of at least 25 feet.
C. 
Use appropriate Rhode Island Standard curb shapes for curb transition, inlet and apron installations.
D. 
Install handicapped access transition drops in curbs as directed by the Planning Board. Handicap transitions shall meet all applicable standards, including, but not limited to, the Americans with Disabilities Act, as amended.
E. 
The Planning Board shall require quarry-split granite curbing where necessary to control excessive drainage and runoff caused by steep street slopes.
Construct sidewalks when required, 42 inches wide, in accordance with the sidewalk cross-section as detailed in Figure 1 as follows:[1]
A. 
Materials. Refer to residential street construction material: § 450-62F(1).
B. 
Base course. Compacted depth of six inches.
C. 
Surface course. Compacted depth of 1 1/2 inches.
D. 
Observe same timing of successive steps, use limitations, and surface preparations as outlined for steps of road construction.
[1]
Editor's Note: Figure 1 is included in an attachment to this chapter.
A. 
Earthwork and drainage.
(1) 
Construct surface and subsurface storm drainage structures and facilities to conform to the following sections of the Rhode Island Department of Transportation Standard Specifications for Road and Bridge Construction, exclusive of any items therein covering methods of measurement and basis of payment:[1]
(a) 
Earthwork.
[1] 
Section 203, Structure Excavation and Backfill.
[2] 
Section 204, Trimming and Fine Grading.
[3] 
Section 205, Trench Excavation.
(b) 
Drainage.
[1] 
Section 701, Culverts and Storm Drains.
[2] 
Section 702, Manholes, Inlets, and Catch Basins.
[3] 
Section 703, Underdrains and Combination Drains.
[4] 
Section 711, Paved Waterways.
[1]
Editor's Note: Amended at time of codification.
(2) 
Such standard specifications may be modified at the discretion of the Director of Public Works or Highway Supervisor with the approval of the Planning Board.
B. 
Manholes. Locate manholes on storm sewer trunk lines:
(1) 
At maximum distances of 300 feet;
(2) 
At angles in the sewer lines;
(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.
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 Board 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 or Highway Supervisor.
Install water mains in conformance with the American Water Works Association Standard Specifications and other specifications, as the Kent County Water Authority may require.
A. 
Location: set at every 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 as waived by the Planning Board.
B. 
Materials: actual granite bounds only, conforming in size and shape to the specifications below:
(1) 
Dimensions.
(a) 
At least 30 inches in length and four inches square in cross-section.
(b) 
Place and center on the top surface of the monument a drill hole 1/2 inch in diameter and 3/4 inch deep.
(c) 
Install at points indicated on the final plan.
C. 
Setting monuments: set flush with the ground or the finished grade.
Within 10 feet of adjoining property, limit changes to existing grade to a slope of 2:1, with adequate stabilizing measures. Provide retaining structures to contain slopes that exceed the 2:1 ratio.
Any disturbance to an existing asphalt street, including, but not limited to, installation of public water, public sewers or natural gas, shall require the repaving of an area not smaller than six feet on both sides of the edges of the disturbed area, said repaving to be from curb to curb. The intent of this section is to create areas of transition over disturbed areas of asphalt, rather than a depressed area or cut area of a few feet in width, deemed to be a safety hazard to drivers.